methods of cementing a tubular column in a well, an underwater well and a well that extends from a w

专利摘要:
CONTROLLED PRESSURE CEMENTATION. The present invention relates to a method of cementing a tubular column in a well that includes: positioning the tubular column in the well, pumping the cement paste into the tubular column, launching a cement plug after pumping the cement paste, pushing the cement plug through the tubular column, thus pumping the cement paste through the tubular column and into an annular crown formed between the tubular column and the well; and controlling the flow of fluid displaced from the well through the cement paste to control the pressure of the annular crown.
公开号:BR102012029292B1
申请号:R102012029292-0
申请日:2012-11-16
公开日:2020-12-15
发明作者:Don M. Hannegan；Cesar Pena；David Pavel；Michael Brian Grayson；Said Boutalbi；Todd Douglas Cooper；Timothy P. Dunn；Frank Zamora Jr
申请人:Weatherford Technology Holdings, Llc；
IPC主号:

专利说明:

BACKGROUND OF THE INVENTION
Embodiments of the present invention relate, in general, to controlled pressure cementation. DESCRIPTION OF RELATED TECHNIQUE
In well construction and completion operations, a well is formed to access formations containing hydrocarbons (for example, crude oil and / or natural gas) with the use of drilling. Drilling is performed using a drill that is mounted on the end of a drill string. To drill into the well to a predetermined depth, the drill string is usually rotated by an upper unit or rotary table on a platform or surface equipment, and / or by a downhole motor mounted towards the lower end of the string. drilling. After drilling to a predetermined depth, the drill string and drill bit are removed and a section of the liner is lowered into the well. An annular crown is thus formed between the coating column and the formation. The casing column is suspended from the wellhead. A cementing operation is then carried out in order to fill the annulus with cement. The lining column is cemented in the well with the circulation of cement to the annular crown defined between the outer wall of the lining and the borehole. The combination of cement and coating reinforces the well and facilitates the isolation of certain areas of the formation behind the coating for the production of hydrocarbons.
Once the initial or surface coating has been cemented, the well can be extended and another column of liner or jacket can be cemented into the well. This process can be repeated until the well intersects the formation. Once the formation has been produced and exhausted, cement plugs can be used to abandon the well. If the well is exploratory, tests can be carried out, and the well can then be abandoned.
Not all wells that are drilled and casing columns cemented in place during well operation are problematic. In contrast, the primary cementation of problematic wells has historically proved to be inefficient and not obtainable by manipulating traditional variables. What can be recorded today to effectively measure the success or failure of a primary cementation is not suitable for cementing problematic wells. Understanding the objectives of primary cementation, with primary cementation being able to be carried out and the results properly interpreted, has basically been the criterion of success or failure. Whether success is a current leakage test, an open hole bypass plug, isolation of a hydrocarbon-containing zone of interest, or a freshwater zone that has to be hydraulically or mechanically isolated and protected, the tools and methods that operators and service companies currently employ that can be controlled and monitored are not always sufficient to provide the results neither expected nor desired. SUMMARY OF THE INVENTION
Embodiments of the present invention relate, in general, to controlled pressure cementation. In one embodiment, a method of cementing a tubular column in a well includes placing the tubular column in the well, pumping the cement paste into the tubular column, casting a cement plug after pumping the cement paste, propelling the cement plug through from the tubular column, thus pumping the cement paste through the tubular column and into an annular crown formed between the tubular column and the well, and control the flow of fluid displaced from the well through the cement paste to control the pressure of the annular crown.
In another embodiment, a method of cementing a tubular column in a well includes positioning the tubular column in the well, the tubular column including one or more cement sensors, pumping the cement paste into the tubular column, casting a cement plug after pumping of the cement paste, prevent the cement plug through the tubular column, thus pumping the cement paste through the tubular column and into an annular crown formed between the tubular column and the well, and analyze the data from the cement sensors during curing of the cement paste.
In another embodiment, a method of cementing a tubular column in an underwater well includes positioning the tubular column in the underwater well, pumping cement paste into the tubular column, launching a cement plug after pumping the cement paste, propelling the cement plug through the tubular column using a chase fluid (also known as displacement), thereby pumping the cement paste through the tubular column and into an annular crown formed between the tubular column and the well, measuring a flow rate of the chase fluid, and measuring a flow rate of fluid displaced from the well with the displacement of fluid displaced from a bore in a pressure control assembly connected to an underwater wellhead in the subsea well through a subsea flow meter in the pressure control assembly.
In another embodiment, a method for drilling a well includes drilling the well by injecting drilling fluid into the top of a drilling column disposed in the well at a first flow rate and turning a drill. The drilling fluid comes out of the bit and conducts drill cuttings. The cuttings and drilling fluid (returns) flow from the drill bit through an annular crown defined between the tubular column and the well. A seal from a rotary control device is engaged with the drill string and deflects the returns to an outlet of the rotary control device. The method additionally includes, while drilling the well, to throttle the flow of returns in such a way that a downhole pressure corresponds to a target pressure, where the target pressure is greater than or equal to a pore pressure and less than one fracture pressure of an exposed formation adjacent to the well, increase the strangulation of the returns in such a way that the bottom pressure corresponds to an expected pressure during the cementation of the exposed formation, and, while increasing the return strangulation, measure the first flow rate, measure a flow rate of returns, and compare the flow rate of returns to the first flow rate to ensure the integrity of the exposed formation. BRIEF DESCRIPTION OF THE DRAWINGS
In order that the manner in which the characteristics of the present invention mentioned above can be understood in detail, a more specific description of the invention, briefly summarized above, can be achieved with reference to the embodiments, some of which are illustrated in the accompanying drawings. It should be noted, however, that the attached drawings illustrate only typical embodiments of this invention and should therefore not be considered to limit its scope, so that the invention can be admitted to other equally effective embodiments.
Figure 1 illustrates a terrestrial drilling system in a coating cementation mode, according to an embodiment of the present invention.
Figures 2A-2G illustrate a coating cementing operation performed using the drilling system.
Figure 3A illustrates the operation of a programmable logic controller (PLC) of the drilling system during the coating cementing operation. Figure 3B illustrates the monitoring of the cementing operation. Figure 3C illustrates the detection of formation inflow during cementation. The 3D figure illustrates the detection of cement loss during cementation. Figure 3E illustrates the monitoring of cement paste curing and the application of a beneficial amount of back pressure on the annular crown. Figure 3F illustrates the detection of formation influx during curing. Figure 3G illustrates the detection of cement loss during curing.
Figures 4A and 4B illustrate a portion of the drilling system in a liner cementation mode, according to another embodiment of the present invention. Figure 4C illustrates the operation of cement sensors.
Figures 5A-5F illustrate a jacket cementing operation performed using the drilling system.
Figure 6 illustrates the operation of the PLC during the jacket cementing operation.
Figures 7A-C illustrate an offshore drilling system in a drilling mode, according to another embodiment of the present invention. Figure 7D illustrates a dynamic formation integrity test performed using the drilling system. Figures 7E and 7F illustrate the cement cure monitoring of an underwater coating cementing operation conducted using the drilling system.
Figure 8A illustrates the cement cure monitoring of an underwater coating cementation operation conducted using a second offshore drilling system, according to another embodiment of the present invention. Figures 8B and 8C illustrate an underwater coating cementation operation conducted using a third offshore drilling system, according to another embodiment of the present invention.
Figures 9A and 9B illustrate the monitoring of the cement cure of an underwater coating cementing operation conducted using a fourth offshore drilling system, according to another embodiment of the present invention. Figures 9C and 9E illustrate a wireless cement sensor sub of an alternative internal lining column that is cemented. Figure 9D illustrates a radio frequency identification (RFID) tag for communication with the sensor sub. Figure 9F illustrates the fluid handling system of the drilling system.
Figures 10A-10C illustrate a corrective cementing operation that is performed using an alternative coating column, according to another embodiment of the present invention.
Figures 11A-11C illustrate a corrective compression operation that is performed using the alternative coating column, according to another embodiment of the present invention. DETAILED DESCRIPTION
Figure 1 illustrates a terrestrial drilling system 1 in a coating cementation mode, according to an embodiment of the present invention. The drilling system 1 can include a drilling rig 1r, a fluid handling system 1f, and a pressure control assembly (PCA) 1p. The drilling rig 1r may include a tower 2 having an equipment floor 4 at its lower end having an opening 6 through which a casing adapter 7 extends downwardly to PCA 1p. PCS 1p can be connected to a wellhead 21. Wellhead 21 can be mounted on an outer casing column 101 that has been deployed into a well 100 drilled from a surface 104s of the earth and cemented 102 into the well. The casing adapter 7 may include a sealing head (not shown) for engaging an inner casing column 105 which has been deployed in the well 100 and which is ready to be placed in place. The casing adapter 7 can also be connected to a cementing head 10. The cementing head 10 can also be connected to a Kelly 11 valve via a spool 17. The Kelly 11 valve can be connected to a hollow shaft in a upper unit 12. The upper unit 12 may include a motor for rotating a drill string. The motor of the upper unit can be electric or hydraulic. A housing of the upper unit 12 can be coupled to a rail (not shown) of the tower 2 to prevent the rotation of the housing of the upper unit during the rotation of the drill string and to allow the vertical movement of the upper unit with a catarina 13. A housing of the upper unit 12 can be suspended from the tower 2 by the catarina 13. The catarina 13 can be supported by steel cable 14 connected at its upper end to a crown block 15. The steel cable 14 can be woven through the pulleys of the blocks 13, 15 and extends to the winch 16 for winding it up, thus raising or lowering the catarina 13 in relation to the tower 2.
Alternatively, the well may be submarine with a wellhead located adjacent to the waterline and the drilling rig may be located on a platform adjacent to the wellhead. Alternatively, a Kelly and a rotary table (not shown) can be used in place of the upper unit.
The cementation head 10 can include one or more buffer launchers 8u, b, and a collector 18. The cementation collector 18 can include a trunk and one or more branches, such as three. Each branch may include a 9u, m, b shut-off valve to provide selective fluid communication between the manifold trunk and launchers 8u, b. Each launcher 8u, b can include a container for housing a respective cementation plug, such as cleaner 125u, b (figures 2B and 2C), and operable coupling or check valve to selectively retain the respective cleaner in the launcher. A lower branch featuring valve 9b can connect the header of the collector directly to the casing adapter 7, thereby bypassing launchers 8u, b. An intermediate branch featuring the 9m valve can connect the trunk between launchers 8u, b to position a lower wiper 125. An upper branch featuring the 9u valve can connect the trunk above an upper launcher 8u to position an upper cleaner 125u.
PCA 1p may include a burst safety system (BOP) 20, a rotary control device (RCD) 22, and a variable throttle valve 23. A BOP 20 housing can be connected to wellhead 21, such as through a connection provided with flanges. The BOP housing can also be connected to an RCD 22 housing, such as via a connection provided with a flange. RCD 22 may include a withdrawable seal and housing. Removable sealing can be supported for rotation with respect to the housing by means of bearings. The withdrawable-housing seal interface can be isolated by seals. The withdrawable seal can form a forced fit with an outer surface of the casing adapter 7 and be directional to increase by well pressure. Alternatively, the withdrawable seal may be an inflatable bladder or a lubricated plug assembly. Alternatively, a shutter or BOP can be used in place of the RCD.
The choke 23 can be connected to an outlet port 21o (figure 3B) of the wellhead 21. The choke 23 can be strengthened to operate in an environment where the return fluid may include solids, such as gravel. The choke 23 may include a hydraulic actuator operated by a programmable logic controller (PLC) 25 via a hydraulic power unit (HPU) (not shown) to maintain pressure (figure 3A) at the wellhead 21. Alternatively, the Choke actuator can be electric or pneumatic.
The outer casing column 101 can extend to a depth adjacent to a bottom of an upper formation 104u and the inner casing column 105 can extend to a portion of the well 100 that crosses a lower formation 104b. The upper formation 104u may be non-productive and the lower formation 104 may be a hydrocarbon-containing reservoir. Alternatively, the lower formation 104b may be environmentally sensitive, such as an aquifer, or unstable. The inner lining column 105 can include a plurality of lining joints 106 connected together, such as by means of threaded connections, one or more centralizers 107 spaced along the lining joints at regular intervals, a float collar 108, a guide shoe 109, and a coating hanger 24. Each coating joint 106 can be formed of a metal or alloy, such as steel or stainless steel. Centralizers 107 can be fixed or spring-loaded. The centralizers 107 can engage an internal surface of the outer liner 101 and / or of the well 100. The centralizers 107 can be operated to center the inner liner 105 in the well 100.
The shoe 109 can be arranged at the bottom end of the coating column 105 and have a hole formed through it. The shoe 109 can be convex to guide the casing column 105 towards the center of the well 100. The shoe 109 can minimize the problems associated with impacting rock layers or bumps in the well 100 as the casing column 105 is lowered. in the well. An external portion of the shoe 109 can be formed from a coating material, discussed above. An inner portion of the shoe 109 may be formed of a perforable material, such as cement, cast iron, metal or non-ferrous alloy, or polymer, so that the inner portion can be drilled, if well 100 is further drilled. Float collar 108 may include a check valve to selectively seal the shoe hole. The check valve can be operable to allow fluid to flow from the casing hole to well 100 and prevent reverse flow from the well to the casing hole.
The fluid system 1f may include one or more pumps 30a, m, c, a reservoir of drilling fluid, such as a pit 31 or a tank, a degassing spool (not shown, see degassing spool 230 in figure 7A) , a solids separator, such as a mud sieve 33, one or more flow meters 34a, m, c, r and one or more pressure sensors 35a, m, c, r. Each pressure sensor 35a, m.c.r can be in data communication with the PLC 25. The pressure sensor 35r can be connected between the choke 23 and the outlet port 21o and can be operable to monitor the well pressure. The pressure sensor 35a can be connected between a ring pump 30a and the inlet port 21i of the wellhead 21 and can be operable to monitor a discharge pressure from the ring pump. The 35m pressure sensor can be connected between a 30m mud pump and a cane tube (not shown) connected to an inlet of the upper unit 12 and can be operated to monitor the cane tube pressure. The pressure sensor 35c can be connected between a cement pump 30c and the cementation collector 18 and can be operable to monitor the pressure of the collector.
The return flow meters 34r and cement 34c can each be a mass flow meter, such as a Coriolis flow meter, and can each be in data communication with the PLC 25. The meter cement flow rate 35c can be connected between cement pump 30c and cementation collector 18 and can be operable to monitor a flow rate of the cementation pump. The return flow meter 34r can be connected between the choke 23 and the mud screen 33 and can be operable to monitor a return fluid flow rate. The supply flow meters 34m and annular crown 34a can each be a volumetric flow meter, just like a Venturi flow meter and can each be in data communication with the PLC 25. The crown flow meter 34a can be connected between the crown pump 30a and the inlet port 21i and can be operable to monitor a flow rate of the crown pump. The PLC 25 can receive an indicator fluid density measurement 130i (figure 3E) from an indicator fluid mixer (not shown) to determine a mass flow rate of the indicator fluid from the volumetric measurement of the supply flow meter 34d. The 35m supply flow meter can be connected between a 30m mud pump and the cane tube and can be operable to monitor a mud pump flow rate. PLC 25 can receive a 130m drilling fluid density measurement (figure 2A) from a mud mixer (not shown) to determine a drilling fluid mass flow rate from the volumetric measurement of the 34d supply flow meter.
Alternatively, a stroke counter (not shown) can be used to monitor a flow rate for each pump 30a, m.c instead of the respective flow meters. Alternatively, annular crown flow meters 34a and / or supply 34m can be mass flow meters. Alternatively, the cement flow meter 34c can be a volumetric flow meter.
In drilling mode (not shown, see figure 7A), as well as extending well 100 of a casing shoe 101 to a depth to position casing 105, the mud pump 30m can pump drilling fluid 130m from the pit 31, through the cane tube and a Kelly hose to the upper unit 12. Drilling fluid 130m can include a base liquid. The base liquid can be refined oil, water, brine, or a water / oil emulsion. The drilling fluid 130m can additionally include solids dissolved or suspended in the base liquid, such as organophilic clay, lignite, and / or asphalt, thus forming a sludge. Alternatively, the drilling fluid 130m can additionally include a gas, such as diatomic nitrogen mixed with the base liquid, thus forming a two-phase mixture. If the 130m drilling fluid is two-phase, drilling system 1 may additionally include a nitrogen production unit (not shown) operable to produce commercially pure nitrogen from the air. 130m drilling fluid can flow from the cane tube and to a drilling column (not shown, see drilling column 207 in figures 7A-7C) via the upper unit 12. Drilling fluid 130m can be pumped through the drilling column and out of a drill, where the fluid can circulate the cuttings away from the drill and return the cuttings to an annular crown formed between an inner surface of the liner 101 or well 100 and an outer surface of the drill string. The returns (drilling fluid plus cuttings) can flow from the annulus to the wellhead 21 and be diverted by RCD 22 to the wellhead outlet 21o. Returns can continue through throttle 23 and flow meter 34r. The returns can then flow to the mud sieve 33 and be processed to remove the cuttings, thus completing a cycle. As the drilling fluid 130m and the returns flow, the drilling column can be rotated by the upper unit 12 and lowered by the catarina 13, thus extending the well 100 to the lower formation 104b.
During drilling, PLC 25 can perform a mass balance between drilling fluid 130m and returns to monitor the forming fluid that enters the annulus or the drilling fluid that enters the formation using the flow meters 34m, r . The PLC 25 can then compare the measurements to detect the ingress of the formation fluid or the exit of the drilling fluid can take corrective action with the adjustment of the choke 23 (a certain ingress can be tolerated for the underbalanced drilling).
Once well 100 has been drilled to a depth sufficient to accommodate outer casing 105, the drill string can be recovered on surface 104s. The outer casing 105 can be mounted or unfolded in the well 100. Alternatively, the casing 105 can be drilled in the well instead of using the wellhead. Once the liner 105 has been deployed in the well 100 and the liner hanger 24 is placed on the wellhead 21, the liner adapter 7 can be engaged with the liner hanger 24. The cement head 10 can be connected to the adapter cladding unit and upper unit 12. A cement mixer, such as a recirculating mixer 36, a cement pump 30c, and a cementing conduit can be connected to the collector trunk.
Figures 2A-2G illustrate a coating cementing operation performed using drilling system 1. A conditioning fluid 130w can be circulated by the cement pump 30c through the lower collector valve 9b. Conditioner 130w can level drilling fluid 130m from well 100, washing gravels and / or the mud cake from the well, and / or adjust the pH in the well to pump cement paste 130c. The lower manifold valve 9b can then be closed. The lower cleaner 125b can be released from the lower launcher 8b and the intermediate collector valve 9m can be opened. The cement paste 130c can be pumped from the mixer 36 to the intermediate collector valve 9m by the cement pump 30c, thus driving the bottom cleaner 125b into a hole in the liner 105. As the bottom cleaner 125b is fired through the casing hole, the bottom cleaner may move conditioner 130w from casing hole to an annular crown 110 formed between an outer surface of casing 105 and an inner surface of well 100 (or the existing casing 101). The bottom cleaner 125b can also protect cement paste 130c from dilution by conditioner 130w.
Once the desired amount of cement paste 130c has been pumped, and the intermediate collector valve 9b can be closed, the upper cleaner 125u can be released from the upper launcher 8u, and the upper collector valve 9u can be opened. The displacement fluid (also known as chase) 130d can be pumped from the mud pit 31 to the upper collector valve 9u by the cement pump 30c, thereby driving the upper cleaner 130u into the casing hole.
The displacement fluid 130 may have a density less or substantially less than the cement paste 130c, so that the coating 105 remains in compression during the curing of the cement paste. The displacement fluid 130d can be drilling fluid.
The pumping of displacement fluid 130d by the cement pump 30c can continue until residual cement in the cement discharge line has been purged. The pumping of displacement fluid 130d can then be transferred to the mud pump 30m by closing the upper collector valve 9u and opening the Kelly 11 valve. As the upper cleaner 125u is driven through the casing hole , the bottom cleaner 125b can be placed on the float collar 108. Continued pumping of the displacement fluid 130d can put pressure on the bottom cleaner 125b until a diaphragm breaks. The rupture of the diaphragm can open a flow passage through the lower wiper 125b and the cement paste 130c can flow through the passage and the float valve and to the annular crown 110. The pumping of the displacement fluid 130d can continue until the upper wiper 130u is placed on the lower wiper 130b. The placement of the upper cleaner 130u can increase the pressure in the casing hole and be detected by the PLC 25 that monitors the cane tube pressure. Once the placement has been detected, pumping displacement fluid 130d can be stopped and pressure in the casing hole can be bled. The float valve can be closed, thereby preventing cement paste 130c from flowing back into the casing hole above float collar 108 (also known as U tubes).
Alternatively, instead of placing the coating hanger 24 on the wellhead 21 before the cementing operation, the upper unit 12 can suspend the coating 105 so that the hanger is above the wellhead, so that the coating can be alternated by winch 16 and / or rotated by the upper unit during the cementing operation. In this alternative, the collector 18 can include a flexible conduit to accommodate the reciprocating movement and / or the cementation head 10 can include one or more cement injection heads to accommodate the rotation. Alternatively, the spacer fluid (not shown) can be pumped between the cement paste 130c and the lower cleaner 125b.
Figure 3A illustrates the operation of PLC 25 during the coating cementing operation. Figure 3B illustrates the monitoring of the cementing operation. Figure 3C illustrates the detection of formation inflow during cementation. The 3D figure illustrates the detection of cement loss during cementation.
The PLC 25 can be programmed to operate the throttle 23, so that a target downhole pressure (BHP) is maintained in the annular crown 110 during the cementing operation. The target BHP can be selected to be within a window defined as greater than or equal to a minimum limit pressure, such as pore pressure, of lower formation 104b and less than or equal to a maximum limit pressure, such as fracture pressure, of the inferior formation, such as an average of the pore and fracture BHPs. Alternatively, the lower limit may be stability pressure and / or the upper limit may be leakage pressure. Alternatively, limit pressure gradients can be used instead of pressures and gradients can be at other depths along the lower formation 104b in addition to the total depth, such as the depth of the maximum pore gradient and the depth of the minimum fracture gradient. . Alternatively, PLC 25 may be free to vary the BHP within the window during the cementing operation.
During the cementing operation, the PLC 25 can perform a real-time simulation of the cementing operation in order to predict the effective BHP of the measured data, such as the pressure of the 35c sensor collector, the cement pump flow rate of the flow meter 34c, the wellhead pressure of the sensor 35r, and the flow rate of returns of the flow meter 34r. The PLC can then compare the expected BHP to the target BHP and adjust the strangle accordingly. In the initial stages of the cementation operation (figures 2A-2C), the ring crown 110 can be filled with conditioner 130w with an equivalent circulation density (ECD) Wd (static density plus drag by dynamic friction). The ECD conditioner Wd may be smaller or substantially less than an ECD Cd of cement 130. The ECD conditioner Wd may also be insufficient to maintain the target BHP without the addition of the choke back pressure 23.
A static density Cs of cement 130c can be selected to exert a BHP corresponding to the target BHP at the completion of the cementation operation. As the cement flows into the annular crown 110 (figure 2E), the effective BHP may begin to be influenced by the Cd Cd of the cement (also known as the double gradient effect). PLC 25 can predict the double gradient effect on the predicted BHP and reduce back pressure according to the relaxation of the choke 23. PLC 25 can continue to relax the choke 23 insofar as a CL level of cement in the annular crown 110 increases and the influence of ECD Cd cement on BHP increases to maintain parity of the actual / expected BHP with the target BHP.
The PLC 25 can also perform a mass balance during the cementing operation. Although figures 3B-3D illustrate PLC 25 performing mass balance while moving cement paste 130c to annular crown 110, the PLC can also perform mass balance during the rest of the cementation operation, such as during conditioning and driving the lower cleaner 125b with the pumping of the cement paste. As the propellant (displacement fluid 130d shown) is being pumped into well 100 by the mud pump 30m (or cement pump 30c) and the return fluid (conditioner 130w shown) is being received through the head outlet. well 21o, PLC 25 can compare the propellant mass flow rate to the return fluid flow rate (i.e., the propellant rate minus the return fluid rate) using the flow meters 34m, r (or 34c, r).
PLC 25 can use mass balance to monitor the formation of fluid 130f that enters annular crown 110 (figure 3C) or cement paste 130c (or return fluid) that enters formation 104b (figure 3D). With the detection of each event, the PLC 25 can take corrective action, such as compressing the choke 23 in response to the detection of forming fluid 130 f entering the annular crown 110 and relaxing the choke in response to the incoming cement 130c in formation 104b. The PLC 25 can also alert an operator to reduce a flow rate of the respective pump and reduce the target BHP in response to the detection of fluid egress in the formation. The PLC 25 can also alert the operator to increase the flow rate of the respective pump and increase the target BHP in response to the detection of fluid ingress in the annular crown. Alternatively, PCL 25 can be in communication with one or more pumps and the PLC can take corrective action autonomously or semi-autonomously. The PLC 25 can also divert the return formation fluid to the degassing spool as part of the corrective action.
PLC 25 can also use flow meters 34r, c, m to calculate the level of cement CL in the annular crown. PCL 25 can consider the egress of cement paste when calculating the cement level. The PLC 25 can also use the flow meters 34r, c, m to calculate other events during the cementing operation, such as settling the cleaners 125u, b, and / or completing the circulation of conditioner (annular ring 110 filled with conditioner 130w).
Figure 3E illustrates the monitoring of cement paste 130c curing and the application of a beneficial amount of back pressure to annular crown 110. Figure 3F illustrates the detection of formation influx during curing. Figure 3G illustrates the detection of cement loss during curing. Once the casing hole has been bled, the annular crown pump 30a can be operated to pump the indicator fluid 130i from the pit 31 to the inlet port 21i. Indicator fluid 130i can flow radially through wellhead 21 and out of wellhead 21 into outlet port 21o. The path of the indicator fluid may be in communication with the annular crown 110, thus forming a T with the annular crown as a stagnant branch. Indicator fluid 130i can continue through choke 23, return flow meter 34r, and through mud screen 33 and back to mud pit 31. Circulation of indicator fluid 130i can be maintained during the curing period. As the indicator fluid 130 is being circulated, the PLC 25 can perform a mass balance between the input and output of the indicator fluid to / from the wellhead 21 to monitor the forming fluid 130f entering the annular crown 119 (figure 3F) or cement paste 130 entering formation 104b (figure 3G) using flow meters 34a, r. PLC 25 can compress the choke 23 in response to the detection of forming fluid 130f entering the annular crown 110 and relaxing the choke in response to cement paste 130c entering formation 104b. The PLC 25 can also divert the return fluid flow to the degassing spool in response to the detection of each event.
PLC 25 can also be programmed to distinguish between the forming fluid 130f which continuously flows into the annular crown 110 or the cement 130c which continuously flows into the formation 104b and which opens or closes the microfractures in the formation during cementation and / or cure (also known as inflation) by calculating and monitoring a rate of change in mass balance with respect to time (delta balance) and comparing the delta balance to a predetermined limit.
The PLC 25 can maintain a cumulative record during the cementing and curing operation of any fluid ingress / egress events, discussed above, and the PLC can have an assessment regarding the acceptability of the Kurdish cement bond. PLC 25 can also determine and include the final cement level CL in the assessment. If PLC 25 determines that the cured cement is unacceptable, the PLC may make recommendations for corrective action, such as a cement bond / assessment record and / or a secondary cementation operation.
Figures 4A and 4B illustrate a portion of the drilling system 1 in a liner cementation mode, according to another embodiment of the present invention. A well 150 may include a vertical portion and an offset portion, such as horizontal, instead of vertical well 100. Well 150 may be onshore or submarine. A cementing head 50 can be used instead of cementing head 10 and a working column 57 can be used instead of casing adapter 7. Working column 57 can include pipe joints, such as drill pipe 57p, connected to each other, such as threaded connections, a 57h sealing head, and a 57s adjustment tool. The adjustment tool 57s can connect a jacket column 155 to the working column 57. The working column 57 can also be connected to the cementing head 50. The cementing head 50 can also be connected to the Kelly 1 valve.
The cementation head 50 may include an actuator injection head 51a, a cementation injection head 51c, and a launcher 58. Each injection head 51a, c may include a housing torsionally connected to tower 2, such as by bars, steel cable, or an arm (not shown). Each torsional connection can accommodate the longitudinal movement of the respective injection head 51a, c with respect to the tower 2. Each injection head 51a, c can additionally include a mandrel and bearings to support the housing from the mandrel while accommodating the relative rotation between the same. The cementation injection head 51a may additionally include an inlet formed through a housing wall and in fluid communication with an orifice formed through the mandrel and a seal assembly to isolate the inlet communication. The cement injection head inlet can be connected to the cement pump 30c by means of the shut-off valve 59. The shut-off valve 59 can be automated and have a hydraulic actuator (not shown) operable by the PLC 25 by means of fluid with the HPU. Alternatively, the shutoff valve actuator can be pneumatic or electric. The cementing mandrel orifice can provide fluid communication between a cementation head hole 50 and the housing inlet. Each seal assembly may include one or more stacks of V-shaped o-rings, such as opposing stacks, arranged between the mandrel and the housing and extending over the inlet port interface. Alternatively, the seal assembly may include rotary seals, such as mechanical face seals.
The actuator injection head 51a can be hydraulic and can include a housing inlet formed through a housing wall and in fluid communication with a passage formed through the mandrel, and a seal assembly to isolate the inlet communication. . The passage may extend to a mandrel outlet for connection to a hydraulic conduit to operate a hydraulic actuator 58a from the cementing head 10. The actuator injection head 51a may be in fluid communication with the HPU. Alternatively, the actuator injection head and the cementation head actuator can be pneumatic or electric. The Kelly 11 valve can also be automated and include a hydraulic actuator (not shown) operable by the PLC 25 through fluid communication with the HPU. The cementing head 50 can additionally include an additional actuator injection head (not shown) for operation of the Kelly valve 11 or the upper unit 12 can include the additional actuator injection head Alternatively, the Kelly valve actuator can be electric or pneumatic.
Launcher 58 may include a housing 58h, a diverter 58d, a container 58c, a latch 58r, and actuator 58a. The housing 58h may be tubular and may have a hole through it and a coupling formed at each longitudinal end thereof, such as threaded couplings. Alternatively, the upper housing coupling can be a flange. To facilitate assembly, housing 58h may include two or more sections (three shown) connected together, such as by a threaded connection. Housing 58h may also serve as a cement injection head housing (shown) or the cementation injection launcher or head 51c may have separate housing (not shown). The housing 58h may additionally have a placement shoulder 58s formed on an internal surface thereof. The container 58c and the diverter 58d can each be arranged in the housing hole. The diverter 58d can be connected to the housing 58h, such as by a screw connection. The container 58c can be longitudinally movable with respect to the housing 58h. The container 58c can be tubular and have ribs formed along and around an external surface thereof. Bypass passages can be formed between the ribs. The container 58c may additionally have a placement shoulder formed at a lower end thereof corresponding to the housing placement shoulder 58s. The diverter 58d may be operable to deflect the cement paste 130c or the displacement fluid 130d away from a hole in the container and in the direction of the bypass passages. A cementation plug, such as dart 75, can be arranged in the container hole for selective loosening and downhole pumping to activate a cementation plug, such as cleaner 175, loosely connected to the adjustment tool 57s.
The hitch 58r may include a body, a plunger, and an axle. The body can be connected to a vane formed on an outer surface of the launcher housing 58h, such as a threaded connection. The plunger can be longitudinally movable with respect to the body and radially movable with respect to the 58h housing between a capture position and a release position. The plunger can be moved between positions by interaction, such as a screw jack, with the shaft. The shaft can be longitudinally connected to the body and rotatable with respect to it. Actuator 58a can be an operable hydraulic motor to rotate the shaft with respect to the body. Alternatively, the actuator can be linear, such as a piston and a cylinder. Alternatively, the actuator can be electric or pneumatic. Alternatively, the actuator can be manual, such as a steering wheel.
In operation, PLC 25 can release dart 75 in operating the HPU to supply hydraulic fluid to actuator 58a through an actuator injection head 51a. Actuator 58a can then move the plunger to the release position (not shown). The container 58c and the dart 75 can then be moved downwardly with respect to the housing 58h until the placement lugs 58s are engaged. The engagement of the placement lugs 58s can close the bypass passages of the container, thus forcing the displacement fluid 130d to flow into the container bore.
The displacement fluid 130d can then propel the dart 75 from the container hole to a lower hole in the housing 58h and out through the drill pipe 57p to the cleaner 175.
In addition, the cementation head 50 may additionally include a launch sensor (not shown). The launch sensor can be in data communication with the PLC 25 via an additional injection head (not shown). The dart can include a radio frequency or magnetic tag and the launch sensor can include a receiver or a transceiver to interact with the dart tag, thereby detecting the release of the dart. The launch sensor can report launch detection to PLC 25.
Alternatively, the launcher may include a main body having a main hole and a parallel side hole, with both holes being machined integral with the main body. Dart 75 can be loaded into the main hole, and the dart release valve can be provided below the dart to keep it in the capture position. The data release valve can be mounted on the side externally and extends through the main body. A hole in the dart release valve can provide fluid communication between the main hole and the side hole. When pumping cement paste 130c, dart 75 can be kept in the main hole with the dart release valve closed. The paste 130c can flow through the side hole and into the main hole below the dart through the fluid communication port to the dart release valve. To release the dart 75, the dart release valve can be generated, such as at ninety degrees, thereby closing the side hole and opening the main hole through the dart release valve. The displacement fluid 130d can then enter the main hole behind the dart, causing it to be dropped downwards.
To facilitate the removal of the drill string and the deployment of the jacket string 155, the outer liner 101 may include an isolation valve 140. Isolation valve 140 may include a tubular housing, a flow tube (not shown), and a closing member, such as a tongue 140f. Alternatively, the closing member can be a sphere (not shown) instead of the tongue. To facilitate manufacturing and assembly, the housing may include one or more sections connected together, such as fastened with threaded connections and / or fasteners. The housing may have a longitudinal hole formed through it for the passage of a tubular column. The flow tube can be arranged inside the housing. The flow tube can be longitudinally movable with respect to the housing. A piston (not shown) can be formed on an external surface of the flow tube or attached to it. The flow tube can be longitudinally movable by the piston between the open position and the closed position. In the closed position, the flow tube can be free of the tongue 140f, thus allowing the tongue to be closed. In the open position, the flow tube can engage tongue 140f, push the tongue into the open position, and engage a seat formed in or arranged in the housing. The engagement of the flow tube with the seat can form a chamber between the flow tube and the housing, thus protecting the tongue 140f and the tongue seat. The tongue 140f can be pivoted to the housing, such as by a fastener 140p. A pressing member, such as a torsion spring (not shown) can engage tongue 140f and housing and be arranged around fastener 140p to press the tongue in the closed position. In the closed position, tongue 140f can fluidly isolate an upper portion of valve 140 (and an upper portion of well 150) from a lower portion of valve (and formation 104b).
The valve 140 can be in communication with the PLC 25 via a control line 142. The control line 142 can include hydraulic ducts providing fluid communication between the HPU and the flow tube piston to open and close the valve 140. The control line 142 can additionally include a data line to provide data communication between the PLC 25 and valve 140. The control line data line can be electrical or optical. The valve 140 may additionally include a cable head 141h for receiving the control line cable.
Valve 140 may additionally include one or more sensors, such as an upper pressure sensor 141u, a lower pressure sensor 141, and a position sensor 141p. The upper pressure sensor 141u may be in fluid communication with the housing hole above the tongue 140f and the lower pressure sensor 141b may be in fluid communication with the housing hole below the tongue. Lead wires can provide data communication between control line 142 and sensors 141u, b, p. The 141p position sensor can detect when the flow tube is in the open position, in the closed position, or in any position between the open and closed positions, so that the PLC 25 can monitor the total or partial opening of the valve 140. The sensors can be energized via the data line of control line 142 or valve 140 can include a battery pack.
The liner column 155 can include a plurality of liner junctions 106 connected together, such as by threaded connections, one or more centerers 107 spaced along the liner column at regular intervals, a collar collar 158, a float shoe 159, a jacket hanger 160, one or more cement sensors 161a-f, and a wireless data coupling 162i. The shoe 159 can be arranged at the lower end of the joints 160 and have a hole formed between them. The shoe 159 can be convex to guide the jacket column 155 towards the center of the well 150. An outer portion of the shoe 159 can be formed from the lining material, discussed above. An inner portion of the shoe 159 can be formed of perforable material, discussed above. The shoe 159 may include the check valve, discussed above.
The shirt hanger 160 may include an anchor 160a and a packing 160p. Anchor 160a can be operable to engage the liner 101 and longitudinally support the liner column 155 from the liner 101. Anchor 160a can include serrated wedges and a cone. Anchor 160a can accommodate a relative rotation between the jacket column 155 and the liner 101, such as including a bearing (not shown). The 160p packing can be operable to radially expand to
engaging with an inner surface of the liner 101, thereby isolating the jacket-liner interface. The 57s adjustment tool can be operable to adjust the anchor and packing independently. The adjustment tool 57s can include a seat for receiving a locking member, such as a ball (not shown). The cementing head 50 may additionally include an additional launcher (not shown) to position the ball.
Once placed, the adjustment piston (not shown) of the adjustment tool 57s can be operated to adjust the anchor 160a by increasing the fluid pressure in the working column 57 against the seated ball. The adjustment of the anchor 160a can be confirmed by the traction of the working column 57. Additional pressure can then be exerted to longitudinally release the adjustment tool 57s from the jacket column 155. Alternatively, the adjustment tool 57s can be released by rotation of the column working 57. The release of the adjustment column 57s can be confirmed by pulling the working column 57. Additional pressure can be exerted to release the ball from the seat. After cementation, packing 160p can be adjusted by articulation of the working column 57. Alternatively, anchor 160a can also be adjusted by articulation of the working column 57.
Figure 4C illustrates the operation of cement sensors 161a-f. The cement sensors 161a-f can each be capacitance sensors and can be spaced along the junctions 106 and connected by a data cable 163. The data cable 163 can be electrical or optical and the sensors of cement 161a-f can be energized via data cable 163 or have batteries. The data cable can extend along an outer surface of the casing joints 106 and be attached to it, be arranged in a groove formed on an outer surface of the casing joints, or be arranged in segments within a wall of the joints cladding and connected by couplings arranged at one end of each cladding junction. The cement sensors 161a-f can be in fluid communication with an annular crown 111 formed between the jacket column 155 and the well 150. The data cable 163 can be connected to the data coupling 162i. The data coupling 162i can be in communication with a corresponding data coupling 162o of the coating column 101. The data couplings 162i, o can be inductive, capacitive, radio frequency, or acoustic couplings and can provide contactless data communication. and can accommodate misalignment. The coating coupling 162o can be in data communication with the control line 142 by means of a lead wire. Control line couplings and data cable 162i, o can provide data communication between cement sensors 161a-f and a sampling head 164. Sampling head 164 can be located on surface 104s and be in data communication with PLC 25.
The cement sensors 161a-f may each include a semi-rigid coaxial cable 165 having a short section of inner conductor 165i that protrudes at its tip. Since the exposed tip 1665i can be an effective radiator in liquids of high permissiveness, it can be protected, such as by a 165n knurled castle nut. The knurled castle nut 165n can provide a surrounding ground plane while allowing free flow of cement paste 130a through tip 165i. In addition, each cement sensor 161a-f can be part of a cement sensor assembly that additionally includes a pressure and / or temperature sensor. Alternatively, each cement sensor 161a-f can be a pressure and / or temperature sensor instead of a capacitance sensor.
The sampling head 164 may include a pulse generator 164g and a pulse detector 164d. Pulse generator 164g can supply an incident pulse of step function 164p to data cable 163. Each sensor 161a-f can reflect a return pulse 164r back to pulse detector 164d. Alternatively, the sampling head 164 can be located on the jacket hanger 160 or on the outer casing column 101 as a part of it.
Figures 5A-5F illustrate a layer cementation operation performed using drilling system 1. As discussed above for the coating cementation operation, conditioner 130w can be circulated (not shown) by the cement pump 30c through the valve 59 or the mud pump 30m via the upper unit 12 to be prepared for pumping cement paste 130c. The anchor 160a can then be adjusted and the adjustment tool 57s released from the jacket 155, as discussed above. The working column 57 and the jacket 155 can then be rotated 180 ° from the surface by the upper unit 12 and the rotation can continue during the cementing operation. The cement paste 130c can be pumped from the mixer 36 to the cement injection head 50c through the valve 59 by the cement pump 30c. The cement paste 130c can flow to the launcher 58 and be deflected beyond the dart 75 through the diverter 58d and the bypass passes.
Once the desired amount of cement paste 130c has been pumped, cementing dart 75 can be released from launcher 58 by PLC 25 operating actuator 58a. The displacement fluid 130d can be pumped to the cementation injection head 51c via valve 59 via the cement pump 30c. The displacement fluid 130d can flow to the launcher 58 and be forced behind the dart 75 in closing the bypass passages, thereby propelling the dart into the hole in the working column. The pumping of displacement fluid 130 by the cement pump 30c can continue until the residual cement in the cement discharge line has been purged. The pumping of the displacement fluid 130d can then be transferred to the mud pump 30m with the closing of the valve 59 and the opening of the valve Kelly 11. The dart 75 can be driven through the hole in the working column by the displacement fluid 130d until the dart is placed in the wiper 175, thereby closing a hole in the wiper. The continued pumping of the displacement fluid 130d can put pressure on the seated dart 75 until the wiper 175 is released from the adjustment tool 57s.
Once the combined dart and wiper 75, 175 are released, they can be driven through the jacket hole by the displacement fluid 130d, thus driving the cement paste 130c through the float shoe 159 and to the annular crown 111. Pumping the fluid displacement 130d can continue until the combined dart and wiper 75, 175 are placed on collar 158. Placing the combined dart and wiper 75, 175 can increase the pressure on the jacket 155 and the bore of the work column and be detected by PLC 25 that monitors the pressure of the cane tube. Once the placement has been detected, the displacement fluid pumping 130d and the rotation 180 of the liner 155 can be stopped and the packing 160p adjusted. The adjustment tool 57s can be lifted off the jacket hanger 160 and the displacement fluid 130d circulated to eliminate excess cement paste. The pressure in the working column 57 and the shirt hole can be bled. Float shoe 159 can be closed, thereby preventing cement paste 130c from flowing back into the jacket hole.
In addition, the cementing head 50 can additionally include a lower dart and a lower cleaner can also be connected to the adjustment tool. The lower dart can be launched before pumping cement 130c.
Figure 6 illustrates the operation of the PLC 25 during the jacket cementing operation. PLC 25 can be programmed to operate choke 23 so that the target downhole pressure (BHP) is maintained at annular crown 111 during cementing operation and PLC 25 can perform a real-time simulation of cementing operation in order to predict the effective BHP of the measured data (as discussed above for the coating cementation operation). PLC 25 can then compare the predicted BHP with the target BHP and adjust the strangle 23 accordingly. In the initial stages of the cementation operation (figures 5A and 5B), the annulus can be filled only with conditioner 130w presenting the CD Wd. Conditioner 130w can be an ECD Wd smaller or substantially less than an EDC Cd of cement 130c. The WD ECD of the conditioner may also be insufficient to maintain the target BHP without the addition of choke back pressure 23.
Due to the deviated portion of well 150, a static density Cs of cement 130c corresponding to the target BHP at the completion of the cementing operation may not be available, since the larger ECD would likely exert a BHP that exceeds the target pressure. Since cement 130c flows into annular crown 111 (figures 5C and 5D), the effective BHP can begin to be influenced by the cement ECD Cd.
PLC 25 can predict the double gradient effect on the predicted BHP and reduce back pressure according to the relaxation of the choke 23. PLC 25 can continue to relax the choke as a level of cement 130c in the annular crown 111 increases and the influence of cement Cd ECD on BHP increases to maintain parity of the actual / expected BHP with the target BHP. PLC 25 can be in data communication with the 30m mud pump. Once the cement level approaches the jacket hanger 160, the PLC 25 will be able to reduce a displacement fluid flow rate 130d pumped by the mud pump 30m and compress the choke 23 to increase the back pressure while reducing the ECD Cd of the cement so that when the cement level reaches the jacket hanger 160, the choke 23 can be closed to seal the greatest back pressure in the annular crown 111, thus maintaining the target BHP. The packing 160p can then be adjusted while the sealed counter pressure is exerted on the annular crown 111. Additionally, the annular crown 30a can be operated to help increase the pressure while the rate of the mud pump 30m is being reduced.
During the cementing operation, the PLC 25 can monitor the cement sensors 161a-f via the sampling head 164 to track the level of cement in the annular crown 111. The PLC 25 can also perform mass balance during the cementing operation. , as discussed above for the coating cementation operation. Once the packing 160p is adjusted during curing, PLC 25 can instead rely on cement sensors 161a-f to monitor the curing operation for forming fluid 130f entering the annular crown 111 or the cement paste 130c entering formation 104b. From the data, such as complex permissiveness, obtained from the cement sensors 161a-f during the curing operation and over a broadband frequency range, such as between ten kilohertz and ten gigahertz, the PLC 25 can perform an analysis dielectric spectroscopy of time domain reflectometry (TDRDS), such as by Fourier transformation, during and / or after the curing operation.
From the analysis, PLC 25 can determine one or more parameters of the curing operation, such as the disappearance of water in hydration (also known as free water relaxation, which appears close to ten gigahertz), water connection to the microstructure of developing cement (also known as confined water relaxation, which appears near one hundred megahertz), migration of local ions in the developing cement micro-structure (also known as low relaxation, which apparatus near one megahertz), and a bypass of long-range ions through the developing cement microstructure (also known as ion conductivity, which appears below one megahertz). PLC 25 can compare each parameter to a known reference parameter to assess the integrity of the cured cement bond. In addition, PLB 25 can plot parameters against curing time and graphically display parameters for manual evaluation. PLC 25 can superimpose plots for a specific parameter at various depths of sensors 161a-f with the reference parameter.
Based on the monitoring and control of the cementation operation and the monitoring and analysis of the curing operation, the PLC 25 can determine the acceptability of the cured cement bond. In the event that PLC 24 determines that cured cement is unacceptable, the PLC may make recommendations for corrective action, such as a cement bonding / assessment record and / or a secondary cementation operation. In addition, PLC 25 can identify depths of defects in annular crown 111 based on the location of the specific sensor that detected the defect. Defect identification can facilitate corrective action.
Alternatively, the inner casing column 105 may have the cement sensors 161a-f and the data cable 163 arranged along it or at least along a portion thereof corresponding to the exposed portion of the well 100.
Figures 7A-C illustrates an offshore drilling system 201 in a drilling mode, according to another embodiment of the present invention. The 201 drilling system may include a mobile offshore drilling unit (MODU) 201m, such as a semi-submersible platform, drilling rig 1r, a 201f fluid control system, a 201t fluid transport system, and a pressure control assembly (PCA) 201p. Alternatively, a fixed offshore drilling unit or a floating floating offshore drilling unit can be used instead of the MODU 1m. MODU 1m can drive drilling rig 1r and the 201f fluid control system on board and can include a maneuver opening through which drilling operations are conducted. The 1m semi-submersible MODU may include a lower raft hull that floats below a surface (also known as a waterline) 204w of the sea 204 and is therefore less subject to surface wave action. The stability columns (only one shown) can be mounted on the lower raft hull to support an upper hull above the waterline. The upper hull may have one or more decks for carrying the drilling rig 1r and the fluid control system 201f. MODU 1m can additionally have a dynamic positioning system (DPS) (not shown) or be tied up to keep the maneuver opening in position on the 221 underwater well.
The drilling rig 1r may additionally include a drill string compensator (not shown) to explain the lifting of the MODU 1m. The drill string compensator can be arranged between the catarina 13 and the upper unit 12 (also known as hook-mounted) or between the crowning block 15 and the tower 2 (also known as top-mounted). Drill column 207 may include a downhole assembly (BHA) 207b and drill pipe joints 57p connected together, such as by threaded couplings. The BHA 207h can be connected to drill pipe 57p, such as via a threaded connection, and include a drill 207b and one or more drill commands 207c connected to it, such as via a threaded connection. The drill 207b can be generated at 180 by the upper unit 12 via the drill pipe 57p and / or the BHA 207h can additionally include a drill motor (not shown) to rotate the drill. The BHA 207h can additionally include an instrumentation sub (not shown), such as a sub-meter during drilling (MWD) and / or profiling during drilling (LWD).
The PCA 201p can be connected to a wellhead 50 located adjacent to the bottom 204f of the sea 204. A conductive column 202p, h can be driven to the bottom of the sea 204. The conductive column 202p, h can include a housing 202h and junctions conductor tube 202p connected to each other, such as by threaded connections. Once the conductive column 202p, h has been adjusted, an underwater well 200 may be drilled on the seabed 204f and an outer covering column 203 may be deployed in well 200. The outer covering column 203 may include a housing wellhead and liner joints connected together, as well as by threaded connections. The wellhead housing can be placed in the conductive housing during the deployment of the outer casing column 203. The outer casing column 203 can be cemented 102 into the well 200. The outer casing column 203 can extend to a depth adjacent to a bottom of the upper 104u formation. Although shown as vertical, well 200 may include a vertical portion and an offset portion, such as horizontal.
PCA 201p may include a wellhead adapter 226b, one or more flow crossings 223u, m, b, one or more overflow safety systems (BOPs) 220a, u, b, an LMRP (Lower Marine Conductor Package) , one or more accumulators 211, a receiver 227, a break line 229k, and a choke line 229c. The LMRP can include a control pod 225, a flexible joint 228, and a connector 226u. The wellhead adapter 226b, the flow intersections 223u, m, b, the BOPs 220a, u, b, the receiver 227, the connector 226, and the flexible gasket 228 can each include a housing having a hole longitudinal through it and can each be connected, such as by flanges, in such a way that a continuous hole is maintained through it. The hole may have an internal diameter, corresponding to an internal diameter of the wellhead 221.
The connector 226u or the wellhead adapter 226b may include one or more fasteners, such as clamps, to secure the LMRP to the BOPs 220a, u, b and the PCA 201p to an external profile of the wellhead housing, respectively. The connector 226u or the wellhead adapter 226b may additionally include a sealing sleeve to engage an internal profile of the respective receiver 46 and the wellhead housing. The connector 226u or the wellhead adapter 226b can be in electrical or hydraulic communication with the control capsule 25 and / or additionally include an electric or hydraulic actuator and an interface, such as a hot rod, so that an underwater vehicle remotely operated (ROV) (not shown) can operate the actuator to engage the clamps with the external profile.
The LMRP can receive a lower end of a marine conductor 250 and connect the conductor to the PCA 201p. The control pod 225 can be in electrical, hydraulic and / or optical communication with the PLC 25 on board the MODU 201m via an umbilical line 206. The control pod 225 can include one or more control valves (not shown) in communication with BOPs 220a, u, b for operating it. Each control valve can include an electric or hydraulic actuator in communication with umbilical line 206. Umbilical line 206 can include one or more hydraulic or electrical control cables / conduit for actuators. Accumulators 211 can store pressurized hydraulic fluid to operate BOPs 220a, u, b. Additionally, accumulators 211 can be used to operate one or more of the other components of the PCA 201p. The umbilical line 206 may additionally include hydraulic, electrical, and / or optical control cables / conduits to operate various functions of the PCA 201p. PLC 25 can operate PCA 201p via umbilical line 206 and control capsule 225.
A lower end of the interruption line 229k can be connected to a branch of the upper flow crossing 223u by a shut-off valve 208a. An interruption manifold can also be connected to the lower end of the interruption line and have a pin connected to a respective branch of each 223m flow intersection, b. Shut-off valves 208b, c can be arranged on respective compression manifold pins. Alternatively, a separate line (not shown) can be connected to the branches of the flow intersections 223m, b instead of the interrupt collector. An upper end of the interruption line 229k can be connected to the output of the annular crown pump 30a. A lower end of the choke line 229c may have pins connected to the respective second branches of flow intersections 223m, b. Shut-off valves 208d, and can be arranged on respective pins on the lower end of the choke line.
A pressure sensor 235a can be connected to the second branch of the upper flow crossing 223u. Pressure sensors 235b, c can be connected to the choke pins between the respective shut-off valves 208d, r and the respective second flow crossing branches. Each pressure sensor 235a-c can be in data communication with the control capsule 225. Lines 229c, k and umbilical line 206 can extend between MODU 201m and PCA 201p and are attached to the arms along the conductor 250 Each line 229c, k can be a flow conduit, such as coiled tubes. Each shut-off valve 208a-e can be automated and have a hydraulic actuator (not shown) operable by the control capsule 225 via fluid communication with the respective umbilical conduit or the LMRP 211 accumulators. Alternatively, the valve actuators can be electric or pneumatic.
The 201t fluid transport system can include a UMRP (Upper Marine Conductor Package) 251, a marine conductor 250, and a 229r return line. Conductor 250 can extend from PCA 201p to MODU 201m and can be connected to MODU via UMRP 251. UMRP 251 can include conductor compensator 240, diverter 252, flexible joint 253, sliding joint (also known as telescopic) 254, a tensioner 256, and an RCD 255. A lower end of the RCD 255 can be connected to an upper end of the conductor 250, such as by a connection provided with a flange. An auxiliary umbilical line 212 can have hydraulic conduits and can provide fluid communication between an RCD 255 face and the PLC 25 HPU. Slip joint 254 can include an outer barrel connected to an upper end of RCD 255, such as as by a connection provided with a flange, and an internal barrel connected to the flexible joint 253, as by a connection provided with a flange. The outer barrel can also be connected to tensioner 256, such as by a tensioning ring (not shown). RCD 255 can be located adjacent to water line 204 and can be submerged.
Alternatively, the RCD 255 can be located above the water line 204w and / or along the UMRP 251 at any location other than its lower end. Alternatively, RCD 255 can be located at an upper end of UMRP 251 and slide joint 254 and the arm connecting the UMRP to equipment 1r can be omitted or the slide joint can be locked instead of being omitted. Alternatively, RCD 255 can be mounted as part of conductor 250 at any location along it or as part of PCA 1p.
The flexible joint 253 can also be connected to the diverter 252, such as by a connection provided with a flange. The diverter 252 can also be connected to the floor of the equipment 4, such as by an arm. Sliding joint 254 can be operable to extend and retract in response to lifting the MODU 201m with respect to conductor 250 while tensioner 256 can wrap wire in response to lifting, thereby supporting conductor 250 from MODU 201m while accommodating the lift. The flexible joints 253, 228 can accommodate the respective horizontal and / or rotational movement (also known as tilt and rotation) of the MODU 201m with respect to conductor 250 and the conductor with respect to PCA 201p. Conductor 250 may have one or more flotation modules (not shown) arranged along it to reduce the load on tensioner 256.
Conductor compensator 240 can be employed to assist PLC 25 in maintaining parity of effective and targeted BHPs instead of or in addition to having to adjust throttle 23. Conductor compensator 240 may include an accumulator 241, a gas source 242, a pressure regulator 243, a flow line, one or more shut-off valves 234, 248, and a pressure sensor 246.
The shutoff valve 245 can be automated and have a hydraulic actuator (not shown) operable by the PLC 25 via fluid communication with the HPU. The shut-off valve 245 can be connected to an inlet of RCD 255. The flow line can be a flexible conduit, such as a hose, and can also be connected to a volume of compressed gas 241 via a flow T. Accumulator 241 can store only one volume of compressed gas, such as nitrogen. Alternatively, the accumulator can store both liquid and gas and can include a partition, such as a bladder or piston, to separate the liquid and gas. A liquid and gas interface 247 can be in the flow line. The shutoff valve 248 can be arranged in a vent line of the accumulator 241. The pressure regulator 243 can be connected to the flow line via a T branch. The pressure regulator 243 can be automated and have an adjuster operable by the PLC 25 via a fluid communication with the HPU or electrical communication with the PLC. A set pressure of regulator 243 can correspond to a set pressure of throttle 23 and both set pressures can be set in tandem. The gas source 242 can also be connected to the pressure regulator 243.
Conductor compensator 240 can be activated by opening shut-off valve 245. During lifting, when drill column 207 (and / or conductor 250) moves downward, the volume of fluid displaced by the downward motion may flow through the shut-off valve 245 for the flow line, moving the liquid and gas interface 247 towards the accumulator 241 and accommodating the downward movement. Interface 247 may or may not move to accumulator 241. When drill column 207 (and / or conductor 250) is moved upward, interface 247 may be moved along flow line 244 away from accumulator 241, replacing thus the volume of fluid moved through it.
The fluid control system 201f can include pumps 30c, a, m, mud sieve 33, flow meters 34ac, a, m, r, pressure sensors 35c, a, m, r, throttle 23 , and the degassing spool 230. A lower end of return line 229r can be connected to an output of RCD 255 and an upper end of return line 229r can be connected to a return spool. An upper end of the choke line 229r can also be connected to the return spool. The return pressure sensor 35r, the throttle 23, and the return flow meter 34r can be mounted as part of the return spool. A lower end of the cane tube can be connected to an outlet of the mud pump 30d and an upper end of a Kelly hose can be connected to an inlet of the upper unit 5. The 35d supply pressure sensor and the supply flow meter 34d can be assembled as part of a supply line (cane tube and Kelly hose).
The degassing spool 230 may include automated shut-off valves at each end, a mud-gas separator (MGS) 232, and a gas detector 231. A first end of the degassing spool can be connected to the return spool between the meter return flow rate 34r and the mud screen 33 and a second end of the degassing spool can be connected to an inlet of the mud screen. The gas detector 231 may include a probe featuring a membrane for sampling the gas from the 130r returns, a gas chromatograph, and a conveyor system for dispensing the gas sample in the chromatograph. The MGS 231 can include a liquid inlet and outlet mounted as part of the degassing spool and a gas outlet connected to a flare (not shown) or a gas storage container.
Figure 7D illustrates a dynamic formation integrity test (DFIT) performed using drilling system 201. During drilling of lower formation 104b, PLC 25 can periodically increase BHP from target BHP to a pressure corresponding to a pressure expected pressure that will be exerted on the lower formation during the cementation operation The PLCV 25 can increase BHP to the expected pressure with compression of the choke 23. The expected pressure may be slightly less than the fracture pressure of the lower formation 104b. The expected pressure can be maintained for a desired depth and / or time period. In case the lower formation 104b withstands the expected pressure, then the cementing operation can proceed, as planned. In the event that 130r returns leak into formation during DFIT, then the cementing operation may have to be modified, such as adding the return pump 270 (or alternatives discussed below) or modifying the properties of the 130c cement slurry to decrease the expected pressure.
Figures 7E and 7F illustrate the monitoring of the cement cure of an underwater coating cementing operation conducted using drilling system 201. Once well 200 has been drilled in the lower reservoir 104b to a desired depth, the drilling column 207 can be recovered from well 200 and an inner lining column 205 can be deployed into well 200. Inner lining column 205 can include lining junctions 106, centralizers 107, float collar 108, guide shoe 109 , and a coating hanger 224. The coating hanger 224 may include a body 224b, an anchor 224a, and a packing 224p.
The inner casing column 205 can be deployed in the well 200 using a working column 257. The working column 257 can include pipe joints, such as a 57p drill pipe, connected together, such as by screw connections, a head sealing 257hg, and a 257s adjustment tool. An upper cleaner 175u and a lower cleaner 175b, each similar to the jacket cleaner 175, can be connected to a bottom of the adjustment tool. The adjustment tool 257s can connect the inner casing column 205 to the work column 257. The work column 257 can also be connected to an underwater cement head (not shown). The subsea cementing head may be similar to the jacket cementing head 50 except that the subsea cementing head may include an upper dart 75u and a lower dart 75b to engage the upper wiper 175u and the lower wiper 175b, respectively , and the injection heads may or may not be omitted. The subsea cementing head can also be connected to the Kelly 11 valve.
Anchor 224a may include a cam and one or more fasteners. The anchor can be placed on a ledge formed on an internal surface of the wellhead housing. The wellhead housing can also have a locking profile (not shown) formed on an internal surface of the well to receive the anchor fasteners. The anchor can be operable to extend the anchor fasteners for engagement with the wellhead locking profile, thus longitudinally connecting the casing hanger to the wellhead 221. The anchor cam can be operated by articulating the working column 257, such as by adjusting the weight on anchor 224a or rotating the working column. Anchor 224a may additionally include flow passages formed therethrough to allow the flow of fluid returns from the cementing operation.
The packing 224p can be operable to be radially expanded for engagement with an internal surface of the wellhead housing, thereby isolating the wellhead-facing interface. The adjustment tool 257s can be operable to adjust anchor 224a and packing 224 independently. The packing 224p can be adjusted by the additional articulation of the working column 257. Alternatively, the adjustment tool can be operated to adjust the anchor and / or the packing hydraulically, as discussed above for the 57s jacket adjustment tool. The adjustment tool 257s can be released from the coating hanger 224 by pivoting the working column 257 or hydraulically.
To cement the internal lining column 205, the conditioner 130w can be circulated by the cement pump 30c through the valve 59 or by the mud pump 30m via the upper unit 12 to prepare for pumping the cement paste 130c. The anchor 224a can then be adjusted and the adjustment tool 157s is released from the coating hanger 22. The lower dart 75b can be released from the subsea cement head. The cement paste 130c can be pumped from the mixer 36 into the subsea cementing head via valve 59 by the cement pump 30c. The cement paste 130c can flow to the launcher and be deflected beyond the upper dart via the diverter and bypass passages. The cement paste 130c can propel the lower dart 75b through the hole in the working column.
Once the desired amount of cement paste 130c has been pumped, the upper dart 75u can be released from the launcher by PLC 25. Depending on the length of the inner liner 205 and the depth of the wellhead 221, the lower dart 75b can be placed in the lower cleaner 175b before or after the pumping of the cement paste 130c has ended. The displacement fluid 130d can be pumped to the subsea cement head via valve 59 by the cement pump 30c. The displacement fluid 130d can flow into the launcher and be forced behind the lower dart 75u, thereby driving the upper dart into the hole in the working column. The pumping of displacement fluid 130d by the cement pump 30c can continue until residual cement in the discharge line has been purged. The pumping of displacement fluid 130d can then be transferred to the mud pump 30m by closing valve 59 and opening valve Kelly 11.
The upper dart 75u can be driven through the hole in the work column by the displacement fluid 130d (while driving the lower dart and wiper 175b combined through the bore hole) until the upper dart 75u is placed in the wiper upper 175u and the lower dart and the cleaner are placed on the float collar 108. A diaphragm (not shown) of the lower dart 75b can break and the cement paste 130c can be driven through the float collar 108 and the guide shoe 109 and for the annular crown 210c. Pumping of displacement fluid 130d can continue until the combined 75u upper dart and 175u cleaner are placed on the floating collar 108. Placing the combined 75u upper dart and 175u dart can increase the pressure in the casing hole and column and be detected by the PLC 25 that monitors the pressure of the cane tube. Once the placement has been detected, pumping displacement fluid 130d may be stopped. The pressure in the hole in the working column and the casing can be bled. Float valve 108 can close, thereby preventing cement slurry 130c from flowing back into the casing hole.
During the cementing operation, the PLC 25 can be programmed to operate the choke 23 so that the target downhole pressure (BHP) is maintained at the annular ring 210c during the cementing operation and the PLC 25 can run a simulation in real time of the cementation operation in order to predict the effective BHP of the measured data (as discussed above for the coating cementation operation). PLC 25 can then compare the predicted BHP with the target BHP and adjust the strangle 23 accordingly. The PLC 25 can also perform mass balance and adjust the target accordingly. PLC 25 can also determine the level of cement in the annular ring 210c.
Once the casing hole has been bled, the annular crown pump 30a can be operated to pump indicator fluid 130i to the lower flow intersection 223b via the break line 229k. Indicator fluid 130i can flow radially through the wellhead 221 and out of the wellhead to the choke line 229c.
Insofar as packing 224p has not been adjusted, the indicator fluid path may be in fluid communication with the annular crown 210c, thus forming a T with the annular crown as a stagnant branch. Indicator fluid 130i can continue through choke 23, return flow meter 34r, and mud sieve 33. Circulation of indicator fluid 130i can be maintained during the curing period. As the indicator fluid 130i is being circulated, the PLC 25 can perform a mass balance between the input and output of the indicator fluid to / from the wellhead 21 to monitor the forming fluid 130f entering the annular ring 210c or the cement paste 130c entering formation 104b using flow meters 34a, r. The PLC 25 can compress the choke 23 in response to the detection of forming fluid 130f entering the annular crown 210c and relax the choke 23 in response to the entrance of the cement paste 130c into the formation 104b.
The conductor compensator 240 can be operated during the cementing and curing operation to cancel the effect of the lift on the mass balance. Alternatively, PCL 25 may include one or more sensors (not shown) to adjust the mass balance during curing to explain the lift, such as an accelerometer and / or an altimeter. Alternatively, the PLC 25 can be in data communication with the MODU dynamic positioning system and / or the tensioner and receive necessary lifting data from them. PLC 25 can also adjust throttling 23 to maintain effective and targeted BHP parity during cementation and / or curing in response to the MODU lift. Once the cure is complete, the adjustment tool 257s can be operated to adjust the packing 224p.
Alternatively, packing 224p can be adjusted after the cementation operation (before curing) and monitoring of curing can be omitted. Alternatively, packing 224p can be adjusted after the cementing operation (prior to curing) and the inner liner 205 can include any of the cement sensors 161a-f, data cable 163, and wireless data coupling 162i. The wireless data coupling 162o can be arranged on the wellhead 221 and the wellhead can include a second wireless data coupling (not shown) connected to the external coupling by the lead wire which can interface with one second corresponding wireless data coupling arranged in the wellhead adapter 226b which can be in data communication with the capsule 225 via a direct connection. The PLC 25 can then receive measurements from the cement sensors 161a-f to monitor the curing (and cementing) operation.
Figure 8A illustrates the monitoring of the cement cure of an underwater coating cementing operation conducted using a second offshore drilling system, according to another embodiment of the present invention. The second drilling system may include the MO-DU 201m, the drilling rig 1r, the fluid control system 201f, the fluid transport system 201t, and a pressure control assembly (PCA) 261p. PCA 261p may include wellhead adapter 226b, flow intersections 223u, m, b, overflow safety systems (BOPs) 220a, u, b, LMRP, accumulators 211, receiver 227, a bottleneck line 229c, break line 229k, a second RCD 265, and an underwater flow meter 234.
The second RCD 265 can be similar to the RCD 255. With reference also to figure 8B, the second RCD 265 can include an outlet 265o, an interface 265a, the housing 265h, a latch 265c, and an internal reinforcement accessory 265r. The housing 265h can be tubular and include one or more sections connected to each other, such as by connections provided with flange. The housing 265h may additionally include an upper flange connected to an upper housing section, such as by welding, and a lower flange connected to a lower housing section, such as by welding.
Coupling 265c may include a hydraulic actuator, such as a piston, one or more fasteners, such as clamps, and a body. The coupling body can be connected to housing 265h, such as by a screw connection. A piston chamber can be formed between the housing and an intermediate housing section. The coupling body may have holes formed through a wall thereof to receive the respective clips. The engagement piston can be arranged in the chamber and can conduct seals that isolate an upper portion of the chamber from a lower portion of the chamber. A cam surface can be formed on an internal surface of the piston to radially displace the clamps. Hydraulic orifices (not shown) can be formed through the intermediate housing section and can provide fluid communication between interface 265a and the respective portions of the hydraulic chamber for the selective operation of the coupling piston. A jumper can have hydraulic ducts and can provide fluid communication between the RCD 265a interface and the control capsule 225.
The internal reinforcement accessory 265r may include a bearing assembly 265b, a housing seal assembly, one or more extractors, and a capture sleeve. The bearing assembly 265b can support the sleeve extractors in such a way that the extractors can rotate with respect to the housing 255h (and the sleeve). Bearing assembly 265b may include one or more radial bearings, one or more thrust bearings, and a self-contained lubricating system. The lubricating system may include a reservoir featuring a lubricant, such as bearing oil, and a balance piston in communication with the return fluid 130i, r, w (depending on the common operation that is performed) to maintain the oil pressure in the reservoir at a pressure equal to or slightly higher than the return fluid pressure. The bearing assembly 265b can be arranged between the extractors and be housed in the capture sleeve and connected to it, such as by a screw connection and / or fasteners.
The internal reinforcement accessory 265r can be selectively connected longitudinally to the housing 265h by engaging the lock 265c with the catching sleeve. The housing seal assembly may include a body that conducts one or more seals, such as O-rings, and a retainer. The retainer can be connected to the capture sleeve, such as by a screw connection (not shown), and the sealing body can be trapped between a shoulder of the sleeve and the retainer. The housing seals can isolate an annular crown formed between the housing 265h and the internal reinforcement accessory 265r. The capture sleeve can be torsionally attached to housing 265h, such as by sealing friction or corresponding anti-rotation profiles.
The top puller may include the stuffing box and a seal. The stuffing box can include one or more sections, such as a first section and a second section, connected, such as by a threaded connection. The upper extractable seal can be connected to the first section, such as by fasteners (not shown), such that the upper extractable seal is longitudinal and torsionally coupled to it. The second section can be connected to a rotating mandrel of the bearing assembly, such as by a threaded connection, such that the stuffing box is longitudinal and torsionally coupled to it. The bottom puller can include a retainer and a seal. The lower withdrawable seal can be connected to the extractor retainer, such as by fasteners (not shown), such that the withdrawable seal is longitudinal and torsionally coupled to it. The extractor retainer can be connected to the rotating mandrel, such as by a threaded connection, such that the retainer is longitudinal and torsionally coupled to it.
Each withdrawable seal can be directional and oriented to seal against the drill pipe 57p in response to the higher pressure in the wellhead 221 than the conductor 250. Each withdrawable seal can have a conical shape so that the fluid pressure acts against a respective conical surface, generating the sealing pressure against the 57p drill pipe. Each withdrawable seal may have an internal diameter slightly smaller than the diameter of the drill pipe 57p to form a forced fit between them. Each withdrawable seal can be formed from a polymer, such as a thermoplastic, elastomer, or copolymer, flexible enough to accommodate the seal against the threaded couplings of the drill pipe 57p having a larger tool joint diameter. The lower withdrawable seal can be exposed to the return fluid 130i, r, w to serve as the primary seal. The upper withdrawable seal may be inactive, as long as the lower withdrawable seal is working. In the event that the lower withdrawable seal fails, returns 130r may leak through and exert pressure on the upper withdrawable seal via an annular fluid passage formed between the bearing mandrel and the drill pipe 57p. The drill pipe 57p can be received through a hole in the internal reinforcement fitting 255r so that the withdrawable seals can engage the drill pipe. Extractable seals can provide a barrier in conductor 250 or when drill pipe 57p is stationary or rotating.
Alternatively, the internal reinforcement accessory can be connected non-reliably to the housing. Alternatively, an active seal RCD can be used. The active sealing RCD can include one or more bladders (not shown) instead of withdrawable seals and can be inflated to seal against the drill pipe by injecting the inflation fluid. The internal reinforcement accessory of the active sealing RCD can also serve as a hydraulic injection head to facilitate inflation of the bladders. Alternatively, the active seal RCD may include one or more packings operated by one or more pistons of the internal reinforcement fitting. Alternatively, a lubricated filling assembly can be used.
A lower end of the second RCD housing 265h can be connected to the annular BOP 220a and an upper end of the second RCD housing can be connected to the upper flow crossing 223u, such as by connections provided with flange. A 265p pressure sensor can be connected to an upper housing section of the second RCD 265 above the internal reinforcement fitting 265r. The pressure sensor 256p can be in data communication with the control capsule 225 and the second closing piston RCD can be in fluid communication with the control capsule via the interface 265a of the second RCD 265.
A lower end of a submarine bypass spool 262 can be connected to the second RCD outlet 265o and one end of the spool can be connected to the overflow crossing 223u. The bypass spool 262 may have a first 209a and a second 209b shut-off valves and subsea flow meter 234 mounted as a part thereof. Each shutoff valve 209a, b, b can be automated and have a hydraulic actuator (not shown) operable by the control capsule 225 via fluid communication with the respective umbilical conduit or the LMRP 211 accumulators. The underwater flow meter 234 can be a mass flow meter, such as a Coriolis flow meter, and can be in data communication with the PLC 25 via capsule 225 and umbilical line 206. Alternatively, an underwater volumetric flow meter can be used instead of the mass flow meter.
Return fluid 130i, r, w can flow through annular ring 210c to wellhead 221. Fluid 130i, r, w can continue from wellhead 221 to second RCD 265 via BOPs 220a, u, b . The return fluid 130i, r, w can be diverted by the second RCD 265 to the submarine diversion reel 262 via the outlet of the second RCD 265o. The return fluid 130i, r, w can flow through the second open shut-off valve 209, the submarine flow meter 234, and the first shut-off valve 209a to a branch of the upper flow crossing 223u. The return fluid 130i, r, w can flow to the conductor 250 via the upper flow crossing 223u, the receiver 227, and the LMPR. The return fluid 130i, r, w can flow to the conductor 250 for the first RCD 255. The return fluid 130i, r, w can be diverted by the first RDC 255 to the return line 229 via the output of the first RCD. The return fluid 130i, r, w can continue from the return line 29 and to the return spool. The return fluid 130i, r, w can flow through the choke 36 and the return flow meter 34r to the mud screen 33.
During the drilling, cementing and curing operation, the PLC 25 can rely on the underwater flow meter 234 instead of the surface flow meter 34r to perform BHP control and mass balance. The surface flow meter 34r can be used as a spare to the underwater flow meter 234 in the event of failure of the underwater flow meter.
Figures 8B and 8C illustrate an underwater coating cementing operation conducted using a third offshore drilling system, according to another embodiment of the present invention. The third drilling system may include the MODU 201m, the drilling rig 1r, the fluid control system 201f, and a pressure control assembly (PCA) without pressure 271p. Conductorless PCA 271p may include wellhead adapter 226b, flow intersections 223m, b, overflow safety systems (BOPs) 220a, u, b, accumulators 211, receiver 227, the break line 229k, the choke line 229c, the second RCD 265, a return line 275, and a return pump 270. Submarine well 200 can also be drilled without a conductor using the third drilling system. Return line 275 may include a deflection spool (not shown) around return pump 270 such that return pump 270 can be selectively employed.
A lower end of the return line 275 can be connected to the output of the second RCD 265o and to an upper end of the return line 275 can be connected to the return spool. The return pump 270 can be mounted as part of the return line 275 and can include a submersible electric motor 270m and a centrifugal pump stage 270p. The return pump 270 may additionally include a cage frame (not shown) featuring a mud mat to rest on the seabed. A 270m motor shaft can be torsionally connected to a 270p pump stage shaft via a gearbox or directly (without gear). A lower end of a 272 power cable can be connected to the motor 270m and an upper end of a 272 power cable can be connected to a motor drive (not shown) on board the MODU 201m and in data communication with the PLC 25. The motor drive can be a variable speed drive and the PLC 25 can control the operation of the return pump 270 with the variation of a rotational speed of the motor 270m. The return line 275 can additionally include a discharge pressure sensor 273 in data communication with the control capsule 225 and the PLC can monitor the operation of the return pump using the discharge pressure sensor and one of the pressure sensors 235b , c as an inlet pressure sensor. Alternatively, the throttle 23 can be used to control the return pump 270.
In addition, the pump stage 270p may be able to accommodate the cuttings or the return pump 270 may additionally include a cutter collector and / or sprayer (not shown). Alternatively, the PLC 25 can determine the inlet and discharge pressures of the pump stage by monitoring the energy consumption of the 270m motor. Alternatively, the pump stage 270p can be positive displacement and / or the return pump can include multiple stages. Alternatively, the 270m engine can be hydraulic or pneumatic. If it is hydraulic, the 270m engine can be driven by a power fluid, such as sea water or hydraulic oil.
With reference to figure 8C, an ECD Wd of conditioner 130w can correspond to a limit pressure gradient of the lower formation, such as pore pressure gradient, fracture pressure gradient, or an average of the two gradients. However, due to the fact that the double gradient effect caused by a substantially lower density SS of the sea 204, conditioner 130w may otherwise fracture the lower formation 104b, if not for operation of the return pump 270 (Pump Delta) . The return pump 270 can compensate for the double gradient effect effectively by creating a corresponding double gradient effect so that the conditioner 130w does not fracture the lower formation 104 during conditioning. A static density (only EDC shown) of cement 130c can also correspond to the limit pressure gradient.
Since cement 130c flows into annular ring 210c, effective BHP may begin to be influenced by the ECD cement of cement. PLC 25 can anticipate the double gradient effect on the expected BHP and increase the rotational speed of the pump, thereby increasing the pump delta. PLC 25 can continue to increase the pump speed (thereby increasing the pump delta) as a CL level of cement 130c in annular ring 210c is high and the influence of ECD Wd on BHP increases to maintain BHP parity effective / expected with the target BHP. During the cementing operation, the PLC 25 can track the level of cement CL in the annular crown 210c and can also perform mass balance and adjust the target accordingly, as discussed above.
Once the cement pumping 130c is complete, the casing hole can be bled, and indicator fluid 130i can be supplied for flow crossing 223b via interruption line 225k for circulation through wellhead 221 using the pump of 270 returns to maintain parity between effective and target BHPs while PLC 25 monitors fluid ingress / egress. In the event that PLC 25 detects ingress, the PLC can slow the return pump 270, and if the PLC detects the egress, the PLC can increase the pump speed. If PLC 25 detects severe ingress during cementation or curing, the PLC can close and deflect the return pump 270.
Alternatively, return line 275 can be secured, and indicator fluid 130i can be circulated through wellhead 221 with the operation of annular crown pump 30a to pump indicator fluid 130i to flow intersection 223b via the flow line. 225k interruption. The indicator fluid 130i can then be returned to MODU 201m via the choke line 229c. Pressure control can be maintained on curing cement 130c by throttle 23. Alternatively, the ECD conditioner can be less than the pore pressure gradient and annular crown pump 30a and throttle 23 can be used to control the BHP during conditioning and then the BHP control can be moved to the return pump 270 for / during cementation.
Alternatively, a floating fluid, such as base oil or nitrogen, can be injected into the RCD 265i inlet instead of using the return pump 270, thus mixing it with the return fluid 130i, r, w and forming a return mixture presenting a density substantially less than a density of the return fluid, such as a density corresponding to seawater. Alternatively, the return pump 270 can be added to the bypass spool 262 in addition to or instead of the underwater flow meter 234. Alternatively, the underwater flow meter 234 can be used in the driverless PCA 271p instead of or in addition to the return pump 270.
Figures 9A and 9B illustrate the monitoring of the cement cure of an underwater coating cementing operation conducted using a fourth offshore drilling system, according to another embodiment of the present invention. Figures 9C and 9E illustrate a wireless cement sensor sub 282a of an alternative internal lining column 295 that is cemented. Figure 9D illustrates a radio frequency identification (RFID) tag 280a-c for communication with sensor sub 282a. Figure 9F illustrates the fluid control system 281f of the drilling system. The fourth drilling system can include the MODU 201m, the drilling rig 1r, the fluid control system 281f, the fluid transport system 201t, and the pressure control assembly (PCA) 201p.
Once well 200 has been drilled in the lower reservoir 104b at the desired depth, drill column 207 can be recovered from well 200 and inner liner column 295 can be deployed in well 200 using working column 257. The column internal workpiece 295 may include casing joints 106, centralizers 107, float collar 108, guide shoe 109, casing hanger 224, and one or more wireless cement sensor subs 282a-f. A lower sensor sub 282 can be mounted adjacent to the guide shoe 109 and / or the float collar 108. The remainder of the sensor subs 282a, cf can be spaced along a portion of the casing column 295 above the upper dart 75u.
Each sensor sub 282a-f can include a housing 287, one or more cement sensors 283p, t, an electronics housing 284, one or more antennas 285r, t, and a power source. Cement sensors 283p, t can include a pressure sensor 283p and / or temperature sensor 283t. The respective components of each sensor sub 282a-f can be in electrical communication with each other by conductors or a bus. The power source can be a 286 battery or a capacitor (not shown). Antennas 285r, t may include an external antenna 285r and an internal antenna 285t. The lower sensor sub 282b may not need the internal antenna 285t and the sensor subs 282c-f may not need the external antenna 285r.
Housing 287 may include two or more tubular sections 287u, b connected together, such as by threaded connections. The housing 287 may have couplings, such as threaded couplings, formed on a top and bottom thereof for connection to another component of the coating column 295. The housing 287 may have a receptacle formed between sections 287u, b thereof to receive electronics packaging 284, battery 286, and internal antenna 285t. To prevent interference with antennas 285r, t, housing 287 may be formed from diamagnetic or paramagnetic metal or alloy, such as authentic stainless steel or aluminum. The housing 287 may have one or more radial holes formed through a wall thereof to receive the respective sensors 283p, such that the sensors are in fluid communication with the annular ring 210c.
Electronics packaging 284 may include a control circuit 284c, a transmitter circuit 284t, and a receiver circuit 284r. The control circuit 284c can include a microprocessor controller (MPC), a data recorder (MEM), a clock (RTC), and an analog to digital converter (ADC). The data recorder can be a solid state drive. The 284t transmitter circuit can include an amplifier (AMP), a modulator (MOD), and an oscillator (OSC). The receiver circuit 284r can include the amplifier (AMP), a demodulator (MOD), and a filter (FIL). Alternatively, the transmitter 284t and receiver 284r circuits can be combined into a transceiver circuit.
Once the casing column 295 has been deployed, sensor subs 282a, c-f can begin operation. Raw signals from the respective 283p, t sensors can be received by the respective converter, converted, and supplied to the controller. The controller can process the converted signals to determine the respective parameters, the time stamp and recipient parameters, and send the processed data to the respective recorder for storage during the tag's latency. The controller can also multiplex the processed data and supply the multiplexed data to the respective 284t transmitter. The transmitter 284t can then condition the multiplexed data and supply the conditioned signal to the antenna 285t for electromagnetic transmission, such as in radio frequency. Each sensor sub 282c-f can transmit current parameters and some passed parameters corresponding to a data capacity of a communication window between the sensor subs and the tags 280a-c. Once the lower sensor sub 282b is inaccessible to the tags 280a-c due to the upper dart 75u and the upper cleaner 175u, the lower sensor sub will be able to transmit its data to the sensor sub 282a via its transmitter circuit and the antenna. sensor and sub sensor 282a will be able to receive the lower data via its external antenna 285r and receiver circuit 284r. The sensor sub 282a can then transmit its data and the lower data for receipt by tags 280a-c.
The cementing of the inner lining column 295 can be carried out in the same way as the cementing of the inner lining column 295. Instead of keeping the working column 257 unfolded and packing 224p not fixed for the circulation of indicator fluid 130i during curing , the packing can be adjusted immediately after pumping the cement paste 130c. The working column 257 can be retrieved for MODU 201m. A drill string 297 can then be deployed to a depth adjacent to the upper dart 75u. Drill column 297 can include a downhole assembly (BHA) 297h and drill pipe joints 57p connected together, such as by threaded couplings. The BHA 297h can be connected to the drill pipe 57p, such as by a threaded connection, and include a drill 297b and one or more drill commands 297c connected to it, such as by a threaded connection.
The fluid control system 281f can include pumps 30c, a, c, mud sieve 33, flow meters 34c, a, m, r, pressure sensors 35c, a, m, r, throttle 23 , the degassing spool 230, a tag reader 290, and a tag launcher 291. The tag launcher 291 can be mounted as part of the fluid supply line. The tag launcher 291 may include a housing, plunger, actuator, and tank showing a plurality of RFID tags 280a-c-f. The plunger can be movable with respect to the accommodation between a capture position and a release position. The plunger can be moved between positions by the actuator. The actuator can be hydraulic, such as a piston and cylinder assembly and can be in communication with the PLC's HPU. Alternatively, the actuator can be electric or pneumatic. Alternatively, the actuator can be manual, such as a handwheel.
Each RFD tag 280a-c can be an RFID tag for wireless identification and detection platform (WISP). Each 280a-c tag may include an electronics package and one or more antennas housed in a 288 package. The respective components of each 280a-c tag may be in electrical communication with each other by conductors or a bar. Electronics packaging may include a control circuit, a transmitter circuit, and a receiver circuit. The control circuit can include a microcontroller (MCU), the data recorder (MEM), and an RF power generator. Alternatively, each 280a-c tag may have a battery instead of the RF power generator.
Once the 295 drill string has been deployed, the PLC 25 can launch the label terminated with the HPU operation to supply hydraulic fluid to the launcher actuator. The actuator can then move the plunger to the release position (not shown). The carrier and closed label can then be moved to the supply line. The transport fluid 130t discharged by the mud pump 30m can then drive the closed tag from launcher 291 to drill column 297 via upper unit 12 and the Kelly valve 11. Once the closed tag has been released, the actuator can move the plunger back to the capture position and the plunger can load another tank label during movement. The PLC 25 can launch 280a-c tags at a desired frequency.
Once the tag 280a has been circulated through the drill column 297, the tag may come out of the drill 297b in the vicinity of the sensor sub 282a. Tag 280a can receive the data signal transmitted by sensor sub 282a, convert the signal to electricity, filter, demodulate, and record parameters. As the tag 280a travels to the annular crown, tag 280a can communicate with the other sensor subs 282c-f and record data from there. Tag 280c can continue through wellhead 221, PCA 201p, and conductor 250 to RCD 255. Tag 280a can be bypassed by RCD 255 to return line 229r. Tag 280a can continue from return line 229r to tag reader 290.
The label reader 290 can be mounted as part of the return spool. The tag reader may include a housing, a transmitter circuit, a receiver circuit, a transmitter antenna, and a receiver antenna. The housing can be tubular and have ends provided with a flange for connection to other members of the return spool and / or the return line 229r. The transmitter and receiver circuits can be similar to those of the sensor sub 282a. Alternatively, tag reader 290 may include a combined transceiver circuit and / or a combined transceiver antenna. Tag reader 290 can transmit an instruction signal to tag 280a to transmit stored data therefrom. The tag 280a can then transmit the data to the tag reader 290. The tag reader 290 can be sized to have a communications window, such that the cumulative data received from the sensor subs 282a-f can be communicated while tag 280a is flowing through tag reader 290. Tag reader 290 can then relay the cumulative data to PLC 25. OLC 25 can then monitor the cure of cement 130c and / or display the data for an operator can do it. The labels 280a-c can be recovered from the mud screen 33 and reused or can be discarded. The circulation of labels 280a-c can continue during the curing of the 130c cement until completion.
Alternatively, tags 280a-c can be retrieved from the mud sieve 33 and physically transported to an autonomous tag reader. The labels 280a-c may include a magnetic core to facilitate recovery of the mud sieve. Alternatively, a solids separator featuring a label reader can be used in place of the mud screen 33. A vacuum conveyor separator (not shown) may be suitable for having a label reader positioned on the filter belt to read the label as it is separated from the transport fluid 130t. Alternatively, tag reader 290 can be located underwater on PCCA 201p or PCA without conductor 271p and can relay data to PCA via umbilical line 206. Alternatively, tag reader 290 can be located on bypass spool 262 of PCA 261p.
Once cement 130c has been cured, drill column 297 can be operated to pierce darts 75u, n, cleaners 175u, b, collar 108 and shoe 109 in preparation for a completion operation or to further extend well 200 for lower formation 104b or other formation adjacent to the lower formation.
Figures 10A-10C illustrate a corrective cementing operation that is performed using an alternative coating column 305, according to another embodiment of the present invention. The coating column 305 may be similar to the coating column 10t, except for the addition of one or more 300u, m, b stage collars. Alternatively, the jacket column 155 and / or the submarine lining columns 205, 295 can be modified to include stage collars 300u, m, b. Each stage collar 300u, m, can include a housing 310, an opener 311o, a closure 311c, a flow passage 312, a closing member, such as a rupture disc 313, and an expandable seal, such as a bladder 314. Flow passage 312 can be formed in a wall of housing 310. Flow passage 312 can extend from a selective fluid communication inlet with a hole in housing 310 to a bladder inflation chamber 314 and present an output branch in selective communication with the annular crown 110. The rupture disk 313 can be configured to operate at an adjusted pressure corresponding to a bladder inflation pressure 314.
Stage collars 300u, m, b can be arranged along the coating column 305, such that an upper collar 300u located next to the coating hanger, a lower collar 300b located next to the float collar, and an intermediate collar 300m located between the upper and lower collars. The intermediate stage collars 300m and lower 300b can be oriented for a corrective cementing operation and the upper stage collar 300u can be oriented for a seal compression operation (that is, upside down in relation to the intermediate collars and lower).
Stage collars 300u, m, b can be selectively operated in case the cementing and curing operation fails to produce an acceptable result. As shown, the final cement level 320a is substantially below the desired cement level 320i, thus forming a void in the annular crown 110. The void may be due to the cement paste 130c leaving the lower formation 104b (see figures 3D and 3G). While failing, PLC 25 may have at least determined the true final cement level 320a and indicated that cured cement 130c is unacceptable. PLC 25 can also determine the amount of corrective cement 330c needed to fill the void. After curing the cement paste 130c, a working column 357 can be deployed in the well. The working column 357 can include a displacement tool 357s, a sealing head 357h, and a tubular column, such as spiral tubes 357p or drill pipe (not shown). Alternatively, the 300u, m.b stage collars can be operated by profiling or cable. Alternatively, for jacket 155 and submarine linings 205, 295, the respective drill / work columns 57, 257, 297 can include the displacement tool so that the corrective cementing operation can be performed without maneuvers.
The working column 357 can be unfolded until the displacement tool 357s is adjacent to the intermediate stage collar 300m insofar as the lower stage collar 300u can be considered inoperable by wrapping the cured cement 130c. The displacement tool 357s can be extended to engage a profile of the intermediate lock 311o. The displacement tool 357s can then move the intermediate closure 311o longitudinally to an open position, thereby exposing the entry passage. The inflation fluid (not shown), such as conditioner 130w, can be pumped through working column 357 and can be discharged through orifices in the displacement tool 357s to the intermediate passage inlet and along the intermediate passage 312 to the bladder chamber, thereby inflating the bladder 314. Once the bladder 314 has been inflated, the rupture disc 313 may fracture, thereby opening the exit orifice. The inflation fluid can continue to be pumped until fully circulated through an open portion of annular crown 110. Once circulated, corrective cement 330c can be pumped through working column 357 and to annular crown 110 via the stage collar intermediate 300m. Corrective cement 330c can be pumped until a corrective cement level reaches the desired cement level 320i. Once the corrective cement 330c has been pumped, the displacement tool 357s can be operated to engage the closure 311c and move the closure longitudinally (not shown), thus closing the intermediate passage to prevent the counterflow of the corrective cement paste 330c.
During the corrective cementation operation, PLC 25 can monitor and control the conditioning and pumping of corrective cement paste 330c, as discussed above for the primary cementation operation. PLC 25 can also monitor and control healing, as discussed above. Alternatively, the corrective cement paste can be used to inflate the bladder, thus preventing the conditioning step.
Figures 11A-11C illustrate a corrective compression operation that is performed using the alternative coating column 305, according to another embodiment of the present invention. As shown, cured cement 130c has channels 325 forming in it. Channel formation may occur due to infiltration of formation fluid 130f from lower formation 104b (see figures 3C and 3F). Although failing, PLC 25 may at least have determined the infiltration and indicated that cured cement 130c is unacceptable. PLC 25 can also determine the amount of sealer 330s required to fill channels 325.
After the curing of the cement paste 130c, the working column 357 can be unfolded in the well 100. The working column 357 can be unfolded until the displacement tool 357s is adjacent to the upper stage collar 300u. The 357s displacement tool can be operated to open the 300u upper stage collar. Seal 330s can be pumped through working column 357, thereby inflating the upper bladder 314 and opening the outlet. Seal 330s can continue to be pumped into annular crown 110 via upper stage collar 300u until the channeled portion of cement 130c has been impregnated by seal 330s. The upper stage collar 300u can then be closed and the seal 300s can be cured (polymerized), thus filling channels 325.
Sealer 330s can be pumped as a liquid mixture, such as a solution. The solution can include a monomer, such as an ester, a diluent, such as water or seawater and / or alcohol, and a catalyst, such as a peroxide or persulfate. Alternatively, the sealant can be pumped as a paste, such as plaster or mortar.
Additionally, for any of the embodiments discussed above, PLC 25 can detect and adjust the throttling for any transient effects, such as placing the lower wiper (or combination of dart and wiper) on the float collar or placing the lower dart in the bottom cleaner.
Additionally, for any of the embodiments discussed above, PLC 25 can operate mass balance and throttle control during the deployment of linings or jackets in the well. For subsea coating and liner embodiments, PLC 25 can additionally operate mass balance and throttling control during recovery of the work column for drilling equipment (including washing excess cement for the liner embodiment) ).
In addition, for any of the embodiments discussed above, after drilling the well and before removing the drill string, a balanced pill (not shown), such as a quantity of heavy mud, can be pumped (also known as splash) before the drilling system to be configured for cementing operation. The pill can then be circulated while the jacket / jacket is unfolding in the well. A second pill can then be splashed after curing for coating operations or after adjusting the packing for the liner operation.
In addition, for any of the embodiments discussed above, after curing the cement, an integrity test can be performed. For coating embodiments, the annulus can be pressurized using the annulus pump, the annulus can then be trapped and the pressure monitored. For the liner embodiment, the work column can be unfolded with a plug, the plug adjusted to isolate the liner, and the liner can be pressurized and the pressure monitored.
In addition, any of the embodiments discussed above can be used during an obstruction and abandon operation for cement plugs into a hole in a coating column or to cement an annular crown from a coating column after the annular crown has been opened using a profile laminator.
While the foregoing is directed to the embodiments of the present invention, further embodiments of the invention may be developed without departing from its basic scope, the scope of which is determined by the claims presented below.

权利要求:
Claims (25)
[0001]
1. Method of cementing a tubular column in a well, characterized by the fact that it comprises: positioning the tubular column (105) in the well; pump the cement paste (130c) into the tubular column; launch a cement plug (125u) after pumping the cement paste (130c); pushing the cement plug through the tubular column, thus pumping the cement paste (130c) through the tubular column and into an annular crown formed between the tubular column and the well; and controlling the flow of fluid displaced from the well by the cement paste (130c) to control the pressure of the annular crown; and after the cement paste (130c) has been pumped into the annular crown: circular indicator fluid (130i) circulates along a path, the path being in fluid communication with the annular crown; and monitor a parameter of the indicator fluid during its circulation.
[0002]
2. Method according to claim 1, characterized in that the displaced fluid flow is controlled by strangulation.
[0003]
3. Method according to claim 2, characterized by the fact that: the pressure of the annular crown is the bottom pressure of the well, and the choke is adjusted to maintain a bottom pressure as the cement paste (130c) is pumped to the annular crown.
[0004]
Method according to claim 3, characterized in that the strangulation is relaxed as the cement paste (130c) is pumped into the annular crown.
[0005]
5. Method according to claim 3, characterized in that: the choke is loosened as the cement paste (130c) is pumped into a first portion of the annular crown, and the choke is tightened as the cement paste (130c) is pumped into a second portion of the annular crown.
[0006]
6. Method according to claim 3, characterized in that it additionally comprises exerting pressure on the annular crown while adjusting a packing (160p) of the tubular column.
[0007]
7. Method according to claim 1, characterized in that the displaced fluid flow is controlled by pumping.
[0008]
8. Method according to claim 1, characterized in that the displaced fluid flow is controlled by mixing a less dense fluid in it.
[0009]
9. Method according to claim 1, characterized by the fact that: the path has a stagnant branch in fluid communication with the annular crown, and the circulation of the indicator fluid is maintained during the curing of the cement paste (130c).
[0010]
10. Method according to claim 1, characterized by the fact that: the path is through the wellhead (221), and the parameter is monitored by comparing an indicator fluid flow rate to the wellhead with a flow rate of indicator fluid (130i) from the wellhead (221).
[0011]
11. Method according to claim 10, characterized in that it additionally comprises the throttling of the flow of the indicator fluid (130i) from the wellhead (221).
[0012]
12. Method according to claim 11, characterized in that it additionally comprises adjusting the throttling of the indicator fluid (130i) in response to the flow rate comparison.
[0013]
13. Method according to claim 1, characterized in that: the cementation plug (125u) is driven by a displacement fluid (130d), the method additionally comprises: measuring a flow rate of the displacement fluid; and measuring a flow rate of the displaced fluid, and the flow of displaced fluid is controlled using the measured flow rates.
[0014]
14. Method according to claim 13, characterized by the fact that: the well is an underwater well, and an underwater wellhead (221) is located adjacent to the underwater well.
[0015]
15. Method according to claim 14, characterized in that the displaced fluid flow rate is measured with the displacement of the displaced fluid from an orifice of a pressure control assembly (264p) connected to the wellhead (221 ) subsea via a subsea flow meter (234) of the pressure control assembly.
[0016]
16. Method according to claim 14, characterized in that the method is performed without a conductor.
[0017]
17. Method according to claim 1, characterized by the fact that: the tubular column (305) comprises one or more stage collars (300u, m, b), and the method additionally comprises: positioning a working column on the column (357) tubular; open one of the one or more stage collars (300u, m, b) using the work column; and pump the cement paste (130c) or sealant (330s) to the annular crown through the open stage collar.
[0018]
18. Method of cementing a tubular column in a well, characterized by the fact that it comprises: positioning the tubular column in the well, the tubular column comprising one or more cement sensors (161a-f); before pumping the cement paste (130c), establish a communication between the cement sensors (161a-f) and a sampling head (164) located on the surface; pump the cement paste (130c) into the tubular column; launch a cementing plug after pumping the cement paste (130c); pushing the cement plug through the tubular column, thus pumping the cement paste (130c) through the tubular column and into an annular crown formed between the tubular column and the well; and analyzing the data from the cement sensors (161a-f) during the pumping of the cement paste (130c) to the annular crown; and analyze the data from the cement sensors during the curing of the cement paste (130c).
[0019]
19. Method according to claim 18, characterized in that it additionally comprises supplying a pulse from the sampling head to the sensors (161a-f), wherein the sensors comprise capacitance sensors to reflect a return pulse (164r).
[0020]
20. Method of cementing a tubular column in an underwater well, characterized by the fact that it comprises: positioning the tubular column in the subsea well; pump the cement paste (130c) into the tubular column; launch a cementing plug after pumping the cement paste (130c); impelling the cementation plug through the tubular column using a displacement fluid (130d), thus pumping the cement paste (130c) through the tubular column and into an annular crown formed between the tubular column and the underwater well; measuring a displacement fluid flow rate (130d); measure a mass flow rate of the fluid displaced from the subsea well by diverting the displaced fluid from an orifice of a pressure control assembly (201p) connected to an subsea wellhead (221) of the subsea well via a flow meter submarine mass (234) of the pressure control assembly (201p); perform a mass balance using the measured flow rates; and by using mass balance, control a flow of fluid displaced from the well by the cement paste (130c) to control the pressure of the annular crown.
[0021]
21. Method of cementing a tubular column in a well that extends from a wellhead, characterized by the fact that it comprises: positioning the tubular column (105) in the well; pump the cement paste (130c) into the tubular column; launch a cementing plug after pumping the cement paste (130c); pushing the cementation plug through the tubular column, thus pumping the cement paste (130c) through the tubular column and into an annular crown formed between the tubular column and the well; controlling the flow of fluid displaced from the well through the cement paste (130c) to control the pressure of the annular crown; and monitoring the curing of the cement paste (130c), where curing is monitored by the circulation of the indicator fluid (130i) through the wellhead and comparing a flow rate of the indicator fluid to the wellhead with a rate fluid flow indicator from the wellhead.
[0022]
22. Method according to claim 21, characterized in that it additionally comprises the throttling of the flow of the indicator fluid (130i) from the wellhead.
[0023]
23. Method according to claim 22, characterized in that it additionally comprises the adjustment of the throttling of the indicator fluid (130i) in response to the comparison of the flow rate.
[0024]
24. Method of cementing a tubular column in a well, characterized by the fact that it comprises: positioning the tubular column in the well; pump the cement paste (130c) into the tubular column; launching a cement plug after pumping the cement paste (130c); pushing the cement plug through the tubular column, thus pumping the cement paste (130c) through the tubular column and into an annular crown formed between the tubular column and the well; and controlling the flow of fluid displaced from the well by the cement paste (130c) to control the pressure of the annular crown; monitor the cure of the cement paste (130c), in which: the tubular column comprises one or more cement sensors (283p, t), and the cure is monitored by analyzing the data from the cement sensors; position a drilling column in the well after pumping the cement paste (130c); and pump an RFID tag (280a-c) through the drill string and into a second annular ring formed between the drill string and the tubular string, where the RFID tag (280a-c) communicates with the cement sensors (283p , t) while returning through the second annular crown.
[0025]
25. Method according to claim 24, characterized in that: the tubular column comprises a lower sensor sub (282b) and a second sensor sub (282a) located above a landing position of the cementation plug, the lower sensor sub (282b) transmits data to the second sensor sub (282a), and the second sensor sub (282a) relays the data to the RFID tag.

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公开号 | 公开日

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EP3505720A3|2019-09-25|

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AU2012254933B2|2015-04-09|

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EP3748119A2|2020-12-09|

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US20160145995A1|2016-05-26|

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EP3748119A3|2021-01-27|

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EP2594731B1|2019-03-13|

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US9249646B2|2016-02-02|

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BR102012029292A2|2014-12-30|

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EP3505720B1|2020-08-19|

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EP2594731A2|2013-05-22|

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法律状态:
2014-12-30| B03A| Publication of an application: publication of a patent application or of a certificate of addition of invention|

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2015-10-13| B25A| Requested transfer of rights approved|Owner name: WEATHERFORD TECHNOLOGY HOLDINGS, LLC (US) |

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2018-12-04| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|

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2019-10-08| B06U| Preliminary requirement: requests with searches performed by other patent offices: suspension of the patent application procedure|

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2020-05-05| B06A| Notification to applicant to reply to the report for non-patentability or inadequacy of the application according art. 36 industrial patent law|

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2020-09-08| B09A| Decision: intention to grant|

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2020-12-15| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 16/11/2012, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

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申请号 | 申请日 | 专利标题

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US201161560500P| true| 2011-11-16|2011-11-16|

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US61/560,500|2011-11-16|

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