• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A hollow charge (40) for use in a well perforation tool includes a jet blocker (48) disposed in an apex (72) of a parabolic or cone-shaped coating (62). The jet blocker (48) limits the speed and / or length of a jet that forms when an explosive is discharged into the hollow charge (40). The jet blocker (48) may comprise a type of inert casting curing material, such as an epoxy or a flowable plastic, which can be easily inserted into an existing hollow charge (40u) to fill an outer concavity (74) in the coating (62) at any desired height (H). The height (H) and material selected for the jet blocker (48) determine the degree of penetration limitation achieved by the hollow charge (40) and thereby determine which target ring (26) in the wellbore (16) can be penetrated during operation.
    公开号:FR3074833A1
    申请号:FR1860413
    申请日:2018-11-12
    公开日:2019-06-14
    发明作者:Thomas J. Wuensche；Kevin Harive；Thomas E. Burky
    申请人:Halliburton Energy Services Inc；
    IPC主号:
    专利说明:

    This disclosure relates generally to wellbore completions, for example, for wellbores used in the exploration and production of oil and gas. More particularly, embodiments of the disclosure relate to reducing a force of an explosive charge to provide limited penetration into a geological formation, or penetration through a limited number of various layers (casing, coatings, etc. ) arranged in the wellbore.
    Hydrocarbons can be produced in boreholes drilled from a surface location, through a variety of productive and non-productive geological formations. A wellbore may be substantially vertical or may include horizontal and other deviated portions. A variety of maintenance operations can be performed in a borehole after drilling has been completed. For example, a casing train can be fixed and cemented in the wellbore, for example to stabilize the geological formation surrounding the wellbore. A lining can be suspended so as to extend at least partially inside the casing train, and the casing train and / or the covering can be perforated by actuating a perforating barrel or a perforation tool.
    Punching tools may include explosive charges, which can be deployed to an appropriate depth in the wellbore and fired to perforate one or more of the various layers of casing and casing, and / or the geological formation surrounding the well drilling. It is often desirable to create a large perforation in the geological formation of the casing to increase the permeability of the hydrocarbons in the wellbore. In some cases, a limited or controlled explosive charge may be desirable to generate perforations that extend through some, but not all, of the casing layers in the wellbore, for example to promote fluid flow between regions intermediate annulars in the wellbore.
    PRESENTATION
    The aspects of this disclosure described below are provided to describe a selection of concepts in simplified form which are described in more detail in the following sections. The purpose of this section is not to identify the main or essential characteristics of the claimed objects, nor to assist in determining the scope of the claimed objects.
    In one aspect, the present disclosure relates to a shaped charge usable to form a limited penetration perforation in a wellbore. The shaped charge includes a housing, an explosive main charge material disposed within the housing, a coating coupled to the housing and substantially enclosing the explosive main charge material within the housing. The coating defines an external concavity forming a vertex. The shaped charge also includes a jet blocker formed of a solid material extending to a predetermined height above the apex inside the external concavity.
    In one or more exemplary embodiments, the jet blocker may be made of a hardenable material which is introduced into the external concavity and hardened in the external concavity.
    In one or more exemplary embodiments, the jet blocker can comprise at least one of the group of materials consisting of glue, epoxy, acrylic and RTV silicone.
    In one or more exemplary embodiments, the coating may comprise a metallic material forming the external concavity in the form of a cone.
    In one or more exemplary embodiments, a bond can be established between the jet blocker and the coating material by curing the curable material.
    In one or more exemplary embodiments, a jet forming portion of the coating may be substantially free of the solid material forming the jet blocker.
    In one or more exemplary embodiments, the predetermined height may be less than about half of a total height of the external concavity.
    In one or more exemplary embodiments, the shaped charge may further comprise a priming explosive disposed at a priming end of the shaped charge.
    In another aspect, the present disclosure relates to a method of modifying a shaped charge to produce a limited penetration perforation in a wellbore. The method includes (a) providing a shaped charge having a housing, a main charge explosive and a coating defining an external concavity, and (b) forming a jet blocker by fixing a solid material in the concavity external in order to fill a predetermined height of the external concavity so that a jet forming part of the coating is substantially free of the solid material forming the jet blocker.
    In one or more exemplary embodiments, the method may further comprise curing a curing material by casting inside the external concavity from the solid jet blocking material.
    In one or more exemplary embodiments, the method may also include bonding the casting-hardening material to the coating by curing the casting-curing material so as to form a self-supporting jet blocker in the external cavity.
    In one or more exemplary embodiments, the method may further include forming a billet from the solid material away from the shaped charge, and securing the billet in the external concavity to form the jet blocker .
    In one or more exemplary embodiments, the method may further include determining the height by detonating modified shaped charges adjacent to reference casing coupons and empirically determining the penetration characteristics of various shaped charges changed.
    In one or more exemplary embodiments, the empirical determination of the penetration characteristics of various modified shaped charges may include igniting shaped charges with jet blockers having varying heights, densities and ductilities.
    In one or more exemplary embodiments, the method may further include lowering the shaped charge in a wellbore and igniting the shaped charge adjacent to a target ring.
    In one or more exemplary embodiments, igniting the shaped charge adjacent to the target ring may include penetration into the target ring without entering an external element surrounding the target ring.
    In one or more exemplary embodiments, igniting the shaped charge may include collapsing the coating around the jet blocker to form a plug, and further collapsing the coating to form a jet at length and speed coating material.
    In another aspect, the present disclosure relates to a perforation tool system for forming a limited penetration perforation in a wellbore. The perforating tool includes a support body consisting of a cylindrical sleeve, a plurality of shaped charges disposed within the support body, each of the shaped charges having a housing, a main charge explosive and a coating defining a external concavity, and a jet blocker formed in the external concavity of each shaped charge, the jet blocker being formed of a solid material filling a predetermined height of the external concavity, so that a jet forming part of the coating is substantially free of jet blocking material.
    In one or more exemplary embodiments, the perforation tool system may further include a detonating cord extending through the support body and coupled to each of the shaped charges.
    In one or more exemplary embodiments, the punch tool system may also include a conveyor coupled to the support body, the conveyor being operable to lower the support body into a wellbore.
    BRIEF DESCRIPTION OF THE DRAWINGS
    The present disclosure is described in detail below, by way of example only, on the basis of the examples shown in the appended figures, in which:
    Figure 1 is a partial cross-sectional side view of a wellbore system comprising a punching tool according to the present disclosure;
    Figure 2 is an enlarged partial cross-sectional view of the perforation tool of Figure 1 illustrating a hollow charge therein to form a perforation with limited penetration through some, but not all layers of casing in the well drilling ;
    Figure 3 is a cross-sectional view of the shaped charge of Figure 2 in an unmodified configuration to form a perforation with unrestricted penetration, illustrating a housing, an explosive and a coating defining a vertex;
    Figure 4 is a cross-sectional view of the shaped charge of Figure 2 in a configuration modified to form a perforation with limited penetration, illustrating a jet blocker installed in the top of the coating;
    FIGS. 5A to 5E are diagrammatic views in sequence illustrating a jet formed of an unmodified hollow charge to form a perforation with unrestricted penetration;
    FIGS. 6A to 6E are diagrammatic views in sequence illustrating a jet formed by a shaped charge modified to form a perforation with limited penetration; and FIG. 7 is a schematic view of a procedure for planning, modifying and discharging a shaped charge to form a shaped charge with limited penetration according to exemplary embodiments of the present disclosure.
    DETAILED DESCRIPTION
    The present disclosure includes, for example, a shaped charge for use in a well drilling tool. The shaped charge comprises a jet blocker arranged in a top of a parabolic or cone-shaped coating, which limits the speed or the length of a jet formed during the discharge of an explosive into the shaped charge. The jet blocker may include a type of inert casting cure material, such as epoxy or flowable plastic, which can be easily inserted into an existing shaped charge to fill the coating at any desired height. The height and the material chosen for the jet blocker determine the degree of limitation of the penetration obtained by the shaped charge and thus determine which ring in the wellbore can be penetrated during operation.
    Figure 1 is a partial cross-sectional side view of a wellbore maintenance system 10 which includes a punch tool 12 in accordance with exemplary embodiments of the present disclosure. The wellbore maintenance system 10 includes a maintenance platform 14 at a surface location "S". The maintenance platform 14 extends over and around a borehole 16 which penetrates into an underground geological formation “G”. The wellbore 16 can be used for the purpose of recovering hydrocarbons, storing hydrocarbons, rejecting carbon dioxide or the like. The borehole 16 can be drilled in geological formation "G" using any suitable drilling technique. Although illustrated as extending vertically from the surface location "S" in Figure 1, in other examples, the wellbore 16 can be deviated, horizontal or curved over at least some parts of the well 16. The well 16 extends from a land surface location "S", and in other embodiments, a well may extend from an underwater location in other aspects. of this disclosure.
    The wellbore 16, as illustrated in FIG. 1, is cased with an external casing 20 and an internal casing 22. The external casing 20 is fixed in place with cement 24, which fills the annular region located between the casing and the “G” geological formation. The internal casing 22 extends inside the external casing 20 so that a target ring 26 is defined between the internal and external casing 22, 20. In certain exemplary embodiments, the perforation tool 12 can be used to access the target ring 26 without entering the external casing 20. In other embodiments, a wellbore can be configured alternatively, for example, the wellbore can be an open hole, contain a production column, etc., and other regions in the wellbore can be targeted by the punch tool 12.
    The punching tool 12 can be actuated, removed, rotated and otherwise moved in the wellbore 16 by a conveyor 30 extending to the surface location "S". The means of transport 30 can comprise a metal cable, a smooth cable, a coiled tube and / or a drill string, as recognized by a person skilled in the art. The transport means 30, the perforation tool 12 and other devices can be coupled to each other to form a work train 32.
    Figure 2 is an enlarged partial cross-sectional view of the perforation tool 12 comprising a hollow charge 40 therein to form a perforation with limited penetration. Although the shaped charge 40 is illustrated as a deep penetrating charge, it should be noted that certain aspects of this disclosure can be transferred to other types of shaped charges, including shaped charges for large holes or suitable hole, which depend on the collapse of the coating to produce a penetrating jet (see, for example, Figures 5E and 6E).
    An explosion of the shaped charge 40 results in a passage 44 which extends through the inner casing 22 to the target ring 26, but not through the outer casing 20. In other embodiments, a passage that penetrates all the casing layers and the cement layers in a wellbore and extends into the surrounding geological formation "G" could be formed. The size and / or the length of the passage can be reduced, limited or controlled by a jet blocker 48 carried by the shaped charge 40.
    The perforation tool 12 comprises a support body 50 consisting of a cylindrical sleeve. In the illustrated embodiment, the support body 50 optionally comprises a plurality of reduced zones radially described in the form of serrations or recesses 52. A respective hollow charge among a plurality of hollow charges 40 is aligned radially with each of the recesses 52 , only one of which is illustrated in FIG. 2. A discharge end 56 of the hollow charge 40 is disposed adjacent to the recess 52, and a priming end 58 of the hollow charge 40 is disposed adjacent to a detonating cord 54 extending through the perforation tool 12. The detonating cord 54 may consist of an explosive strand, such as a Primacord®, which can be ignited to thereby detonate each of the hollow charges 40 in the punching tool 12.
    Each of the hollow charges 40 is aligned longitudinally and radially with one of the recesses 52 in the body of the perforation barrel 102 when the perforation tool 12 is assembled. The shaped charges 40 can be arranged in a spiral pattern so that each of the shaped charges 40 is arranged at its own level or at its own height and must be fired individually so that a single shaped charge 40 is set fire at a time. It will be understood, however, that alternative arrangements of shaped charges 40 may be used, including cluster type designs where multiple shaped charges 40 are at the same level and are ignited at the same time, without departing from the principles of this disclosure. .
    Referring now to Figure 3, a shaped charge 40u is illustrated in an unmodified configuration to form a perforation with unrestricted penetration. The unmodified shaped charge 40u includes a housing 60, a coating 62 and an explosive main charge material 64 disposed between the coating 62 and the housing 60. A priming explosive 68 may be disposed at the priming end 58 of the hollow charge 40u and can facilitate the coupling of the main charge explosive material 64 to the detonating cord 54 (FIG. 2).
    The housing 60 functions to protect the internal explosive materials 64, 68 during the handling and storage of the hollow charge 40u and provides a mass against which the explosion can react during operation. The housing 60 can be made for example of steel or another suitable material. The covering 62 can be fixed to the housing 60 by a drop of glue or another mechanical mechanism defined between a covering skirt 70 and the housing 60. The covering 62 can be made of any suitable material, including metallic materials , for example brass, copper, steel, aluminum, zinc, lead and tungsten (or combinations thereof and other suitable materials). The coating 62 is generally parabolic or cone-shaped, so that a vertex 72 is defined at an innermost end of an external concavity 74 of the shaped charge 40u. The hollow charge 40u can generally depend on a collapse of the covering 62 to develop a high speed jet in order to create tunnels or passages in the geological formation "G" (figure
    1) during a perforation event. Often, unmodified shaped charges 40u are provided with at least a portion of the coating 62 made of a dense material which is present in this jet at high speed. The energy thus transferred to the dense material can be more effectively concentrated to promote deeper tunnels.
    FIG. 4 is a cross-sectional view of the limited penetration hollow charge 40, which can be formed from the unmodified configuration (FIG. 3) by the installation of the jet blocker 48. In certain embodiments, the jet blocker 48 is a solid billet, plastic or metal, machined to an appropriate size and shape, then fixed in concavity 74. Jet blocker 48 can be made of a material similar to a coating material 62 or separate from the coating material 62. In certain embodiments, the jet blocker 48 can be made of a type of material which hardens by casting, such as glue, epoxy, acrylic, RTV silicone. or a similar material, which can flow into the top 72 of the covering 62 at any desired height "H". As described in more detail below, the height "H" can be predetermined to limit the force generated by the shaped charge 40 during the detonation. Thus, a specific target ring 26 (FIG. 2) can be penetrated without penetrating into a layer of casing or into another structure surrounding the target ring 26. In certain embodiments, the height "H" can be less than approximately the half of a total height "TH" defined by the external concavity 74.
    The jet blocker 48 can take the shape of the top 72 of the coating without requiring machining and can then be hardened to bond to the coating 62. An adhesive bond can be established between the jet blocker 48 and the coating 62, either by because of the hardening of the hardening material by casting, or by an additional adhesive if necessary. The jet blocker 48 can thus be fixed in place without the need for additional protection, which could disturb the operation of the shaped charge. Preferably, the jet blocker 48 can generally comprise light materials so that the vulnerability of the hollow charge 40 to vibrations degrades as the perforation tool 12 (FIG. 1) is introduced into the wellbore 16.
    The coating 62 includes a jet producing region 76 between the jet blocker 48 and the discharge end 56 of the shaped charge 40. The jet producing region 76 of the coating 62 is substantially free of jet blocking material. As described below (see Figure 6C), the jet producing region 76 can collapse on itself during detonation to produce a jet.
    FIGS. 5A to 5E are diagrammatic views in sequence illustrating a jet 80 formed from an unmodified hollow charge 40u to form a perforation with unrestricted penetration. At the start or just after the detonation (FIG. 5A), the housing 60 and the coating 62 are generally intact. An explosive wave advances through the main charge explosive 64 from the priming end 58 to the discharging end 56. When the melt reaches the top 72 of the covering 62, the covering 62 collapses radially inwards and forms an initial jet (FIG. 5B) 82. After a time interval, for example of 20 microseconds, after the detonation, (FIGS. 5C and 5D), the coating 62 continues to collapse and the casing 60 begins to separate in fragments 84. After a longer time interval, for example 50 microseconds, the coating 62 has completely collapsed and the complete jet 80 may extend over a length "L" towards or in the geological formation "G" ( figure 1). The jet 80 can move at a relatively high speed, for example 20,000 feet / second, through the casing, the cement and the geological layers, forming perforations and passages inside them.
    FIGS. 6A to 6E are diagrammatic views in sequence illustrating a jet 90 formed by a shaped charge 40 modified to form a perforation with limited penetration.
    At the start or just after the detonation (FIG. 6A), the housing 60, the coating 62 and the jet blocker 48 are generally intact. As the explosive ground advances towards the summit 72 (FIG. 6B), the coating 62 collapses and envelops the jet blocker 48 so that a plug 92 of relatively low density is formed in the coating material which collapses. The jet blocker 48 prevents the formation of an initial jet 94 of coating material until a time interval, for example 20 microseconds, has elapsed after the detonation (Figure 6C). The jet 94 does not form until the coating material collapses on itself between the zone beyond the plug 92. The coating 62 continues to collapse and the housing 60 separates into fragments 96 ( Figure 6D). After a longer time interval, for example 50 microseconds and once the coating 62 has completely collapsed, the jet 90 can extend over a reduced length "1" relative to the length "L" of the jet 80 (Figure 5E). The jet 90 can also move at a relatively low speed compared to the jet 80. As the jet 90 is slower and shorter than the jet 80, the jet 90 produces a reduced penetration effect. For example, the jet 90 can transmit relatively low energy to the internal casing 22 (FIG. 2) so that the jet 90 only penetrates a specific predetermined number of layers of casing in the wellbore 16. For example, the jet 90 can penetrate only into the internal casing 22 without penetrating into the external casing 20 to form a passage 44 which extends only towards the target ring 26.
    FIG. 7 is a schematic view of a procedure 100 for planning, modifying and discharging a shaped charge 40 to form a shaped charge with limited penetration 40 according to exemplary embodiments of the present disclosure. Initially at step 102, the procedure 100 begins by determining a height “H” for a jet blocker 48 which will produce the specific specific limited penetration effect expected. The height "H" can be determined empirically. For example, various modified shaped charges 40 having various coating materials and configurations can be tested by detonating a modified shaped charge adjacent to reference casing coupons to determine the penetration characteristics of the various shaped charges 40. Height "H Jet blocker 48 can be modified and tested, and the particular material of jet blocker 48 can also be modified and tested. For example, different jet blocker materials having different densities, ductility and other material characteristics can be tested. Intermediate values can be interpolated and / or estimated on the basis of empirical tests. A dataset of the limited penetration effects of various modified shaped charges 40 can thus be assembled.
    Then, in step 104, when an actual application requiring limited penetration perforation occurs, the required actual limited penetration effect is identified. For example, the exact casing scenario can be evaluated and a target ring 26 can be identified. Then, the procedure 100 goes to decision 106 where it is determined whether the data set assembled in step 102 includes the limited penetration effect identified in step 104. If no jet blocker 40 which would produce the limited penetration effect required has not been tested, procedure 100 can then return to step 102 where additional tests can be performed. For example, a higher height "H" of a jet blocker 48 can be tested if a lower force is required, and a lower height "H" can be tested if a higher force is required compared to that of the jet blockers test 48 previously tested were supposed to provide.
    If a jet blocker 10 which would produce the required limited penetration effect has been tested, then the procedure proceeds to step 108. An unmodified shaped charge 40u which includes a coating 62 defining a vertex 72 may be provided. The unmodified shaped charge 40u can be, for example, a commercially available shaped charge with known or documented penetration characteristics.
    Then, these known or documented penetration characteristics can be limited or reduced in step 110 by the formation of a jet blocker 48 in the internal concavity 74 of the unmodified hollow charge 40u. In some embodiments, the jet blocker 48 is formed by first forming a billet from the solid material at a distance from the shaped charge 40, then by fixing the billet in the external concavity 74 to form the jet blocker 48 The billet can be formed, for example, by machining a blank of metal or plastic to have the appropriate height "H", then the billet can be fixed in the concavity 74 by an adhesive or by another mechanism.
    Furthermore, to form the jet blocker 40, a material with hardening by casting can be poured into the external concavity 74 to cover the crown 72 and up to the height “H” predetermined in step 102. It can be left to harden the material hardening by casting allowing it to bind to the coating 62 to thereby form the jet blocker 48. The jet blocker 48 can then be self-supporting in the coating 62, without major redefinition of the unmodified hollow charge 40u. The jet blocker 48 can be supported vertically in the external concavity when the melt-hardening material hardens.
    The resulting shaped charge 40 can then be lowered in a wellbore 16 to a downhole location adjacent to a target ring (step 112). The hollow charge 40 can then be ignited in the borehole 16 to penetrate into the target ring 26 without penetrating into the external casing 20 surrounding the target ring 26.
    Although various examples have been illustrated in detail, the present disclosure is not limited to the examples presented. Modifications and adaptations of the above examples can be understood by those skilled in the art. Such modifications and adaptations are within the scope of this disclosure.
    权利要求:
    Claims (15)
    [1" id="c-fr-0001]
    1. Hollow charge (40) usable to form a perforation with limited penetration in a wellbore (16), characterized in that the hollow charge (40) comprises:
    a housing (60);
    an explosive main charge material (64) disposed within the housing (60);
    a coating (62) coupled to the housing (60) and substantially enclosing the main charge explosive material (64) inside the housing (60), the coating (62) defining an outer concavity (74) forming a vertex (72 ); and a jet blocker (48) formed of a solid material extending to a predetermined height (H) above the apex (72) inside the external concavity (74).
    [2" id="c-fr-0002]
    2. shaped charge (40) according to claim 1, wherein the jet blocker (48) consists of a hardenable material which is introduced into the external concavity (74) and hardened inside the external concavity (74 ).
    [3" id="c-fr-0003]
    3. Hollow charge (40) according to claim 2, in which the jet blocker (48) comprises at least one of the group of materials consisting of glue, epoxy, acrylic and RTV silicone, and optionally in which the coating (62) comprises a metallic material forming the cone-shaped external concavity (74).
    [4" id="c-fr-0004]
    4. A shaped charge (40) according to claim 2 or 3, wherein a connection is established between the jet blocker (48) and the coating material by curing the curable material.
    [5" id="c-fr-0005]
    5. A shaped charge (40) according to any one of the preceding claims, wherein a jet forming portion of the coating is substantially free of the solid material forming the jet blocker (48).
    [6" id="c-fr-0006]
    6. shaped charge (40) according to any one of the preceding claims, in which the predetermined height (H) is less than about half of a total height (TH) of the external concavity (74).
    [7" id="c-fr-0007]
    7. A shaped charge (40) according to any one of the preceding claims, further comprising a priming explosive (68) disposed at a priming end (58) of the shaped charge (40).
    [8" id="c-fr-0008]
    8. Method for modifying a hollow charge (40) to produce a perforation with limited penetration in a wellbore (16), characterized in that the method comprises:
    providing a shaped charge (40u) having a housing (60), a main charge explosive (64) and a coating (62) defining an external concavity (74); and forming a jet blocker (48) by fixing a solid material in the external concavity (74) to fill a predetermined height (H) of the external concavity (74) so that a jet forming portion of the coating (62) is substantially free of the solid material forming the jet blocker (48).
    [9" id="c-fr-0009]
    The method of claim 8, further comprising curing a curing material by casting inside the external concavity (74) from the solid jet blocking material, and optionally further comprising bonding the material. hardening by casting to the coating by hardening the hardening material by casting so as to form a self-supporting jet blocker (48) in the external concavity (74).
    [10" id="c-fr-0010]
    10. The method of claim 8 or 9, further comprising forming a billet from the solid material at a distance from the hollow charge (40), and fixing the billet in the external concavity (74) to form the jet blocker (48).
    [11" id="c-fr-0011]
    11. A method according to any one of claims 8 to 10, further comprising determining the height (H) by detonating modified shaped charges (40) adjacent to reference casing coupons and by empirically determining the penetration characteristics of various modified shaped charges (40), and optionally wherein the empirical determination of the penetration characteristics of various modified shaped charges (40) includes igniting shaped charges (40, 40u) with jet blockers ( 48) having various heights (H), densities and ductilities.
    [12" id="c-fr-0012]
    12. A method according to any one of claims 8 to 11, further comprising lowering the hollow charge (40) in a wellbore (16) and igniting the hollow charge (40) adjacent to a target ring (26).
    [13" id="c-fr-0013]
    13. The method of claim 12, wherein either (i) igniting the shaped charge (40) adjacent to the target ring (26) comprises penetrating into the target ring (26) without penetrating an element external (20) surrounding the target ring (26) and / or (ii) igniting the shaped charge (40) comprises the collapse of the coating (62) around the jet blocker (48) to form a plug (92), and the additional collapse of the coating (62) to form a jet of limited length and speed of the coating material.
    [14" id="c-fr-0014]
    14. A perforation tool system for forming a perforation with limited penetration in a wellbore (16), characterized in that the perforation tool comprises:
    a support body (50) consisting of a cylindrical sleeve;
    a plurality of shaped charges (40) disposed within the support body (50), each of the shaped charges (40) having a housing (60), a main charge explosive (64) and a coating (62) defining an external concavity (74); and a jet blocker (48) formed in the external concavity (74) of each hollow charge (40), the jet blocker (48) being made of a solid material filling a predetermined height (H) of the external concavity ( 74), so that a jet forming portion of the coating (62) is substantially free of jet blocking material.
    [15" id="c-fr-0015]
    15. A perforation tool system according to claim 14, further comprising either (i) a detonating cord (54) extending through the support body (50) and coupled to each of the shaped charges (40) and / or (ii) a transport means (30) coupled to the support body (50), the transport means (30) being operable to lower the support body (50) into a wellbore (30).
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    法律状态:
    2019-11-29| PLFP| Fee payment|Year of fee payment: 2 |
    2020-05-08| PLSC| Publication of the preliminary search report|Effective date: 20200508 |
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    申请号 | 申请日 | 专利标题
    USPCT/US2017/065848|2017-12-12|
    PCT/US2017/065848|WO2019117874A1|2017-12-12|2017-12-12|Limited penetration shaped charge|
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