• 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:
    The invention relates to a method for cleaning a wellbore. According to the method, the pumping devices (17) located in the wellbore (10) are removed. In addition, an inner pipe (21) is installed in the borehole (10), which extends to the bedrock (13). The inner pipe (21) is sealed against the wellbore (10) by first filling the space (23) between the wellbore (10) and the inner pipe (21) with sealant (24) and then expanding a part of the end part (25) of the inner pipe (21) firmly against the wellbore. (10).
    公开号:FI20205027A1
    申请号:FI20205027
    申请日:2020-01-13
    公开日:2021-02-26
    发明作者:Juha Vaittinen
    申请人:Lamminranta Oy；
    IPC主号:
    专利说明:

    The invention relates to a method for rehabilitating a borehole, in which method the pumping means in the borehole are removed and an inner pipe extending up to the bedrock is installed in the borehole.
    The borehole includes a drilled hole that extends through the topsoil to the bedrock.
    The hole is drilled until groundwater is reached.
    In Finland, the surface area is usually from a few meters to a few tens of meters.
    In bedrock, the depth of the hole is usually several tens of meters, up to two hundred meters.
    A protective pipe will be installed on the section of the topsoil, which will be extended some distance into the bedrock.
    An attempt is made to place the protective pipe tightly in the bedrock in order to prevent soil and surface water from flowing into the borehole.
    The iron pipe traditionally used in drilling forms a protective pipe, which is also extended to some extent into the bedrock.
    Still, dirty surface water can drain into the borehole.
    In addition, as the water level varies and over time, iron oxide can be released from the iron pipe into the water, which can cloud the water and cause taste changes.
    There are two known methods for rehabilitating such a borehole.
    One way to repair the well O 25 is to replace the old stainless steel pipe with a stainless steel pipe 5.
    That is, the iron tube is first removed, which e is time consuming.
    In addition, the sealing of the steel pipe to the bedrock z is as uncertain as that of the original iron pipe.
    Another means N is to install a plastic pipe, S 30, inside the iron pipe as an inner pipe, which is sealed to the iron pipe.
    It is practically impossible to make a tight seal N because the N expandable seal used in the seal shrinks as it dries.
    In this case, the seal can even come off and fall deeper into the borehole, whereby there is no seal at all between the iron pipe and the inner pipe.
    Täl-
    I hit rusty water can still be a problem. The plastic pipe may also be too narrow for the previous submersible pump, which must therefore be replaced during renovation.
    The object of the invention is to provide a novel method for rehabilitating a borehole, which is even simpler, but in which the renovation is simpler than before with the end result being permanent. The characteristic features of the method according to the invention appear from the appended claims. The method according to the invention solves the problems of the prior art. First, the rust of the water disappears. At the same time, soil and surface water are prevented from entering the borehole. In addition, the result is maintained despite changes in the water level and the renovation itself is rapid.
    The invention will now be described in detail with reference to the accompanying drawings illustrating an embodiment of the invention, in which Figure 1 shows a borehole known as a schematic drawing, Figure 2a shows the initial stage of the method according to the invention, Figure 2b shows the middle stage of the method according to the invention. Fig. 4a shows an apparatus used in the method according to the invention, Fig. 4b shows an inner tube used in the method according to the invention. x a N Figure 1 shows a known borehole 10 previously drilled and in use S 30, which can be rehabilitated by the method N according to the invention. The borehole 10 includes a drilled borehole N 11 extending through the topsoil layer 12 to the bedrock 13. The borehole 11 has been drilled until groundwater is reached. A protective pipe 22 is usually installed on the surface
    ka also extends some distance into the bedrock 13. An attempt has been made to place the protective pipe tightly in the bedrock in order to avoid soil and surface water entering the borehole. An installation well 15 extending below the frost boundary 14 is formed at the upper end of the borehole 10 and is insulated to prevent the borehole and water line 16 from freezing. A submersible pump 18 with a hose 19 and a cable is lowered into the borehole 10 as pumping means 17. The mounting well 15 has the necessary connectors, 10 usually an angle connector 20 for the hose 19. During operation, power is supplied by the cable to the submersible pump, from which water rises through the hose 19 to the installation well 15 and further to the application. After installation, the end of the protective tube 22 is plugged and the installation well 15 is insulated and closed to prevent freezing.
    The invention relates to a method for rehabilitating a borehole. In the method, the pumping means 17 in the borehole 10 are first removed. Usually a hose and a cable are connected to the submersible pump. During the renovation, an inner pipe 21 is installed in the borehole 10, which extends to the bedrock 13. Figures 2a to 3 show a protective tube 22 previously installed in a borehole 10 and an inner tube 21 according to the invention. Both tubes extend into the bedrock 13. According to the invention, the inner tube 21 is sealed in the borehole 10 by first filling the space between the borehole 10 and the inner tube 21 O 25. 23 with sealant 24. After filling, a part of the end part 25 of the inner tube 21 is expanded into the borehole e 10.
    E N A steel pipe made of stainless steel S 30 or acid-resistant is installed as the inner pipe 21. This avoids water rust because nothing dissolves from the N steel pipe and the steel pipe does not corrode. N The steel pipe can also be formed from pipe sections 26 with sleeves for making connections (Fig. 4b). Alternatively, straight pipe sections are used, which are connected to each other in bulk.
    27. In both cases, the pipe sections and sleeves are riveted together. The sealant then eventually seals even small cracks.
    Preferably, the characteristics of the end portion 25 of the inner tube 21 are different from the rest of the portion. For example, the wall thickness of the € end section is lower than elsewhere in the inner tube. On the other hand, the end part may be of a material other than steel. This makes it easier to shape the end part and the end part adapts to the surface shapes of the borehole wall. Expansion increases the tightness of the structure and prevents leakage of sealant.
    In relation to the depth of the borehole, it is sufficient to extend the inner tube a short distance in order to carry out the invention. In the invention, the inner tube 21 is widened by a distance L of 50 to 500 mm, more preferably 100 to 300 mm. In this case, the distance to be formed is short but sufficient. Preferably, the expansion is performed in one step.
    In the embodiment shown, the inner pipe 21 is installed in the borehole 10 inside the iron pipe 22 as a protective pipe 22, whereby the space 23 between the inner pipe 21 and the iron pipe is filled with sealant 24. Thus, removing the previously installed iron pipe is unnecessary. At the same time, however, the iron pipe is insulated from the water, so that no rust enters the water. The sealant can also enter the space between the protective tube 22 and the bore 11, which only increases the z tightness. Of course, the protective tube can be removed before installing the inner tube N. Correspondingly, the inner pipe can be installed and sealed in a new borehole, whereby the run-off of surface water into the borehole can be completely prevented.
    N Surprisingly, the sealant 24 is fed from the bottom up. In this case, the sealant safely travels to the point where the sealant
    is needed. Preferably, the feeding is continued until the sealant is discharged to the upper end of the inner tube. In this case, the inner tube is sealed all the way. In the invention, pumpable concrete is used as the sealant 24. Concrete is easy to handle and virtually non-toxic. In addition, with a suitable composition and additives, the ketone is easily pumped and the concrete hardens quickly. For example, with a suitable accelerator, the hardening of the concrete can be accelerated. The invention uses a tool 28 for sealing, which in Figure 4a is lowered into the borehole 10. More generally, the inner tube 21 is expanded by a tool 28 which is lowered from above into the end portion 25 of the inner tube 21 inside the inner tube 21. Figure 4a does not show the actual pipes. In Figure 2a, the inner tube 21 is at a suitable location slightly below the protective tube 22. In addition, the tool 28 has already been lowered to a suitable depth. The tool can be installed in a borehole together with an inner pipe. In this case, both the inner tube and the tool can be installed in one work step. At the same time, the tool is easy to align with the end of the inner tube to the right position. Alternatively, the inner tube is first installed, after which the tool O 25 is lowered into the inner tube. In the invention, two cuffs 29 and 30 are fitted to the tool 28, which are arranged at a distance e from each other. Both cuffs have their own functions, and with the co-operation of the cuffs, sealing can be performed simply and quickly. O 30
    S N According to Fig. 2a, the upper cuff 29 is placed at the end portion 25 of the inner tube N 21 and the lower cuff 30 below the end portion 25. In addition, the inner tube 21 extends lower than the protective tube 22.
    The cuffs can be used independently of each other. In other words, the properties of the cuffs can be adjusted independently. Figure 2a shows two connections 31 and 32 to which medium hoses (not shown) are connected. Compressed air, for example, is used as the medium. The left joint 31 extends into the upper cuff 29 and the right joint 32 extends into the lower cuff 30. In Figures 2a and 2b, the upper cuff 29 is sealed to the inner tube 21 and the lower cuff 30 is sealed to the bedrock 13. The sealant 24 is then fed into the space between the cuffs 29 and 30. together through 33 (Figure 2b). The third joint 33 extends through the upper cuff 29 and opens between the cuffs 29 and 30. The cuffs prevent the sealant from flowing down into the borehole and on the other hand from entering the inner tube 21. Thus, as the pumping continues, the sealant rises between the protective tube 22 and the inner tube 21. Some sealant may also pass between the protective tube 22 and the bore 11. Pumping is continued until the sealant is discharged into the protective tube in the area of the upper end.
    Figure 3 shows a partial enlargement of the compaction point at the end of the method. After supplying the sealant 24, the upper cuff 29 extends the end portion 25o of the inner tube 21 into the bedrock 13, after which the tool 28 is removed from the borehole. Here, only the upper cuff 29 is shown, with which the inner tube 21 is expanded into the bore hole 11. The expansion prevents the sealant from draining. In this case, the pressure z of the cuff can be quickly removed and the tool can be lifted out of the borehole, which shortens the time required for renovation. If necessary, allow the cuff to remain in place until the concrete has hardened. The invention uses a sealant and finally the inner tube is extended to the bedrock. In this case, the sealing is
    must hold.
    At the same time, the removal of the protective pipe is avoided, which speeds up the rehabilitation of the borehole.
    The cuff is a cylinder about 500 mm long with a strong rubber shaft.
    When pressurized, the cylinder shortens, compressing the rubber in the longitudinal direction, whereby the rubber expands, condensing on the walls of the pipe or borehole and preventing the sealant from escaping.
    The invention utilizes pressure even further.
    In the initial stage, both cuffs are pressurized, whereby the upper cuff condenses into the inner tube and the lower cuff into the bedrock, i.e. the borehole.
    Finally, the pressure of the upper cuff is further increased, whereby the end of the end part of the inner tube expands, condensing into the bedrock.
    At the same time, the leakage of sealant into the borehole is prevented.
    After expansion, the double cuff is removed from the borehole and the submersible pump is reinstalled.
    Preferably, concrete is used as the sealant, which is pumpable but hardens rapidly.
    In this case, the seal is maintained even when conditions change.
    As an aid, a motorized undercarriage 34 can be used, which includes means for generating compressed air and devices 36 for mixing and pumping concrete.
    The base machine 34 is preferably crawler, in which case the borehole can be reached without breaking the surface soil.
    Concrete output depends on the inner tube diameter O 25 and length.
    However, the volume to be compacted is usually a few tens of liters, so the material consumption is low.
    In addition, the concrete to be pumped passes through even small cracks z, effectively compacting. a N 30 The tool shown can also be used to pressurize a borehole.
    By using two cuffs, the space into which the water is fed at high pressure is limited in the borehole.
    In this case, the water vessels can be opened and thus improved water production.
    Between the supply of sealant and the pressure opening, the tool is cleaned, which must, however, be done after the renovation in any case. The method according to the invention can be used modified to form a new borehole. In this case, a steel pipe is installed as a protective pipe, which is concreted into a borehole. Finally, the end of the steel pipe is widened to the bedrock, which prevents the concrete from leaking. After the concrete has hardened, the steel pipe stays tightly in place.
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    权利要求:
    Claims (15)
    [1]
    A method of cleaning a well, according to which the pumping devices (17) present in the well (10) are removed and an inner pipe (21) is installed in the well (10), which extends to the bedrock (13), characterized by sealing the inner pipe (21) to the wellbore (10) by first filling the space (23) between the wellbore (10) and the inner pipe (21) with sealing means (24) and then expanding a part of the end part (25) of the inner pipe (21) firmly against drilling well (10).
    [2]
    Method according to Claim 1, characterized in that a adjusting pipe, which is stainless or oxygen-resistant, is mounted as the inner tube (21).
    [3]
    Method according to Claim 1 or 2, characterized in that the properties of the end part (25) of the inner tube (21) deviate from the rest of the part.
    [4]
    Method according to one of Claims 1 to 3, characterized in that the inner pipe (21) is installed in the borehole (10) inside an iron pipe which acts as a protective pipe (22), and the space (23) between the inner pipe (21) and the protective tube (22) is filled with sealant (24).
    N 2
    [5]
    Method according to one of Claims 1 to 4, characterized in that the sealing agent (24) is fed in from below. and KK
    N 3 30
    [6]
    Method according to Claim 5, characterized in that pumpable concrete is used as the sealant (24).
    N
    [7]
    Method according to one of Claims 1 to 6, characterized in that the inner tube (21) widens along the section (L), which is 50 to 500 mm, preferably 100 to 300 mm.
    [8]
    Method according to one of Claims 1 to 7, characterized in that the inner tube (21) is expanded with a tool (28), which is lowered from above to the end part (25) of the inner tube (21) inside the protective tube (21).
    [9]
    Method according to claim 8, characterized in that the tool (28) is lowered into the wellbore (10) together with the inner pipe (21).
    [10]
    Method according to Claim 8 or 9, characterized in that two cuffs (29, 30) are arranged on the tool (28), which are arranged at a distance from one another.
    [11]
    Method according to claim 10, characterized in that the upper sleeve (29) is placed at the end part (25) of the inner tube (21) and the lower sleeve (30) below the end part (25).
    [12]
    Method according to claim 11, characterized in that the upper cuff (29) is sealed against the inner tube (21) and the lower cuff (30) is sealed against the bedrock (13), after which sealant (24) is fed into the space between the cuffs. N (29, 30).
    [13]
    Method according to claim 12, characterized in that N after the insertion of sealant (24) into the end part (25) of the inner tube (21) is extended with the upper sleeve (29) towards the bedrock N (13), after which the tool (28) is removed from the wellbore N (10).
    [14]
    Method according to one of Claims 1 to 13, characterized in that the inner tube (21) is formed by tube parts (26).
    [15]
    Method according to Claim 14, characterized in that the pipe parts (26) are joined to one another by means of riveting.
    oO
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    同族专利:
    公开号 | 公开日
    SE2150019A1|2021-07-14|
    NO20210043A1|2021-07-14|
    FI128909B|2021-02-26|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2021-02-26| FG| Patent granted|Ref document number: 128909 Country of ref document: FI Kind code of ref document: B |
    优先权:
    申请号 | 申请日 | 专利标题
    FI20205027A|FI128909B|2020-01-13|2020-01-13|Method for bore well renovation|FI20205027A| FI128909B|2020-01-13|2020-01-13|Method for bore well renovation|
    NO20210043A| NO20210043A1|2020-01-13|2021-01-12|Method for rehabilitating a drilled well|
    SE2150019A| SE2150019A1|2020-01-13|2021-01-13|PROCEDURE FOR DELIVERING THE DRILL|
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