Casing patching device

Abstract

The invention provides a casing patching device. The casing patching device comprises a supporting assembly; the patching pipe is movably arranged on the supporting assembly in a sleeving mode; the expansion assembly is arranged on the supporting assembly and located between the inner wall of the patching pipe and the supporting assembly, and the expansion assembly has an expansion state and a contraction state; under the condition that the expansion assembly is in the expansion state, the expansion assembly abuts against the inner wall of the patching pipe, so that the inner diameter of the patching pipe is increased; and under the condition that the expansion assembly is in the contraction state, the expansion assembly is separated from the inner wall of the patching pipe, so that the patching pipe and the supporting assembly can move relatively. According to the casing patching device, the size of the expansion assembly can be flexibly changed, the inner diameter of the patching pipe can be conveniently expanded to different degrees in actual application, then the adaptability of the casing patching device to a casing deformation well can be improved, the inner diameter loss after the to-be-repaired casing is repaired is reduced, the pressure bearing performance after the to-be-repaired casing is repaired is guaranteed, and the service life of the casing patching device is prolonged. And a reliable guarantee is provided for utilization rate improvement after old well repair.

Description

Technical Field

[0001] The present disclosure relates to the technical field of wellbore repair, and in particular to a casing patch device. Background Art

[0002] During the oilfield development process, the casing repair technology can restore the original production capacity of some wells that have stopped production due to casing damage, meet the production needs of oil and gas wells, and improve the underground development well pattern without drilling new wells or sidetracks. It is an effective process measure for repairing damaged casing wells during the mid-late stage of oilfield development, which helps to improve the utilization rate of old wells. In practical applications, methods such as cement squeezing and casing patching are often used for casing repair. However, in practical applications, it is found that due to the influence of formation absorption capacity, cement slurry is likely to fail to be squeezed into the formation or there may be phenomena such as squeezing and channeling during cement squeezing, resulting in poor pressure-bearing capacity after casing repair, and it is easy to increase the occurrence probability of quality problems and engineering accidents during the construction process; existing casing patching methods often have problems such as serious loss of casing inner diameter and low pressure-bearing performance after patching, which affect the development and utilization of old wells after repair, and have poor applicability to casing deformation wells. Summary of the Invention

[0003] The present disclosure aims to at least solve one of the technical problems existing in the prior art or related technologies.

[0004] In view of this, according to an embodiment of the present disclosure, a casing patch device is provided, including:

[0005] A support assembly;

[0006] A patch pipe movably sleeved on the support assembly;

[0007] An expansion assembly disposed on the support assembly and located between the inner wall of the patch pipe and the support assembly, the expansion assembly having an expanded state and a contracted state;

[0008] Wherein, when the expansion assembly is in the expanded state, the expansion assembly abuts against the inner wall of the patch pipe to increase the inner diameter of the patch pipe; when the expansion assembly is in the contracted state, the expansion assembly is separated from the inner wall of the patch pipe to enable relative movement between the patch pipe and the support assembly.

[0009] In a feasible embodiment, the expansion assembly includes:

[0010] A central pipe disposed on the support assembly, the support assembly being formed with a hydraulic channel, and the interior of the central pipe being in communication with the hydraulic channel;

[0011] An expansion member disposed on the central pipe, the expansion member being located between the outer wall of the central pipe and the patch pipe, and a liquid injection cavity being formed between the expansion member and the central pipe, the liquid injection cavity being in communication with the interior of the central pipe;

[0012] Among them, the expansion member is made of a flexible material.

[0013] In a feasible embodiment, the Shore hardness of the expansion member is greater than or equal to 80 HA and less than or equal to 90 HA; and / or

[0014] The tensile strength of the expansion member is greater than or equal to 240 kg / cm 2 ; and / or

[0015] The elongation at break of the expansion member is greater than or equal to 200%.

[0016] In a feasible embodiment, the expansion member includes:

[0017] A flexible layer disposed on the central tube, and a liquid injection cavity is formed between the flexible layer and the central tube. The flexible layer is made of nitrile rubber;

[0018] A support layer disposed within the flexible layer. The support layer is made of steel.

[0019] In a feasible embodiment, the support assembly includes:

[0020] A tube body portion formed with a hydraulic channel, and the central tube is disposed within the tube body portion;

[0021] A liquid supply portion communicating with the input end of the hydraulic channel for delivering a liquid medium into the hydraulic channel;

[0022] A limiting ring sleeved on the tube body portion and located at the output end of the hydraulic channel. The outer diameter of the limiting ring is greater than the inner diameter of the patch tube and is used to abut against one end of the patch tube;

[0023] A check valve disposed on the tube body portion. The check valve communicates with the hydraulic channel and is used to conduct in the direction from the output end to the input end of the hydraulic channel.

[0024] In a feasible embodiment, the support assembly further includes:

[0025] A head portion detachably disposed at one end of the check valve away from the tube body portion. The diameter of the head portion is greater than the outer diameter of the limiting ring;

[0026] Among them, the head portion is made of a material soluble in well fluid.

[0027] In a feasible embodiment, the support assembly is provided with at least two expansion assemblies. The at least two expansion assemblies are arranged at intervals along the extending direction of the support assembly. Among them, at least one expansion assembly is arranged corresponding to one end of the patch tube, and at least one expansion assembly is arranged corresponding to the other end of the patch tube. The tube body portion is formed with an overflow hole communicating with the hydraulic channel, and the overflow hole is located between two adjacent expansion assemblies.

[0028] In a feasible implementation manner, the casing patch device further includes:

[0029] A cleaning component, including a brushing part and a hydraulic transmission part. The brushing part is connected to the hydraulic transmission part, and the input end of the hydraulic transmission part is communicated with the output end of the liquid supply part. The liquid supply part is used to drive the brushing part to rotate through the hydraulic transmission part.

[0030] In a feasible implementation manner, the patch pipe includes:

[0031] A pipe body, movably sleeved on the support component. Self-locking thread structures are formed at both ends of the pipe body, and the self-locking thread structures are located outside the pipe body;

[0032] A plurality of first sealing rings, sleeved on the pipe body;

[0033] A plurality of second sealing rings, sleeved on the pipe body. Along the extending direction of the pipe body, the first sealing rings and the second sealing rings are arranged alternately;

[0034] Wherein, the first sealing ring is made of rubber material, and the second sealing ring is made of stainless steel material.

[0035] In a feasible implementation manner, the wall thickness of the pipe body is greater than or equal to 3 mm and less than or equal to 6 mm; and / or

[0036] The elongation rate of the pipe body is greater than or equal to 20% and less than or equal to 30%; and / or

[0037] The pipe body is made of stainless steel material.

[0038] Compared with the prior art, the present disclosure at least includes the following beneficial effects: The casing patch device provided by the embodiments of the present disclosure includes a support assembly, a patch tube, and an expansion assembly. Among them, the patch tube is movably sleeved on the support assembly, and the expansion assembly is arranged on the support assembly and located between the inner wall of the patch tube and the support assembly. The expansion assembly has an expanded state and a contracted state. In the case where the expansion assembly is in the expanded state, the expansion assembly abuts against the inner wall of the patch tube and can apply pressure to the patch tube to increase the inner diameter of the patch tube. In the case where the expansion assembly is in the contracted state, the expansion assembly is separated from the inner wall of the patch tube, and there is a gap between both the expansion assembly and the support assembly and the inner wall of the patch tube, so that the patch tube and the support assembly can move relative to each other. Thus, based on the foregoing settings, the casing patch device provided by the present disclosure can utilize the expansion deformation ability of the expansion assembly to expand the inner diameter of the patch tube, so that the patch tube is attached to the inner wall of the casing to be repaired. Moreover, the size of the expansion assembly can be flexibly changed, which is convenient for expanding the inner diameter of the patch tube to different degrees in practical applications. Furthermore, the adaptability of the casing patch device to casing deformation wells can be improved, which is beneficial to making the patch tube more firmly attached to the casing to be repaired, reducing the inner diameter loss of the casing to be repaired after repair, ensuring the pressure-bearing performance of the casing to be repaired after repair, and providing a reliable guarantee for improving the utilization rate of old wells after repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] By reading the detailed description of the exemplary embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the exemplary embodiments and are not considered to be a limitation of the present disclosure. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0040] Figure 1 is a schematic structural diagram of a casing patch device according to an embodiment provided by the present disclosure;

[0041] Figure 2 is a schematic application scenario diagram of a casing patch device according to an embodiment provided by the present disclosure;

[0042] Figure 3 is a schematic structural diagram of another casing patch device according to an embodiment provided by the present disclosure;

[0043] Figure 4 is a schematic application scenario diagram of another casing patch device according to an embodiment provided by the present disclosure;

[0044] Figure 5 is a schematic structural diagram of a patch tube according to an embodiment provided by the present disclosure;

[0045] Figure 6 is a schematic structural diagram of a cleaning assembly according to an embodiment provided by the present disclosure.

[0046] Among them, Figures 1 to 6 The corresponding relationship between the reference numerals and the component names in the drawings is as follows:

[0047] 10' casing to be repaired; 20' tubing;

[0048] 100 support assembly; 200 patch tube; 300 expansion assembly; 400 cleaning assembly;

[0049] 110 pipe body part; 120 liquid supply part; 130 limit ring; 140 check valve; 150 end head part; 160 centralizer;

[0050] 210 pipe body; 220 first sealing ring; 230 second sealing ring;

[0051] 310 central pipe; 320 expansion part;

[0052] 410 brushing part; 420 hydraulic drive part;

[0053] 411 sleeve; 412 fixator; 413 wire brush; 414 baffle; 415 fixing pin; 416 first rotation hole; 417 second rotation hole;

[0054] 421 liquid inlet pipe; 422 fixing pressure ring; 423 first bearing; 424 liquid outlet hole; 425 second bearing;

[0055] 1101 overflow hole;

[0056] 2101 self-locking thread structure. Detailed implementation manners

[0057] Hereinafter, exemplary embodiments of the present disclosure will be described in more detail with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art.

[0058] As Figures 1 to 6As shown in the figure, according to an embodiment of the present disclosure, a casing patch device is provided, including: a support assembly 100; a patch tube 200 movably sleeved on the support assembly 100; an expansion assembly 300 disposed on the support assembly 100 and located between the inner wall of the patch tube 200 and the support assembly 100, the expansion assembly 300 having an expanded state and a contracted state; wherein, when the expansion assembly 300 is in the expanded state, the expansion assembly 300 abuts against the inner wall of the patch tube 200 to increase the inner diameter of the patch tube 200; when the expansion assembly 300 is in the contracted state, the expansion assembly 300 is separated from the inner wall of the patch tube 200 to enable relative movement between the patch tube 200 and the support assembly 100.

[0059] The casing patch device provided by the embodiment of the present disclosure includes a support assembly 100, a patch tube 200, and an expansion assembly 300. Among them, the patch tube 200 is movably sleeved on the support assembly 100, and the expansion assembly 300 is disposed on the support assembly 100 and located between the inner wall of the patch tube 200 and the support assembly 100. The expansion assembly 300 has an expanded state and a contracted state. When the expansion assembly 300 is in the expanded state, the expansion assembly 300 abuts against the inner wall of the patch tube 200 and can apply pressure to the patch tube 200 to increase the inner diameter of the patch tube 200. When the expansion assembly 300 is in the contracted state, the expansion assembly 300 is separated from the inner wall of the patch tube 200, and there are gaps between both the expansion assembly 300 and the support assembly 100 and the inner wall of the patch tube 200 to enable relative movement between the patch tube 200 and the support assembly 100. Thus, based on the foregoing settings, the casing patch device provided by the present disclosure can utilize the expansion deformation ability of the expansion assembly 300 to expand the inner diameter of the patch tube 200 so that the patch tube 200 is attached to the inner wall of the casing 10' to be repaired. Moreover, the size of the expansion assembly 300 can be flexibly changed, which is convenient for expanding the inner diameter of the patch tube 200 to different degrees in actual applications. Furthermore, it can improve the adaptability of the casing patch device to casing deformation wells, which is beneficial for making the patch tube 200 more firmly attached to the casing 10' to be repaired, reducing the inner diameter loss of the casing 10' to be repaired after repair, ensuring the pressure-bearing performance of the casing 10' to be repaired after repair, and providing a reliable guarantee for improving the utilization rate of old wells after repair.

[0060] It can be understood that the foregoing subsidy pipe 200 is movably sleeved on the support assembly 100, which may mean that the subsidy pipe 200 is in clearance fit with the support assembly 100, that is, the inner diameter of the subsidy pipe 200 is greater than the inner diameter of the support assembly 100, and at the same time, the inner diameter of the subsidy pipe 200 is greater than the outer diameter of the expansion assembly 300 in the contracted state. Thus, when the expansion assembly 300 is in the contracted state, the subsidy pipe 200 can axially move relative to the expansion assembly 300 and the support assembly 100. Based on the foregoing settings, in practical applications, the axial dimension of the expansion assembly 300 can be set to be smaller than the axial dimension of the subsidy pipe 200, so as to reduce the overall volume of the expansion assembly 300, lower the manufacturing cost of the expansion assembly 300, and be beneficial to improving the state control flexibility and reliability of the expansion assembly 300. Correspondingly, during the subsidy operation, the support assembly 100 together with the expansion assembly 300 and the subsidy pipe 200 disposed thereon can be lowered into the section to be subsidized of the casing 10' to be repaired, and the upper end of the subsidy pipe 200 can be expanded by the expansion assembly 300 until the outer wall of the subsidy pipe 200 fits against the inner wall of the foregoing section to be subsidized, so that the upper end of the subsidy pipe 200 is attached to the upper section of the foregoing section to be subsidized. To ensure the reliability of the subsidy, after the upper end of the subsidy pipe 200 is attached to the inner wall of the casing 10' to be repaired, the expansion assembly 300 can be kept in the expanded state for more than 20 minutes, which is beneficial to maintaining the plastic deformation of the subsidy pipe 200 and avoiding the deformation recovery phenomenon of the subsidy pipe 200 after being separated from the expansion assembly 300 to reduce the risk of subsidy failure. After the subsidy of the upper end of the subsidy pipe 200 is completed, the subsidy pipe 200 can be fixed to the inner wall of the casing 10' to be repaired. Thus, the expansion assembly 300 can be adjusted to the contracted state to facilitate the movement of the expansion assembly 300 and the support assembly 100 relative to the subsidy pipe 200. Furthermore, by further lowering the support assembly 100, the expansion assembly 300 can be moved to the unexpanded pipe section of the subsidy pipe 200, which is convenient for the expansion assembly 300 to expand the inner diameter section by section along the axis of the subsidy pipe 200. It can be understood that after the expansion assembly 300 completes the expansion subsidy operation of one pipe section, the distance of the axial length of one expansion assembly 300 can be lowered, and then the sectional subsidy of the subsidy pipe 200 can be realized. After the expansion of each pipe section of the subsidy pipe 200 is completed, the support assembly 100 together with the expansion assembly 300 can be taken out of the casing 10' to be repaired.

[0061] It can be understood that the foregoing support assembly 100 can be in a columnar structure, which is convenient for clearance fit with the subsidy pipe 200 and being lowered into the casing 10' to be repaired during the construction process. At the same time, it can also improve the structural stability and reliability of the support assembly 100, facilitate the support assembly 100 to provide stable support for the expansion assembly 300, and further ensure the operation reliability of the expansion assembly 300.

[0062] It can be understood that the foregoing expansion assembly 300 being located between the support assembly 100 and the inner wall of the subsidy pipe 200 means that the expansion assembly 300 is located between the outer peripheral wall of the support assembly 100 and the inner peripheral wall of the subsidy pipe 200. By switching the state of the expansion assembly 300, the surface profile size or volume of the expansion assembly 300 can be changed, so that the expansion assembly 300 can abut against or separate from the inner wall of the subsidy pipe 200, in order to apply the pressure required for inner diameter expansion to the subsidy pipe 200 or release the constraint on the subsidy pipe 200. The expansion and contraction deformation of the expansion assembly 300 can be achieved based on the movement of the mechanical structure or through fluid pressurization deformation. The specific expansion and contraction deformation method can be set according to the actual needs, as long as it can make the expansion assembly 300 abut against the inner wall of the subsidy pipe 200 in the expanded state to increase the inner diameter of the subsidy pipe 200, and separate from the inner wall of the subsidy pipe 200 in the contracted state so that the subsidy pipe 200 and the support assembly 100 can move relative to each other.

[0063] It should be noted that in traditional technologies, methods such as cement squeezing and casing patch are often used for casing repair. However, due to factors such as the absorption capacity of the formation in cement squeezing, phenomena such as the inability of cement slurry to be squeezed into the formation or squeezing and sealing of channels are likely to occur, resulting in poor pressure-bearing capacity after casing repair, and an increased probability of quality problems and engineering accidents during the construction process. Although casing patch can avoid the aforementioned problems of cement squeezing, traditional casing patch methods usually use an expansion cone with a fixed structural size to expand the inner diameter of the patch pipe from bottom to top. Limited by the fixed size of the expansion cone, it is difficult for the size of the patch pipe after expansion to match the casing to be repaired, often resulting in serious loss of the inner diameter of the casing and low pressure-bearing performance after patching, affecting the development and utilization of old wells after repair, and having poor applicability to casing deformation wells. At the same time, the moving resistance of the expansion cone during the expansion process is large, and sticking of the drill is likely to occur. Compared with the casing patch method in traditional technologies, the casing patch device provided in this embodiment of the present invention is based on the foregoing settings. On the one hand, it can use the expansion and deformation ability of the expansion assembly 300 to expand the inner diameter of the patch pipe 200, so that the patch pipe 200 is attached to the inner wall of the casing 10' to be repaired, and the size of the expansion assembly 300 can be flexibly changed, facilitating the expansion of the inner diameter of the patch pipe 200 to different degrees in actual applications. Furthermore, the adaptability of the casing patch device to casing deformation wells can be improved, which is beneficial to making the patch pipe 200 more firmly attached to the casing 10' to be repaired, reducing the loss of the inner diameter of the casing 10' after repair, ensuring the pressure-bearing performance of the casing 10' after repair, and providing a reliable guarantee for improving the utilization rate of old wells after repair. On the other hand, when the expansion assembly 300 is in a contracted state, both the expansion assembly 300 and the support assembly 100 can be separated from the patch pipe 200, facilitating the adjustment of the position of the expansion assembly 300 during the construction process, reducing the moving resistance of the expansion assembly 300, facilitating the segmented expansion of the patch pipe 200, and being beneficial to reducing the probability of sticking of the drill during the casing patch operation.

[0064] As Figures 1 to 4 shown, in some examples, the expansion assembly 300 includes: a central pipe 310 disposed in the support assembly 100, the support assembly 100 being formed with a hydraulic channel, and the interior of the central pipe 310 being in communication with the hydraulic channel; an expansion member 320 disposed on the central pipe 310, the expansion member 320 being located between the outer wall of the central pipe 310 and the patch pipe 200, a liquid injection cavity being formed between the expansion member 320 and the central pipe 310, and the liquid injection cavity being in communication with the interior of the central pipe 310; wherein, the expansion member 320 is made of a flexible material.

[0065] In this technical solution, the expansion assembly 300 may include a central tube 310 and an expansion member 320. Among them, the central tube 310 is disposed on the support assembly 100 and is connected to the hydraulic channel of the support assembly 100. In practical applications, the aforementioned hydraulic channel is used to access a liquid medium so that the liquid pressure in the hydraulic channel is adjustable. Correspondingly, the liquid pressure in the central tube 310 can also change following the liquid pressure in the hydraulic channel. The expansion member 320 is disposed on the central tube 310 and forms a liquid injection cavity between the expansion member 320 and the central tube 310. The liquid injection cavity is connected to the inside of the central tube 310. Thus, the liquid injection cavity can also receive the liquid medium, and the liquid pressure inside the liquid injection cavity can also change following the liquid pressure in the hydraulic channel. At the same time, the expansion member 320 is made of a flexible material. Thus, on the one hand, the expansion member 320 can generate shrinkage and expansion deformation when the liquid pressure in the liquid injection cavity changes, thereby realizing the state switching of the expansion assembly 300. That is, in practical applications, the expansion member 320 can be expanded under pressure by increasing the liquid pressure inside the liquid channel, and the expansion member 320 can be restored to its deformed state to contract by reducing the liquid pressure inside the liquid channel, thereby facilitating the expansion of the inner wall of the liner pipe 200 by applying pressure or releasing the constraint on the expansion pipe. On the other hand, the surface of the expansion member 320 can be made to have high flexibility. Thus, when the expansion member 320 contacts the inner wall of the liner pipe 200, the risk of structural damage to the liner pipe 200 can be reduced, realizing the flexible expansion of the inner diameter of the liner pipe 200, further ensuring the structural reliability of the liner pipe 200, and enhancing the liner subsidy effect and the load-bearing performance after the subsidy.

[0066] It can be understood that during the casing subsidy construction process, when the support assembly 100 together with the expansion assembly 300 and the liner pipe 200 disposed thereon are lowered into the section to be subsidized of the casing 10' to be repaired, the hydraulic channel can be accessed with a liquid medium and the liquid pressure inside the hydraulic channel can be increased so that the expansion assembly 300 enters the expanded state, thereby expanding the inner diameter of the liner pipe 200. After the expansion subsidy of the current pipe section of the liner pipe 200 is completed, the liquid pressure in the hydraulic channel can be reduced so that the expansion assembly 300 is in the contracted state, facilitating the movement of the expansion assembly 300 and the support assembly 100.

[0067] It can be understood that the aforementioned liquid medium can be well fluid, power fluid, or other liquids suitable for mixing with well fluid.

[0068] In some examples, the Shore hardness of the expansion member 320 is greater than or equal to 80 HA and less than or equal to 90 HA; and / or the tensile strength of the expansion member 320 is greater than or equal to 240 kg / cm 2 ; and / or the elongation rate of the expansion member 320 is greater than or equal to 200%.

[0069] In this technical solution, the Shore hardness of the expansion member 320 can be set to be greater than or equal to 80 HA and less than or equal to 90 HA. Based on the foregoing setting, the expansion member 320 can have good flexibility, which is beneficial for the expansion member 320 to generate shrinkage and expansion deformation under the action of liquid pressure, and reduces the probability of the expansion member 320 damaging the inner wall of the subsidy pipe 200.

[0070] In this technical solution, the tensile strength of the expansion member 320 can be set to be greater than or equal to 240 kg / cm 2 , so that based on the foregoing setting, the expansion member 320 can have good structural strength, which is beneficial to extend the service life of the expansion member 320, reduce the maintenance cost of the casing subsidy device, and is beneficial to reduce the operation cost of casing subsidy.

[0071] In this technical solution, the elongation rate of the expansion member 320 can be greater than or equal to 200%. Based on the foregoing setting, the expansion member 320 can have strong expansion and contraction performance, which is beneficial to further improve the dimensional change flexibility of the expansion assembly 300, enhance the adaptability of the casing subsidy tool to the casing deformation pipe, and further enhance the casing subsidy effect.

[0072] It can be understood that the foregoing three parameter ranges of the expansion member 320 can be adopted simultaneously, or any one or any two of them can be adopted only, and no more limitations are made here. The foregoing three parameter ranges can be realized based on the material selection and forming process of the expansion member 320, and the specific implementation method is not limited here.

[0073] In some feasible examples, the tensile strength of the expansion member 320 can be set to 250 kg / cm 2 .

[0074] In some feasible examples, the elongation rate of the expansion member 320 can be set to 250%.

[0075] In some examples, the expansion member 320 includes: a flexible layer disposed on the central tube 310, an injection cavity formed between the flexible layer and the central tube 310, the flexible layer is made of nitrile rubber; a support layer disposed within the flexible layer, the support layer is made of steel.

[0076] In this technical solution, the expansion member 320 may include a flexible layer and a support layer. Among them, the flexible layer is made of nitrile rubber and is disposed on the central tube 310, and the support layer is made of steel and is disposed within the flexible layer. Thus, based on the foregoing arrangement, on the one hand, while ensuring the structural strength of the expansion member 320, the expansion member 320 can have strong temperature and pressure resistance performance to extend the service life of the expansion member 320; on the other hand, it can also make the expansion member 320 have good flexibility and strong elasticity, so as to facilitate the expansion and contraction deformation of the expansion member 320, and have strong deformation recovery ability, which is conducive to the repeated use of the expansion assembly 300, and can reduce the probability of the expansion member 320 damaging the inner wall of the liner 200 during the operation process.

[0077] It can be understood that the support layer can be regarded as the skeleton structure of the expansion member 320 and is wrapped by the flexible layer. In practical applications, the foregoing expansion member 320 can be obtained by vulcanizing nitrile rubber on the foregoing support layer.

[0078] As Figures 1 to 4 shown, in some examples, the support assembly 100 includes: a tube body portion 110, which forms a hydraulic channel, and the central tube 310 is disposed on the tube body portion 110; a liquid supply portion 120, which is communicated with the input end of the hydraulic channel and is used to convey a liquid medium into the hydraulic channel; a limit ring 130, which is sleeved on the tube body portion 110 and is located at the output end of the hydraulic channel, and the outer diameter of the limit ring 130 is greater than the inner diameter of the liner 200 and is used to abut against one end of the liner 200; a check valve 140, which is disposed on the tube body portion 110, the check valve 140 is communicated with the hydraulic channel, and the check valve 140 is used to conduct in the direction from the output end to the input end of the hydraulic channel.

[0079] In this technical solution, the support assembly 100 may include a tube body portion 110, a liquid supply portion 120, a limit ring 130 and a check valve 140. Among them, the foregoing central tube 310 is disposed on the tube body portion 110, the liquid supply portion 120 is communicated with the hydraulic channel of the tube body portion 110 and is used to convey a liquid into the hydraulic channel, so as to facilitate adjusting the liquid pressure in the hydraulic channel and prompting the expansion and contraction deformation of the expansion member 320; the limit ring 130 is sleeved on the tube body portion 110 and is located at the output end of the hydraulic channel and is used to abut against one end of the liner 200. Thus, during the process of lowering the casing patch device into the casing 10' to be repaired, the axial movement of the liner 200 can be restricted by the limit ring 130 to improve the stability of the liner 200 during the lowering process; the check valve 140 is disposed on the tube body portion 110 and is communicated with the hydraulic channel, and the check valve 140 conducts in the direction from the output end to the input end of the hydraulic channel. Thus, during the process of the liquid supply portion 120 injecting a liquid medium into the hydraulic channel, the liquid medium can be prevented from flowing out through the output end of the hydraulic channel, and further it is convenient for the liquid supply portion 120 to pressurize to adjust the liquid pressure in the hydraulic channel and realize the state adjustment of the expansion assembly 300.

[0080] It can be understood that the hydraulic channel can be opened along the axial direction of the pipe body portion 110. Correspondingly, an input end and an output end of the hydraulic channel are respectively formed at both circumferential ends of the pipe body portion 110. In practical applications, one end of the pipe body portion 110 where the input end of the hydraulic channel is formed can be directly or indirectly connected to the output end of the liquid supply portion 120. For example, the aforementioned indirect connection can be connecting a tubing 20' between the output end of the liquid supply portion 120 and the pipe body portion 110, so as to facilitate the liquid supply portion 120 injecting oil and pressurizing into the hydraulic channel through the tubing 20'. Correspondingly, the support assembly 100 can include an adapter connected between the tubing 20' and the pipe body portion 110.

[0081] It can be understood that the connection relationship between the pipe body portion 110 and the liquid supply portion 120 can be a detachable connection. In practical applications, if it is necessary for the expansion member 320 to quickly switch from the expanded state to the contracted state, the pipe body portion 110 can be removed from the output end of the liquid supply portion 120 to relieve the pressure in the hydraulic pipeline. At the same time, the output end of the liquid supply portion 120 can be communicated with the annulus between the support assembly 100 and the casing to be repaired 10', so as to facilitate the energy supply portion pressurizing into the aforementioned annulus, thereby making the pressure of the liquid outside the expansion member 320 and the hydraulic pipeline higher than the pressure of the liquid inside, which is beneficial to the quick contraction of the expansion member 320. Moreover, when the liquid supply portion 120 pressurizes into the aforementioned annulus, the liquid pressure in the annulus can also act on the hydraulic channel through the check valve, which is further beneficial to reducing the internal pressure of the hydraulic channel and increasing the contraction speed of the expansion member 320, facilitating the quick recovery of the expansion assembly 300 and the support assembly 100 after construction, and reducing the risk of the device getting stuck and damaged due to the incomplete contraction of the expansion assembly 300 during the recovery process.

[0082] In some feasible examples, the casing patch device can further include a valve body switch for controlling the opening and closing state of the aforementioned check valve 140. In practical applications, when it is necessary to recover the support assembly 100 and the expansion assembly 300 from the well, the aforementioned valve body switch can be used to open the check valve 140, so as to facilitate the liquid medium in the hydraulic channel flowing into the well through the check valve 140 during the process of lifting the support assembly 100, avoiding the liquid medium spilling everywhere after the support assembly 100 exits the well, being beneficial to maintaining the well site hygiene, and reducing the amount of kill fluid injected into the wellbore. It can be understood that the aforementioned valve body switch can be an electric control switch or a mechanical switch, and no more limitations are made here.

[0083] In some feasible examples, the number of check valves 140 can be greater than or equal to two, and each check valve 140 is connected in series in turn, so as to further reduce the risk of pressure relief in the hydraulic channel when the liquid supply portion 120 pressurizes into the hydraulic channel, providing guarantee for the smooth expansion of the expansion member 320.

[0084] In some feasible examples, the outer diameter of the limit ring 130 can be greater than the inner diameter of the patch tube 200 and less than the outer diameter of the patch tube 200, so as to avoid the radial dimension of the limit ring 130 being too large, which is beneficial to improving the structural passability of the casing patch device. It can be understood that the inner diameter and outer diameter of the aforementioned patch tube 200 are the inner diameter and outer diameter of the patch tube 200 before expansion.

[0085] In some feasible examples, the support assembly 100 may further include a centralizer 160. The centralizer 160 is arranged on the pipe body portion 110 and there is a gap formed between the centralizer 160 and the patch tube 200. Thus, when the patch tube 200 undergoes radial movement, the centralizer 160 can be used to support the patch tube 200 to prevent the patch tube 200 from being greatly skewed. It can be understood that the number of centralizers 160 can be greater than or equal to two, and each centralizer 160 can be arranged at intervals along the axial direction of the pipe body portion 110.

[0086] As Figures 1 to 4 shown, in some examples, the support assembly 100 further includes: an end head 150, which is detachably arranged at one end of the check valve 140 away from the pipe body portion 110, and the diameter of the end head 150 is greater than the outer diameter of the limit ring 130; wherein, the end head 150 is made of a material soluble in well fluid.

[0087] In this technical solution, the support assembly 100 may further include an end head 150 arranged at one end of the check valve 140 away from the pipe body portion 110, and the diameter of the end head 150 can be set to be greater than the outer diameter of the limit ring 130, that is, the end head 150 can be the component with the largest radial dimension in the support assembly 100. Thus, during the process of recovering the support assembly 100 after the patch tube 200 is expanded and patched, the end head 150 can be used to verify the expansion and patching effect. That is, if the end head 150 can be smoothly lifted out of the well through the casing section where the patch tube 200 is located, it indicates that the expansion and patching effect is good; if the end head 150 gets stuck on the patch tube 200, it indicates that at least part of the inner diameter of the patch tube 200 has not been fully expanded. At the same time, the connection between the end head 150 and the check valve 140 can be set to be detachable, so as to facilitate selecting an end head 150 with a suitable specification according to the structure of the casing 10' to be repaired. And the end head 150 is made of a material soluble in well fluid. Thus, in the case where at least part of the inner diameter of the patch tube 200 has not been fully expanded, the end head 150 can be disassembled and left in the well, so as to facilitate the support assembly 100 to be taken out and lowered into the well again for expansion and patching, and can prevent the end head 150 from staying in the well for a long time, which is beneficial to reducing downhole debris and providing convenience for the development and utilization after the repair of the casing damage well.

[0088] In some feasible examples, the end head 150 can be made of magnesium aluminum alloy to facilitate the dissolution of the end head 150 underground. It can be understood that the end head 150 made of magnesium aluminum alloy can dissolve in the well fluid within 5 days at a wellbore temperature of 40°C, and the dissolution time will shorten as the wellbore temperature increases.

[0089] In some feasible examples, the diameter of the end head 150 can be set 3 to 4 mm larger than the outer diameter of the patch tube 200, so as to ensure the verification effect of the end head 150 on the patching effect. It can be understood that the outer diameter of the aforementioned patch tube 200 is the outer diameter of the patch tube 200 before expansion. At the same time, the diameter of the end head 150 can also be set 3 to 4 mm smaller than the diameter of the patch tube 200 after expansion, so as to ensure that the end head 150 has relatively good structural passability and avoid the end head 150 getting stuck on the inner wall of the patch tube 200 when the expansion patching effect is good. It can be understood that the diameter of the patch tube 200 after expansion can be determined based on the wall thickness of the patch tube 200 and the structural dimensions of the section to be repaired of the casing 10' to be repaired in actual applications.

[0090] In some feasible examples, the support assembly 100 can also include a first pin. The end head 150 is connected to the check valve through the first pin. The maximum shear force that the first pin can withstand is less than 3 tons. Thus, in actual applications, the first pin can be cut by applying an upward force of 3 to 6 tons to the support assembly 100, so that the end head 150 remains in the well.

[0091] In some feasible examples, the support assembly 100 can also include a second pin. The aforementioned limit ring 130 is connected to the tube body part 110 through the second pin. The maximum shear force that the second pin can withstand is greater than 6 tons and less than 15 tons. Thus, in actual applications, if the limit ring 130 gets stuck underground, the second pin can also be cut by applying an upward force of 15 to 18 tons to the support assembly 100, so that the limit ring 130 is separated from the tube body part 110 and remains in the well, facilitating the removal of the tube body part 110 and the expansion assembly 300.

[0092] It should be noted that the maximum shear forces that the aforementioned first pin and second pin can withstand can also be determined in combination with the hanging anchoring force of the patch tube 200, and there is no excessive limitation here.

[0093] Such as Figure 3 and Figure 4As shown, in some examples, the support assembly 100 is provided with at least two expansion assemblies 300. The multiple expansion assemblies 300 are arranged at intervals along the extension direction of the support assembly 100. Among them, at least one expansion assembly 300 is arranged corresponding to one end of the patch tube 200, and at least one expansion assembly 300 is arranged corresponding to the other end of the patch tube 200. An overflow hole 1101 communicating with the hydraulic channel is formed in the tube body portion 110, and the overflow hole 1101 is located between two adjacent expansion assemblies 300.

[0094] In this technical solution, the support assembly 100 can be provided with multiple expansion assemblies 300. Among them, at least one expansion assembly 300 is arranged corresponding to one end of the patch tube 200, and at least one expansion assembly 300 is arranged corresponding to the other end of the patch tube 200. Thus, based on the foregoing arrangement, during the casing patching operation, the two ends of the patch tube 200 can be simultaneously expanded and inflated, so that the two ends of the patch tube 200 are simultaneously attached to the casing 10' to be repaired, which is beneficial to improving the end patching efficiency of the patch tube 200. And in practical applications, after the two ends of the patch tube 200 are inflated and patched, the expanded state of the expansion assembly 300 can be maintained to seal the annulus between the patch tube 200 and the support assembly 100, and the liquid pressure inside the hydraulic channel can be further increased, so that the liquid medium overflows into the annulus between the patch tube 200 and the support assembly 100 through the overflow hole 1101, thereby increasing the liquid pressure in the foregoing annulus, and further facilitating the use of the hydraulic expansion method to realize the inner diameter expansion of the middle pipe section of the patch tube 200, so that the middle pipe section of the patch tube 200 is patched to the casing 10' to be repaired, and it is convenient to control the inner diameter expansion amount of the middle pipe section of the patch tube 200 by adjusting the liquid pressure. Furthermore, it is beneficial to further ensure the adaptability of the casing patching device to the deformed casing, and can further improve the operation execution efficiency of the casing patching, and enhance the adaptability of the casing patching device to the long-distance patching and repair working conditions.

[0095] It can be understood that when the length of the section to be patched of the casing 10' to be repaired is small, for example, when the length of the section to be patched is less than or equal to 4m, a casing patching device with a single expansion assembly 300 can be used to perform patching and repair in the foregoing step-by-step expansion manner; when the length of the section to be patched of the casing 10' to be repaired is large, for example, when the length of the section to be patched is greater than 4m, a casing patching device with at least two expansion assemblies 300 can be used to perform patching and repair in the foregoing end abutting expansion and middle hydraulic expansion manner to improve the operation execution efficiency of the casing patching.

[0096] It can be understood that the foregoing overflow hole 1101 can overflow when the pressure difference inside and outside the hydraulic channel is higher than the overflow pressure. The foregoing overflow pressure can be determined based on the pressure-bearing performance of the expansion assembly 300 and the pressure required for the end expansion of the patch tube 200, and no excessive limitation is made here.

[0097] As Figure 6 shown, in some examples, the casing patch device further includes a cleaning assembly 400, which includes a brushing part 410 and a hydraulic transmission part 420. The brushing part 410 is connected to the hydraulic transmission part 420, and the input end of the hydraulic transmission part 420 communicates with the output end of the liquid supply part 120. The liquid supply part 120 is used to drive the brushing part 410 to rotate through the hydraulic transmission part 420.

[0098] In this technical solution, the casing patch device may further include a cleaning assembly 400. Based on the foregoing settings of the cleaning assembly 400, in practical applications, the casing patch device can use the cleaning assembly 400 to brush the inner wall of the casing 10' to be repaired before the patch operation, so as to reduce the dirt on the inner wall of the casing to be patched, which is beneficial to further ensuring the casing patch effect, enhancing the bearing performance after patching, and the liquid supply part 120 can be used as the power source of the cleaning assembly 400, without separately configuring a power device for the cleaning assembly 400, which is beneficial to improving the integration of the casing patch device and reducing the manufacturing cost of the casing patch device.

[0099] Exemplarily, the aforementioned brushing part 410 may include a sleeve 411, a retainer 412, a wire brush 413, a baffle 414, a fixing pin 415, a first rotating hole 416, and a second rotating hole 417; the aforementioned hydraulic transmission part 420 may include a liquid inlet pipe 421, a fixing pressure ring 422, a first bearing 423, a liquid outlet hole 424, a second rotating hole 417, and a second bearing 425. Among them, the retainer 412 is arranged on the sleeve 411, the wire brush 413 is arranged on the retainer 412, the baffle 414 is arranged on the sleeve 411 through the fixing pin 415, and the baffle 414 is sleeved on the wire brush 413. The first rotating hole 416 and the second rotating hole 417 are respectively opened near both ends of the sleeve 411, and the axes of the first rotating hole 416 and the second rotating hole 417 are both spiral around the axis of the sleeve 411; the liquid inlet pipe 421 is detachably connected to the output end of the liquid supply part 120. The connection between the liquid inlet pipe 421 and the output end of the liquid supply part 120 may be a direct connection or an indirect connection. The liquid inlet pipe 421 is provided with a liquid outlet hole 424. The sleeve 411 is sleeved on the liquid inlet pipe 421 and has a clearance fit with the liquid inlet pipe 421. Thus, the liquid medium overflowing from the liquid outlet hole 424 can further enter the gap between the sleeve and the liquid inlet pipe 421 and flow into the first rotating hole 416 and the second rotating hole 417. Then, under the pressure of the liquid medium, the sleeve 411 is driven to rotate, and the wire brush 413 is driven to rotate synchronously, so as to facilitate the wire brush 413 to brush the inner wall of the casing 10' to be repaired. The first bearing 423 and the second bearing 425 are respectively arranged at both ends of the sleeve 411. A fixing pressure ring 422 is arranged on the side of the first bearing 423 away from the sleeve 411. The fixing pressure ring 422 is fixedly sleeved on the liquid inlet pipe 421. The second bearing 425 is located between the sleeve 411 and the liquid inlet pipe 421. Thus, based on the arrangement of the first bearing 423 and the second bearing 425, it is beneficial to improve the smoothness of the rotation of the sleeve 411.

[0100] It can be understood that after the cleaning operation is completed, the cleaning assembly 400 can be detached from the output end of the liquid supply part 120, and the pipe body part 110 of the support assembly 100 can be connected to the output end of the liquid supply part 120, so as to perform the casing patch operation after the cleaning operation is completed.

[0101] As Figure 5 shown, in some examples, the patch pipe 200 includes: a pipe body 210, movably sleeved on the support assembly 100. Self-locking thread structures 2101 are formed at both ends of the pipe body 210, and the self-locking thread structures 2101 are located on the outer side of the pipe body 210; a plurality of first sealing rings 220, sleeved on the pipe body 210; a plurality of second sealing rings 230, sleeved on the pipe body 210. Along the extending direction of the pipe body 210, the first sealing rings 220 and the second sealing rings 230 are arranged alternately; among them, the first sealing rings 220 are made of rubber materials, and the second sealing rings 230 are made of stainless steel materials.

[0102] In this technical solution, the subsidy pipe 200 may include a pipe body 210, a first sealing ring 220, and a second sealing ring 230. Among them, self-locking thread structures 2101 are formed at both ends of the pipe body 210. Thus, when both ends of the pipe body 210 are attached to the inner wall of the casing 10' to be repaired, the bonding force between both ends of the pipe body 210 and the casing 10' to be repaired can be increased, further enhancing the load-bearing performance after subsidy; the first sealing ring 220 and the second sealing ring 230 are alternately arranged along the extending direction of the pipe body 210, and the first sealing ring 220 and the second sealing ring 230 are made of rubber material and stainless steel material respectively. Thus, after the entire subsidy pipe 200 is attached to the casing 10' to be repaired, the middle pipe section of the pipe body 210 can connect to the inner wall of the casing 10' to be repaired through the first sealing ring 220 and the second sealing ring 230, and multiple small-sized independent sealing areas can be formed between the middle pipe section of the pipe body 210 and the inner wall of the casing 10' to be repaired, which is beneficial to ensuring the sealing effect after the casing 10' to be repaired, further enhancing the load-bearing performance after repair, and improving the subsidy effect.

[0103] In some feasible examples, the pipe body 210 and the second sealing ring 230 can be set as an integral structure, thereby improving the overall structural strength of the subsidy pipe 200, which is beneficial to further improving the subsidy effect and the load-bearing performance after repair.

[0104] In some examples, the wall thickness of the pipe body 210 is greater than or equal to 3 mm and less than or equal to 6 mm; and / or the elongation rate of the pipe body 210 is greater than or equal to 20% and less than or equal to 30%; and / or the pipe body 210 is made of stainless steel material.

[0105] In this technical solution, the wall thickness of the pipe body 210 can be set to be greater than or equal to 3 mm and less than or equal to 6 mm. It can be understood that the aforementioned wall thickness is the thickness of the pipe body 210 before expansion. Thus, based on the aforementioned setting, the structural strength of the pipe body 210 can be ensured, which is beneficial to further improving the subsidy effect and the load-bearing performance after repair.

[0106] In this technical solution, the elongation rate of the pipe body 210 can be set to be greater than or equal to 20% and less than or equal to 30%, which is beneficial to improving the deformation ability of the pipe body 210, facilitating the deformation of the pipe body 210 during the expansion process, and then ensuring the inner diameter expansion amount, which is beneficial to further reducing the inner diameter loss after repair.

[0107] In this technical solution, the pipe body 210 can be made of stainless steel material, which can further enhance the structural strength of the pipe body 210, beneficial to further improving the subsidy effect and the load-bearing performance after repair.

[0108] It can be understood that the above two parameter ranges and material types of the pipe body 210 can be adopted simultaneously, or any one or two of them can be taken, and there is no excessive limitation here. When the above two parameter ranges and material types are simultaneously adopted for the pipe body 210, the wall thickness of the subsidy pipe 200 after expansion subsidy can be guaranteed to be between 2.5 mm and 5.5 mm, and it can withstand a maximum internal and external pressure difference of 105 MPa and a temperature resistance of 205 °C.

[0109] In the present disclosure, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element. The term "more than two" includes two or more than two cases.

[0110] Obviously, those skilled in the art can make various changes and modifications to this specification without departing from the spirit and scope of this specification. Thus, if these modifications and variations of this specification fall within the scope of the claims of this specification and their equivalent technologies, this specification is also intended to include these modifications and variations.

Claims

1. A casing patch device, characterized in that, it includes: a support assembly; a patch tube movably sleeved on the support assembly; an expansion assembly disposed on the support assembly and between the inner wall of the patch tube and the support assembly, the expansion assembly having an expanded state and a contracted state; wherein, when the expansion assembly is in the expanded state, the expansion assembly abuts against the inner wall of the patch tube to increase the inner diameter of the patch tube; when the expansion assembly is in the contracted state, the expansion assembly is separated from the inner wall of the patch tube to enable relative movement between the patch tube and the support assembly.

2. The casing patch device according to claim 1, characterized in that, the expansion assembly includes: a central tube disposed on the support assembly, the support assembly being formed with a hydraulic channel, the interior of the central tube communicating with the hydraulic channel; an expansion member disposed on the central tube, the expansion member being located between the outer wall of the central tube and the patch tube, a liquid injection cavity being formed between the expansion member and the central tube, the liquid injection cavity communicating with the interior of the central tube; wherein, the expansion member is made of a flexible material.

3. The casing patch device according to claim 2, characterized in that, the shore hardness of the expansion member is greater than or equal to 80 HA and less than or equal to 90 HA; and / or The tensile strength of the expansion member is greater than or equal to 240 kg / cm 2 ; and / or the elongation rate of the expansion member is greater than or equal to 200%.

4. The casing patch device according to claim 2, characterized in that, the expansion member includes: a flexible layer disposed on the central tube, the liquid injection cavity being formed between the flexible layer and the central tube, the flexible layer being made of nitrile rubber; a support layer disposed within the flexible layer, the support layer being made of steel.

5. The casing patch device according to claim 2, characterized in that, the support assembly includes: a tube body portion formed with the hydraulic channel, the central tube being disposed on the tube body portion; a liquid supply portion communicating with the input end of the hydraulic channel for delivering a liquid medium into the hydraulic channel; a limiting ring sleeved on the tube body portion and located at the output end of the hydraulic channel, the outer diameter of the limiting ring being greater than the inner diameter of the patch tube for abutting against one end of the patch tube; a check valve disposed on the tube body portion, the check valve communicating with the hydraulic channel and the check valve being configured to conduct in the direction from the output end to the input end of the hydraulic channel.

6. The casing patch device according to claim 5, characterized in that, the support assembly further includes: a head portion detachably disposed at one end of the check valve away from the tube body portion, the diameter of the head portion being greater than the outer diameter of the limiting ring; wherein, the head portion is made of a material soluble in well fluid.

7. The casing patch device according to claim 5, characterized in that, The support assembly is provided with at least two of the expansion assemblies, and the at least two expansion assemblies are arranged at intervals along the extension direction of the support assembly. Wherein, at least one of the expansion assemblies is arranged corresponding to one end of the subsidy pipe, and at least one of the expansion assemblies is arranged corresponding to the other end of the subsidy pipe. An overflow hole communicating with the hydraulic channel is formed in the pipe body portion, and the overflow hole is located between two adjacent expansion assemblies.

8. The casing subsidy device according to claim 5, characterized in that it further comprises: a cleaning assembly, including a brushing portion and a hydraulic transmission portion, the brushing portion is connected to the hydraulic transmission portion, and the input end of the hydraulic transmission portion is communicated with the output end of the liquid supply portion, and the liquid supply portion is used to drive the brushing portion to rotate through the hydraulic transmission portion.

9. The casing subsidy device according to any one of claims 1 to 8, characterized in that the subsidy pipe includes: a pipe body, movably sleeved on the support assembly, and self-locking thread structures are formed at both ends of the pipe body, and the self-locking thread structures are located outside the pipe body; a plurality of first sealing rings, sleeved on the pipe body; a plurality of second sealing rings, sleeved on the pipe body, and the first sealing rings and the second sealing rings are arranged alternately along the extension direction of the pipe body; wherein, the first sealing ring is made of rubber material, and the second sealing ring is made of stainless steel material.

10. The casing subsidy device according to claim 9, characterized in that the wall thickness of the pipe body is greater than or equal to 3 mm and less than or equal to 6 mm; and / or the elongation rate of the pipe body is greater than or equal to 20% and less than or equal to 30%; and / or the pipe body is made of stainless steel material.

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