Self-adaptive in-pipe service system and implementation method

Abstract

The invention discloses a self-adaptive in-pipe service system which comprises a blasting blocking valve, a checking drift diameter gauge, a flexible expansion tool, an expansion pipe and a limiting assembly, a radial hole and a blasting piece are arranged on the pipe wall corresponding to the blasting blocking valve, and the blasting piece is arranged to conduct blasting when the pressure reaches a first threshold value; the oil pipe is communicated with the inside of the service system through a radial hole; the flexible expansion tool is movably arranged in the expansion pipe, and the flexible expansion tool expands in a pressurized state and resets in a non-pressurized state; the limiting assembly is arranged on the radial outer side of the expansion pipe, and the limiting assembly is arranged to relieve radial limiting of the expansion pipe when the pressure in the system reaches a second threshold value. The invention further provides an implementation method. The technology that patching, diameter passing and pressure testing procedures of the expansion pipe are completed through one pipe column is achieved, the technology is simple, a casing damage well can be repaired, the situation that due to the fact that a casing is irregular, the expansion cone is large in moving resistance is avoided, better well completion flexibility is achieved, and the well completion cost can be greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield well repair operations, and in particular to an adaptive in-pipe service system and an implementation method thereof. Background Art

[0002] The expansion tube patching technology is an important technical means for repairing casing damaged wells. According to incomplete statistics, more than 70 casing damaged wells have been repaired using the expansion tube patching technology since 2009. In production applications, it is found that the inner wall of the wellbore is irregular, uneven, elliptical wellbore diameter, bending and other conditions, and the operation process of the expansion tube does not change with the change of the wellbore shape. There is a solution to the problem that the current expansion tube is constrained by the fixed diameter expansion cone, the expansion tube is shaped according to the expansion cone shape, and cannot adapt well to the wellbore shape, resulting in poor adaptability of the expansion tube plugging and restricted application.

[0003] Patent document with application number 2017100836411 discloses a thin-wall expansion tube device and its operation method. The device directly connects the hydraulic cylinder device with the expansion cone. When the expansion tube is long, the center tube above the hydraulic cylinder device can use the working pipe string, which reduces the manufacturing cost. At the same time, when the hydraulic cylinder device lifts the expansion cone to complete a stroke, the hydraulic cylinder device can be reset by lowering the working pipe string, which is easy to operate. However, its essence is to use a conical expansion cone to cause radial deformation of the thin-wall expansion tube, which may encounter resistance when encountering micro-deformation of the casing.

[0004] Therefore, there is a need in the prior art for improving the in-pipe service system and implementation method of the expansion pipe. Summary of the invention

[0005] In view of this, the purpose of the embodiment of the present invention is to propose an adaptive in-pipe service system and implementation method, which realizes the expansion tube compensation, diameter adjustment, and pressure testing process in one trip to the tubing string. The process is simple, can repair casing damaged wells, avoid large expansion cone movement resistance caused by irregular casing, have greater completion flexibility, and can significantly reduce completion costs.

[0006] Based on the above purpose, an embodiment of the present invention provides an adaptive in-pipeline service system, including:

[0007] In the axial direction of the pipeline, the burst plugging valve, the calibration gauge, the flexible expansion tool, the expansion pipe and the limit assembly are connected in sequence from the upper end to the lower end.

[0008] Among them, the bursting plugging valve divides the pipeline of the service system into a first cavity and a second cavity in the axial direction, and a radial hole and a bursting piece for blocking the radial hole are further arranged on the pipe wall corresponding to the bursting plugging valve, and the bursting piece is arranged to burst when the pressure reaches a first threshold value, so that the oil pipe is connected with the inside of the service system through the radial hole; the flexible expansion tool is movably arranged in the expansion tube, the flexible expansion tool expands and compresses the expansion tube in a pressurized state, and resets in an unpressurized state; the limit assembly is arranged on the radial outside of the expansion tube, and the limit assembly is arranged to release the radial limit on the expansion tube when the pressure in the system reaches a second threshold value.

[0009] In some embodiments, the bursting plugging valve includes a valve core, a valve core pressure cap, and a valve core liquid hole. The hydraulic pump charges pressure into the second cavity through the valve core and the valve core liquid hole, and the valve core pressure cap is detachably connected to the valve core liquid hole.

[0010] In some embodiments, a positioning indicator is further connected to the pipeline above the burst plugging valve.

[0011] In some embodiments, the upper end of the positioning indicator is further connected to a pressure differential valve, and the pressure differential valve is connected to the first cavity and the oil pipe.

[0012] In some embodiments, the limit assembly includes a suspension disconnector and a locking block, wherein the suspension disconnector is arranged radially outside the expansion tube, and the locking block is arranged radially outside the suspension disconnector. When the pressure in the system reaches a second threshold, the suspension disconnector is released, and the locking block radially retracts to release the restriction on the suspension disconnector, thereby further releasing the restriction on the expansion tube.

[0013] In some embodiments, the calibration gauge includes a gauge body, a variable diameter sliding body, and a variable diameter driving device, and the variable diameter sliding body is arranged at the end of the gauge body.

[0014] Another aspect of the present invention further provides an implementation method of the adaptive in-pipe service system, comprising performing the following steps based on the adaptive in-pipe service system:

[0015] Connect the hydraulic pump to the valve core of the blasting blocking valve on the ground, and seal it after pressurization to keep the flexible expansion tool and the expansion tube expanded and sealed;

[0016] The service system is lowered to a predetermined position in the oil pipe, and pressurized to a first pressure threshold to break the bursting disc, so that the pressure in the oil pipe enters the adaptive service system through the radial hole;

[0017] Further pressurizing to reach a second pressure threshold so that the limit assembly is disengaged to release the restriction on the expansion tube in the radial direction;

[0018] Continue to increase the pressure to fully expand the flexible expansion tool so that the expansion tube is attached to the inner wall of the oil pipe. The flexible expansion tool releases pressure and moves to the lower end of the oil pipe. Repeat this step until the expansion tube is fully attached to the oil pipe.

[0019] The system continues to move toward the lower end, so that the calibration gauge passes through the expansion pipe section;

[0020] Close the surface oil pipeline channel and conduct an annular pressure test to test the pressure bearing capacity of the expansion pipe after the expansion pipe is refitted.

[0021] In some embodiments, closing the surface oil pipeline channel and conducting an annular pressure test to determine the pressure bearing capacity of the expanded pipe after the expansion pipe is refitted includes:

[0022] The system continues to move toward the lower end until the ground weight gauge shows that the positioning indicator has entered the expansion tube. The ground oil pipeline channel is closed and the annulus pressure test is carried out to test the pressure bearing capacity of the expansion tube after the expansion tube is refitted.

[0023] In some embodiments, the first pressure threshold is 30-40 MPa.

[0024] In some embodiments, further pressurizing to reach a second pressure threshold so that the limiting assembly disengages and releases the restriction on the expansion tube in the radial direction includes:

[0025] Further pressurizing to 35-42 MPa breaks the shear pins of the suspension release, causing the locking block to retract radially, the suspension release to release, and the radial restriction on the expansion tube to be released.

[0026] The present invention has at least the following beneficial technical effects:

[0027] The system of the present invention realizes the expansion pipe subsidy, diameter, and pressure test process in one trip to complete the pipe string. According to the plastic deformation characteristics of the metal, the expansion technology is used to force the metal to adapt to the well wall, allowing the metal to adapt to the irregular well diameter to achieve complete engagement, large reconstruction diameter, high pressure bearing, no drilling plug, high operating efficiency, forming a new set of new technologies for the reconstruction of old wellbore, more adaptable to the subsidy of casing change wells, achieving the purpose of reducing operating costs and improving the success rate of subsidies. The system and method of the present invention have simple processes, can repair casing damaged wells, avoid large expansion cone movement resistance caused by irregular casing, have greater completion flexibility, and can greatly reduce completion costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A schematic diagram of an embodiment of the adaptive in-pipe service system provided by the present invention;

[0030] Figure 2 It is an enlarged schematic diagram of the first part of the adaptive in-pipe service system provided by the present invention;

[0031] Figure 3 It is an enlarged schematic diagram of the second part of the adaptive in-pipe service system provided by the present invention;

[0032] Figure 4 This is an enlarged schematic diagram of the third part of the adaptive in-pipe service system provided by the present invention.

[0033] Description of reference numerals:

[0034] 1- differential pressure valve, 2- burst plugging valve, 3- valve core, 4- rotating valve core pressure cap, 5- valve core liquid hole, 6- plug, 7- radial hole, 8- bursting disc, 9- calibration gauge, 10- flexible expansion tool, 11- expansion tube, 12- suspension release, 13 locking block, 14- shear nail, 15- connecting oil pipe, 16- positioning indicator. DETAILED DESCRIPTION

[0035] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field of the present invention; the terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. For example, the directions or positions indicated by the terms "length", "width", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positions shown in the drawings, which are only for the convenience of description and should not be understood as limitations on the present technical solution.

[0037] The terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions; the terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects rather than to describe a specific order. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0038] In the specification and claims of the present invention and the above-mentioned drawings, when an element is referred to as being "fixed to" or "mounted on" or "disposed on" or "connected to" another element, it may be directly or indirectly located on the other element. For example, when an element is referred to as being "connected to" another element, it may be directly or indirectly connected to the other element.

[0039] In addition, reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0040] In existing oil well production applications, it is found that the wellbore has irregular inner walls, unevenness, elliptical well diameters, bends and other conditions. The oil well compensation technology in the prior art is constrained by the sizing expansion cone. The expansion tube is shaped according to the shape of the expansion cone. The expansion cone is prone to jamming when encountering irregular positions and cannot adapt well to the wellbore shape, resulting in poor adaptability of the expansion tube plugging and restricted application. Moreover, the procedures for compensation and diametral adjustment of the expansion tube in the prior art are usually not completed in one trip, which is time-consuming and labor-intensive. In view of the above problems in the prior art, the present invention provides an adaptive in-pipe service system and implementation method, such as Figure 1 The figure shows an adaptive in-pipe service system provided by the present invention. Figure 2-4 This is an enlarged schematic diagram of the service system in the adaptive tube, which divides the service system into a first part, a second part and a third part in the axial direction. The display in the figure is only for the convenience of showing the details of the service system structure, and does not limit the division of this system.

[0041] The adaptive in-pipe service system includes a burst plugging valve 2, a calibration gauge 9, a flexible expansion tool 10, an expansion pipe 11 and a limit assembly which are sequentially connected from the upper end to the lower end in the axial direction of the pipeline.

[0042] The burst plugging valve 2 separates the pipeline of the service system into a first cavity and a second cavity in the axial direction. Figure 1As shown in , the left side of the burst plugging valve 2 is the first cavity, and the right side of the burst plugging valve 2 is the second cavity. The pipe wall corresponding to the burst plugging valve 2 is further provided with radial holes 7 and bursting discs 8 for blocking the radial holes 7. The bursting discs 8 are configured to automatically burst when the pressure reaches a first threshold, so that the oil pipe is connected to the inside of the service system through the radial holes 7; the flexible expansion tool 10 is movably arranged in the expansion tube 11, and the flexible expansion tool 10 expands and compresses the expansion tube 11 in a pressurized state, and automatically resets in an unpressurized state; the limit assembly is arranged on the radial outside of the expansion tube, and the limit assembly is configured to automatically release the radial limit of the expansion tube when the pressure in the system reaches a second threshold. In some embodiments of the present invention, the flexible expansion tool 10 can be a longitudinal sac-like structure composed of a polymer composite material, which can deform under internal pressure and provide expansion pressure to the outside.

[0043] Furthermore, a positioning indicator 16 is further connected to the pipeline above the bursting plugging valve 2 .

[0044] Furthermore, the upper end of the positioning indicator 16 is further connected to a differential pressure valve 1 , and the differential pressure valve 1 is in communication with the first cavity and the oil pipe.

[0045] The differential pressure valve 1, the positioning indicator 16, the burst plugging valve 2, the calibration gauge 9, the flexible expansion tool 10, the connecting oil pipe 15, and the suspension release device 12 are fixedly connected from top to bottom by threads.

[0046] Furthermore, if Figure 2 As shown in the enlarged schematic diagram of the first part, the blasting plugging valve 2 includes a valve core 3, a valve core pressure cap 4, and a valve core liquid hole 5. The hydraulic pump charges pressure into the second cavity through the valve core 3 and the valve core liquid hole 5. The valve core pressure cap 4 is detachably connected to the valve core liquid hole 5. In some embodiments, the valve core pressure cap 4 is rotatably connected. When the hydraulic pump charges pressure toward the second cavity through the valve core 3 and the liquid hole 5, the flexible expansion tool 10 is pressurized to expand and seal the expansion tube 11. The sealing can be achieved by rotating and tightening the valve core pressure cap 4 to maintain the expansion state. The pressure can be released by rotating the valve core pressure cap 5 in the opposite direction.

[0047] Furthermore, if Figure 4The third part is shown in the enlarged schematic diagram, the limit assembly includes a suspension disconnector 12 and a locking block 13, the suspension disconnector 12 is arranged on the radial outer side of the expansion tube 11, and the locking block 13 is arranged on the radial outer side of the suspension disconnector 12, when the pressure in the system reaches the second threshold, the shear nail 14 on the suspension disconnector 12 is automatically disconnected, and the locking block 13 is radially retracted to release the restriction on the suspension disconnector 12, thereby further releasing the restriction on the expansion tube 11. In some embodiments, the bursting disc 8 of the burst plugging valve 2 is opened by pressure, so that the pressure in the oil pipe enters the adaptive pipe service system through the radial hole 7, further improving the pressure strength, starting the shear nail 14 of the suspension disconnector 12, and the locking block 13 is radially retracted to release the restriction on the expansion tube 11. The present invention realizes the fixation of the initial position of the expansion tube through the limit assembly, and can also automatically release the restriction on the position of the expansion tube through pressure, which effectively reduces the difficulty of the operation while ensuring the operation effect.

[0048] Furthermore, the calibration gauge 9 includes a gauge body, a variable diameter sliding body and a variable diameter driving device, and the variable diameter sliding body is arranged at the end of the gauge body. The variable diameter function can be realized by pressure. The variable diameter sliding body can quickly adapt and change based on the actual size in the oil well and the well compensation situation, and the present invention integrates the calibration gauge and the expansion tool in a service system, which can realize the diameter inspection of one trip after the compensation, greatly reducing the complexity of the operation.

[0049] In some embodiments, a hydraulic pump is connected to the valve core 3 on the ground through a hydraulic pipeline, and the pressure is increased by 2-3Mpa to expand and seal the flexible expansion tool 10 with the expansion tube 11, and the valve core pressure cap 4 is rotated to block the valve core liquid hole 5, and the expansion tool 10 remains expanded and sealed with the expansion tube 11; the differential pressure valve 1 is further connected to the burst plug valve 2 by threads, and the adaptive in-pipe service system is transported to the predetermined well depth by the oil pipe; in a positive cycle, the bursting disc 8 of the burst plug valve 2 is opened by pressure, so that the pressure in the oil pipe enters the adaptive in-pipe service system through the radial hole 7, and the suspension release device 12 is further pressed to start the shear nail 14, and the lock block 13 is radially retracted to release the restriction on the expansion tube 11; the ground pressure is increased, and the pressure is stabilized for 10 minutes, and the expansion tube 1 is fully expanded. 1 is applied to the casing and the ground pressure is released; the adaptive in-pipe service system moves half of the rubber cylinder of the flexible expansion tool 10 downward until the expansion tube 11 is completely applied to the casing; the adaptive in-pipe service system continues to move downward until the calibration gauge 9 passes through the expansion tube 11 section to check the inner diameter of the expansion tube 11 with a thick patch; the adaptive in-pipe service system continues to move downward, the ground weight indicator shows that the positioning indicator 16 enters the expansion tube 11, the ground oil pipeline channel is closed, and the annulus pressure test is performed to test the pressure bearing capacity of the expansion tube 11 after the patching; the differential pressure valve 1, the positioning indicator 16, the burst plugging valve 2, the calibration gauge 9, the flexible expansion tool 10, the connecting oil pipeline 15, and the suspension disconnector 12 are raised to complete the construction operation.

[0050] Another aspect of the present invention further provides an implementation method of the adaptive in-pipe service system, comprising performing the following steps based on the adaptive in-pipe service system:

[0051] S1 connects the hydraulic pump to the valve core of the blasting blocking valve on the ground, and seals it after pressurization so that the flexible expansion tool and the expansion tube remain expanded and sealed;

[0052] S2 lowers the service system to a predetermined position in the oil pipe, pressurizes it to a first pressure threshold, breaks the bursting disc, and allows the pressure in the oil pipe to enter the adaptive service system through the radial hole;

[0053] S3 further pressurizes to reach a second pressure threshold so that the limit assembly automatically disengages and releases the restriction on the expansion tube in the radial direction;

[0054] S4: continue to increase the pressure to fully expand the flexible expansion tool so that the expansion tube is attached to the inner wall of the oil pipe. The flexible expansion tool releases pressure and moves to the lower end of the oil pipe. This step is repeated until the expansion tube is completely attached to the oil pipe.

[0055] The S5 system continues to move downward to allow the calibration gauge to pass through the expansion pipe section;

[0056] S6 closes the surface oil pipeline channel and performs annular pressure test to test the pressure bearing capacity of the expansion pipe after it is subsidized.

[0057] In some embodiments, the service system further includes a positioning indicator. Therefore, in S6, closing the surface oil pipeline channel and conducting an annular pressure test to determine the pressure bearing capacity of the expansion pipe after the expansion pipe is remedied further includes:

[0058] The system continues to move toward the lower end until the ground weight gauge shows that the positioning indicator has entered the expansion tube. The ground oil pipeline channel is closed and the annulus pressure test is carried out to test the pressure bearing capacity of the expansion tube after the expansion tube is refitted.

[0059] Further, in S2, the first pressure threshold is 30-40 MPa.

[0060] Further, in S3, pressurizing to reach a second pressure threshold so that the limit assembly automatically disengages and releases the restriction on the expansion tube in the radial direction includes:

[0061] Further pressurizing to 35-42 MPa breaks the shear pins of the suspension releaser, causes the locking block to retract radially, and the suspension releaser automatically releases the restriction on the expansion tube in radial direction.

[0062] The following is a further explanation of the method and steps of the present invention in conjunction with specific embodiments. Figure 1 The system structure shown in the figure includes the following specific implementation steps:

[0063] Step a: Install the burst plugging valve 2, the calibration gauge 9, the flexible expansion tool 10, the connecting oil pipe 15, the suspension release 12, and the expansion pipe 11 according to the structure;

[0064] Step b: On the ground, a hydraulic pump is connected to the valve core 3 through a hydraulic pipeline, and the pressure is increased to 2-3 MPa to expand and seal the flexible expansion tool 10 and the expansion tube 11, and the valve core pressure cap 4 is rotated to block the valve core liquid hole 5, and the expansion tool 10 remains expanded and sealed with the expansion tube 11;

[0065] Step c: further, the differential pressure valve 1 is connected to the burst plugging valve 2 by threads, and the adaptive in-pipe service system is transported to a predetermined well depth by the oil pipe;

[0066] Step d: positive cycle, press 35MPa to open the bursting disc 8 of the burst plugging valve 2, so that the pressure in the oil pipe enters the adaptive pipe service system through the radial hole 7, and further pressurizes to start the shear pin 14 of the suspension release device 12, and the locking block 13 retracts radially to release the restriction on the expansion pipe 11;

[0067] Step e: the ground pressure is increased to 45 MPa and maintained at a constant pressure for 10 minutes. The flexible expansion tool 10 is fully expanded, the expansion tube 11 is attached to the casing, and the ground pressure is released.

[0068] Step f: the flexible expansion tool returns to its original diameter after depressurization, the adaptive in-pipe service system moves downward, and step e is repeated until the expansion pipe 11 is completely attached to the casing;

[0069] Step g: the adaptive in-pipe service system continues to move downward until the calibration gauge 9 passes through the expansion pipe 11 section, so as to check the inner diameter of the expansion pipe 11 with a thickened patch;

[0070] Step h: the adaptive in-pipe service system continues to move downward, the surface weight indicator shows that the positioning indicator 16 enters the expansion pipe 11, the surface oil pipe channel is closed, and the annulus pressure test is performed to test the pressure bearing capacity of the expansion pipe 11 after the expansion pipe 11 is refitted;

[0071] Step i: Take out the differential pressure valve 1, the positioning indicator 16, the bursting plugging valve 2, the calibration gauge 9, the flexible expansion tool 10, the connecting oil pipe 15, and the suspension disconnector 12 to complete the construction work.

[0072] The above are exemplary embodiments disclosed in the present invention, but it should be noted that various changes and modifications may be made without departing from the scope disclosed in the embodiments of the present invention as defined in the claims. The functions, steps and / or actions of the method claims according to the disclosed embodiments described herein do not need to be performed in any particular order. In addition, although the elements disclosed in the embodiments of the present invention may be described or required in individual form, they may also be understood as multiple unless explicitly limited to the singular.

[0073] It should be understood that, as used herein, the singular forms "a", "an" are intended to include the plural forms as well, unless the context clearly supports an exception. It should also be understood that, as used herein, "and / or" refers to any and all possible combinations including one or more of the associated listed items.

[0074] The serial numbers of the embodiments disclosed in the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0075] A person skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the disclosure of the embodiments of the present invention (including the claims) is limited to these examples; under the concept of the embodiments of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the embodiments of the present invention as above, which are not provided in detail for the sake of simplicity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims

1. An adaptive in-pipe service system, characterized in that: include: In the axial direction of the pipeline, the burst plugging valve, the calibration gauge, the flexible expansion tool, the expansion pipe and the limit assembly are connected in sequence from the upper end to the lower end. Among them, the bursting plugging valve separates the pipeline of the service system into a first cavity and a second cavity in the axial direction, and a radial hole and a bursting piece for blocking the radial hole are further arranged on the pipe wall corresponding to the bursting plugging valve, and the bursting piece is arranged to burst when the pressure reaches a first threshold value, so that the oil pipe is connected with the inside of the service system through the radial hole; the flexible expansion tool is movably arranged in the expansion tube, and the flexible expansion tool expands and compresses the expansion tube in a pressurized state, and resets in an unpressurized state; the limit assembly is arranged on the radial outside of the expansion tube, and the limit assembly is arranged to release the radial limit on the expansion tube when the pressure in the system reaches a second threshold value.

2. The adaptive in-pipe service system according to claim 1, characterized in that: The burst plugging valve includes a valve core, a valve core pressure cap, and a valve core liquid hole. The hydraulic pump charges pressure into the second cavity through the valve core and the valve core liquid hole. The valve core pressure cap is detachably connected to the valve core liquid hole.

3. The adaptive in-pipe service system according to claim 1, characterized in that: A positioning indicator is further connected to the pipeline above the burst plugging valve.

4. The adaptive in-pipe service system according to claim 3, characterized in that: The upper end of the positioning indicator is further connected with a pressure differential valve, and the pressure differential valve is connected with the first cavity and the oil pipe.

5. The adaptive in-pipe service system according to claim 1, characterized in that: The limiting assembly includes a suspension disconnector and a locking block, wherein the suspension disconnector is arranged radially outside the expansion tube, and the locking block is arranged radially outside the suspension disconnector. When the pressure in the system reaches a second threshold, the suspension disconnector is released, and the locking block radially retracts to release the restriction on the suspension disconnector, thereby further releasing the restriction on the expansion tube.

6. The adaptive in-pipe service system according to claim 1, characterized in that: The calibration gauge comprises a gauge body, a variable diameter sliding body and a variable diameter driving device, wherein the variable diameter sliding body is arranged at the end of the gauge body.

7. A method for implementing an adaptive in-pipe service system, characterized in that: The method comprises performing the following steps based on the adaptive in-pipe service system according to any one of claims 1 to 6: Connect the hydraulic pump to the valve core of the blasting blocking valve on the ground, and seal it after pressurization to keep the flexible expansion tool and the expansion tube expanded and sealed; The service system is lowered to a predetermined position in the oil pipe, and pressurized to a first pressure threshold to break the bursting disc, so that the pressure in the oil pipe enters the adaptive service system through the radial hole; Further pressurizing to reach a second pressure threshold to disengage the limit assembly, thereby releasing the restriction on the expansion tube in the radial direction; Continue to increase the pressure to fully expand the flexible expansion tool so that the expansion tube is attached to the inner wall of the oil pipe. The flexible expansion tool releases pressure and moves to the lower end of the oil pipe. Repeat this step until the expansion tube is fully attached to the oil pipe. The system continues to move toward the lower end, so that the calibration gauge passes through the expansion pipe section; Close the surface oil pipeline channel and conduct an annular pressure test to test the pressure bearing capacity of the expansion pipe after the expansion pipe is refitted.

8. The implementation method of the adaptive in-pipe service system according to claim 7, characterized in that: Close the surface oil pipeline channel and conduct annular pressure test. The pressure bearing capacity of the expansion pipe after the expansion pipe is subsidized includes: The system continues to move toward the lower end until the ground weight gauge shows that the positioning indicator has entered the expansion tube. The ground oil pipeline channel is closed and the annulus pressure test is carried out to test the pressure bearing capacity of the expansion tube after the expansion tube is refitted.

9. The implementation method of the adaptive in-pipe service system according to claim 7, characterized in that: The first pressure threshold is 30-40 MPa.

10. The implementation method of the adaptive in-pipe service system according to claim 7, characterized in that: Further pressurizing to reach a second pressure threshold so that the limit assembly is disengaged and the restriction on the expansion tube in the radial direction is released includes: Further pressurizing to 35-42 MPa breaks the shear pins of the suspension release, causing the locking block to retract radially, the suspension release to release, and the radial restriction on the expansion tube to be released.

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