An adaptive in-pipe service system and implementation method
By using an adaptive in-pipe service system, pressure control is used to achieve adaptive deformation of the expansion pipe, which solves the problem of poor adaptability of the expansion pipe in wells with casing damage. This enables the repair of wells with casing damage to be completed in one tubing run, reducing operating costs and improving repair efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- PETROCHINA CO LTD
- Filing Date
- 2023-10-08
- Publication Date
- 2026-05-29
AI Technical Summary
Existing expansion tubing cannot effectively adapt to irregular wellbore shapes during casing damage repair, resulting in poor plugging adaptability. Furthermore, procedures such as subsidy and caliper changes cannot be completed in a single tubing run, increasing operational costs and difficulty.
An adaptive in-pipe service system is adopted, including a burst plugging valve, a flexible expansion tool, a limit component, and a calibration gauge. The expansion tube achieves adaptive deformation through pressure control, and the patching, calibrating, and pressure testing processes are completed in one tubing run.
It enables adaptive patching of expansion tubes in irregular wellbores, improving operational efficiency, reducing well completion costs, and enhancing the flexibility and success rate of casing damage repair.
Smart Images
Figure CN119777770B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of oilfield well workover technology, and in particular to an adaptive in-pipe service system and its implementation method. Background Technology
[0002] Expandable tubing patching technology is an important technique for repairing casing-damaged wells. Since 2009, according to incomplete statistics, over 70 casing-damaged wells have been repaired using this technology. However, in production applications, it has been found that wellbore irregularities, uneven surfaces, elliptical diameters, and bends exist, and the expandable tubing does not change shape with the wellbore. There is a need to address the current limitations of expandable tubing, which is constrained by the fixed-sizing expansion cone. The expandable tubing is shaped according to the expansion cone, failing to adapt well to wellbore morphology, resulting in poor adaptability for plugging and restricted application.
[0003] Patent application number 2017100836411 discloses a thin-walled expansion tube device and its operating method. This device directly connects a hydraulic cylinder to an expansion cone. When the expansion tube is long, a working tube can be used in the central tube above the hydraulic cylinder, reducing manufacturing costs. Furthermore, when the hydraulic cylinder completes one stroke by lifting the expansion cone, lowering the working tube resets the hydraulic cylinder, making operation convenient. However, its essence still relies on a conical expansion cone to cause radial deformation of the thin-walled expansion tube, which may encounter resistance when the sleeve undergoes slight deformation.
[0004] Therefore, there is a need to improve the existing expansion tube in-pipe service system and implementation method. Summary of the Invention
[0005] In view of this, the purpose of this invention is to propose an adaptive in-pipe service system and implementation method, which realizes the technology of completing the expansion pipe patching, calipering, and pressure testing in one tubing string. The process is simple, can repair wells with casing damage, avoids large resistance to expansion cone movement caused by irregular casing, has greater completion flexibility, and can significantly reduce completion costs.
[0006] To achieve the above objectives, embodiments of the present invention provide an adaptive intra-management service system, comprising:
[0007] Along the axial direction of the pipeline, from top to bottom, are connected sequentially a burst plugging valve, a calibration gauge, a flexible expansion tool, an expansion tube, and a limiting assembly.
[0008] The system includes a burst plugging valve that axially divides the pipeline of the service system into a first chamber and a second chamber. A radial hole and a bursting disc that blocks the radial hole are further provided on the pipe wall corresponding to the burst plugging valve. The bursting disc is designed to burst when the pressure reaches a first threshold, allowing the oil pipe to connect with the interior of the service system through the radial hole. A flexible expansion tool is movably disposed inside the expansion tube. The flexible expansion tool expands and compresses the expansion tube under pressurized conditions and resets when not pressurized. A limiting component is disposed radially outside the expansion tube. The limiting component is designed to release the radial limitation on the expansion tube when the pressure inside the system reaches a second threshold.
[0009] In some embodiments, the burst plugging valve includes a valve core, a valve core cap, and a valve core liquid passage hole. A hydraulic pump pressurizes the second cavity through the valve core and the valve core liquid passage hole. The valve core cap is detachably connected to the valve core liquid passage hole.
[0010] In some implementations, a positioning indicator is further connected to the pipe above the burst plug valve.
[0011] In some embodiments, a differential pressure valve is further connected to the upper end of the positioning indicator, and the differential pressure valve connects the first chamber and the oil pipe.
[0012] In some embodiments, the limiting assembly includes a suspension release device and a locking block. The suspension release device is located radially outside the expansion tube, and the locking block is located radially outside the suspension release device. When the pressure in the system reaches a second threshold, the suspension release device is released, and the locking block retracts radially to release the restriction on the suspension release device, thereby further releasing the restriction on the expansion tube.
[0013] In some embodiments, the calibration gauge includes a gauge body, a variable diameter slider, and a variable diameter drive device, with the variable diameter slider disposed at the end of the gauge body.
[0014] In another aspect, the present invention provides a method for implementing an adaptive intra-pipe service system, comprising performing the following steps based on the aforementioned adaptive intra-pipe service system:
[0015] Connect the hydraulic pump to the valve core of the burst plug valve on the ground, pressurize and then plug to keep the flexible expansion tool and expansion tube in an expanded seal;
[0016] The service system is lowered to the predetermined position inside the tubing, and the pressure is increased to the first pressure threshold to break the rupture disc, so that the pressure inside the tubing enters the adaptive service system through the radial hole;
[0017] Further pressurization is applied to reach the second pressure threshold, causing the limiting component to disengage and release the radial restriction on the expansion tube;
[0018] Continue to increase the pressure to allow the expansion tube to fully expand and attach to the inner wall of the tubing through the flexible expansion tool. Depressurize the flexible expansion tool and move it to the lower end of the tubing. Repeat this step until the expansion tube is fully attached to the tubing.
[0019] The system continues to move downwards, allowing the calibration gauge to pass through the expansion pipe section;
[0020] Close the ground oil pipeline channel and perform annular pressure testing to assess the pressure-bearing capacity of the expansion tube after it has been subsidized.
[0021] In some implementations, after closing the surface oil pipeline passage, the pressure-bearing capacity of the expansion tube after annular pressure testing includes:
[0022] The system continues to move downwards until the ground weight indicator shows that the positioning indicator has entered the expansion tube. The ground oil pipe channel is then closed, and the annular pressure test is performed to assess the pressure-bearing capacity of the expansion tube after it has been fitted with padding.
[0023] In some implementations, the first pressure threshold is 30–40 MPa.
[0024] In some embodiments, further pressurizing to a second pressure threshold to disengage the limiting assembly and release the radial restriction on the expansion tube includes:
[0025] Further pressurize to 35-42 MPa to break the shear pins of the suspension release device, causing the locking block to retract radially, the suspension release device to disengage, and the radial restriction on the expansion tube to be released.
[0026] The present invention has at least the following beneficial technical effects:
[0027] This invention enables the completion of expansion tube patching, borehole filling, and pressure testing in a single tubing run. Based on the plastic deformation characteristics of metals, it utilizes bulging technology to force the metal to adapt to the wellbore wall, allowing the metal to conform to irregular well diameters and achieve complete engagement. This results in a larger reconstructed borehole diameter, higher pressure resistance, no need for drill plugs, and high operational efficiency, forming a completely new wellbore reconstruction technology for old wells. It is more adaptable to patching wells with casing damage, achieving the goals of reducing operating costs and increasing patching success rates. The system and method of this invention are simple in process, capable of repairing wells with casing damage, avoiding high resistance to expansion cone movement caused by casing irregularities, providing greater well completion flexibility, and significantly reducing well completion costs. Attached Figure Description
[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.
[0029] Figure 1 A schematic diagram of an embodiment of the adaptive intra-pipe service system provided by the present invention;
[0030] Figure 2 An enlarged schematic diagram of the first part of the adaptive intra-pipe service system provided by the present invention;
[0031] Figure 3 This is an enlarged schematic diagram of the second part of the adaptive intra-pipe service system provided by the present invention.
[0032] Figure 4 This is an enlarged schematic diagram of the third part of the adaptive intra-pipe service system provided by the present invention.
[0033] Explanation of reference numerals in the attached figures:
[0034] 1-Differential pressure valve, 2-Blast plug valve, 3-Valve core, 4-Rotary valve core cap, 5-Valve core fluid passage hole, 6-Plug, 7-Radial hole, 8-Blast disc, 9-Verification gauge, 10-Flexible expansion tool, 11-Expansion tube, 12-Suspension release device, 13-Locking block, 14-Shear pin, 15-Connecting oil pipe, 16-Positioning indicator. Detailed Implementation
[0035] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to specific examples and the accompanying drawings.
[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as “length,” “width,” “upper,” “lower,” “left,” “right,” “front,” “rear,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer” indicate orientations or positions based on the orientations or positions shown in the accompanying drawings and are for ease of description only, and should not be construed as limiting the technical solution.
[0037] The terms "comprising" and "having," and any variations thereof, used in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion; the terms "first," "second," etc., used in the specification, claims, and accompanying drawings are used to distinguish different objects, not to describe a particular order. "A plurality of" means two or more, unless otherwise explicitly specified.
[0038] In the description and claims of this invention and the foregoing drawings, when an element is referred to as "fixed to," "mounted to," "disposed on," or "connected to" another element, it can be located directly or indirectly on that other element. For example, when an element is referred to as "connected to" another element, it can be directly or indirectly connected to that other element.
[0039] Furthermore, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0040] In existing oil well production applications, irregularities such as uneven inner walls, elliptical well diameters, and bends have been found in the wellbore. Furthermore, existing well patching technologies are constrained by the sizing of the expansion tube, which is shaped according to the expansion tube. This expansion tube is prone to jamming at irregular locations, failing to adapt well to wellbore shapes, resulting in poor adaptability to expansion tube plugging and limited application. Moreover, the patching and sizing procedures for expansion tubes in existing technologies are often not completed in a single pass, being time-consuming and labor-intensive. To address the problems existing in the prior art, this invention provides an adaptive in-pipe service system and implementation method, such as... Figure 1 The figure shown is an adaptive intra-pipe service system provided by the present invention. Figure 2-4 This is an enlarged schematic diagram of the adaptive pipeline service system. The service system is divided into three parts along the axis: the first part, the second part, and the third part. The diagram is only for the purpose of showing the details of the service system structure and is not intended to 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 tube 11, and a limit assembly, which are connected sequentially from top to bottom along the axial direction of the pipe.
[0042] The burst-blocking valve 2 axially divides the service system's piping into a first chamber and a second chamber, such as... Figure 1As shown, the left side of the burst plugging valve 2 is the first cavity, and the right side is the second cavity. A radial hole 7 and a rupture disc 8 blocking the radial hole 7 are further provided on the pipe wall corresponding to the burst plugging valve 2. The rupture disc 8 is configured to automatically burst when the pressure reaches a first threshold, allowing the oil pipe to connect with the service system through the radial hole 7. A flexible expansion tool 10 is movably disposed within the expansion tube 11. The flexible expansion tool 10 expands and compresses the expansion tube 11 under pressurized conditions and automatically resets when not pressurized. A limiting component is disposed radially outside the expansion tube. The limiting component is configured to automatically release the radial limitation on the expansion tube when the system pressure reaches a second threshold. In some embodiments of the present invention, the flexible expansion tool 10 can be a longitudinally elongated sac-like structure made of polymer composite material, which can deform under internal pressure and provide expansion pressure outward.
[0043] Furthermore, a positioning indicator 16 is further connected to the pipe above the burst plug valve 2.
[0044] Furthermore, a differential pressure valve 1 is further connected to the upper end of the positioning indicator 16, and the differential pressure valve 1 connects the first cavity and the oil pipe.
[0045] Differential pressure valve 1, positioning indicator 16, burst plugging valve 2, calibration gauge 9, flexible expansion tool 10, connecting oil pipe 15, and suspension disconnector 12 are connected by threads from top to bottom.
[0046] Furthermore, such as Figure 2 The enlarged schematic diagram of the first part shows that the burst plugging valve 2 includes a valve core 3, a valve core cap 4, and a valve core liquid passage hole 5. The hydraulic pump pressurizes the second cavity through the valve core 3 and the valve core liquid passage hole 5. The valve core cap 4 is detachably connected to the valve core liquid passage hole 5. In some embodiments, the valve core cap 4 is rotatably connected. When the hydraulic pump pressurizes the second cavity through the valve core 3 and the liquid passage hole 5, it pressurizes the expansion tube 11 of the flexible expansion tool 10. By rotating and tightening the valve core cap 4, the plugging can be continuously maintained in an expansion state. Reverse rotation of the valve core cap 5 can release the pressure.
[0047] Furthermore, such as Figure 4The enlarged schematic diagram of the third part shows that the limiting component includes a suspension release device 12 and a locking block 13. The suspension release device 12 is located radially outside the expansion tube 11, and the locking block 13 is located radially outside the suspension release device 12. When the pressure in the system reaches the second threshold, the shear pin 14 on the suspension release device 12 automatically disconnects, and the locking block 13 retracts radially to release the restriction on the suspension release device 12, thereby further releasing the restriction on the expansion tube 11. In some embodiments, pressure is applied to open the rupture disc 8 of the burst plug valve 2, allowing the pressure in the oil pipe to enter the adaptive in-pipe service system through the radial hole 7, further increasing the pressure intensity, activating the shear pin 14 of the suspension release device 12, and the locking block 13 retracts radially to release the restriction on the expansion tube 11. This invention achieves the fixation of the initial position of the expansion tube through the limiting component, and can also automatically release the restriction on the position of the expansion tube through pressure, effectively reducing the difficulty of 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 drive device, with the variable diameter sliding body located at the end of the gauge body. The variable diameter function is achieved through pressure application. The variable diameter sliding body can quickly adapt and change based on the actual dimensions within the well and the well patching situation. Moreover, this invention integrates the calibration gauge and expansion tool into a single service system, enabling gauge inspection on a single pipe run after patching, significantly reducing operational complexity.
[0049] In some embodiments, a hydraulic pump is connected to the valve core 3 via a hydraulic line on the ground. Pressure is applied at 2-3 MPa to seal the flexible expansion tool 10 and the expansion tube 11. The valve core cap 4 is rotated to block the valve core fluid passage 5, maintaining the seal between the expansion tool 10 and the expansion tube 11. Further, the differential pressure valve 1 and the burst plugging valve 2 are threaded together, and the adaptive in-line service system is delivered to the predetermined well depth via tubing. During positive circulation, pressure is applied to open the burst disc 8 of the burst plugging valve 2, allowing the tubing pressure to enter the adaptive in-line service system through the radial hole 7. Further pressure is applied to activate the suspension release device 12 and shear pin 14, causing the locking block 13 to retract radially and release the restriction on the expansion tube 11. On the ground, the pressure is increased and stabilized for 10 minutes to allow full expansion, extending the expansion tube 1... 1. The expansion tube 11 is attached to the casing, and the ground pressure is released. The adaptive in-pipe service system moves downward by half the rubber sleeve of the flexible expansion tool 10 until the expansion tube 11 is completely attached 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 after the attachment. The adaptive in-pipe service system continues to move downward, and the ground weight indicator shows that the positioning indicator 16 has entered the expansion tube 11. The ground oil pipe channel is closed, and the annular pressure test is performed to test the pressure bearing capacity of the expansion tube 11 after attachment. The differential pressure valve 1, positioning indicator 16, burst plugging valve 2, calibration gauge 9, flexible expansion tool 10, connecting oil pipe 15, and suspension disconnector 12 are removed to complete the construction operation.
[0050] In another aspect, the present invention provides a method for implementing an adaptive intra-pipe service system, comprising performing the following steps based on the aforementioned adaptive intra-pipe service system:
[0051] S1 connects the hydraulic pump to the valve core of the burst plug valve on the ground, pressurizes and then plugs it to keep the flexible expansion tool and expansion tube in an expanded seal;
[0052] S2 lowers the service system to a predetermined position inside the tubing, pressurizes it to the first pressure threshold to break the rupture disc, and allows the pressure inside the tubing to enter the adaptive service system through the radial hole;
[0053] S3 further pressurizes to reach the second pressure threshold, causing the limiting component to automatically disengage and release the radial restriction on the expansion tube;
[0054] S4 continues to pressurize so that the expansion tube is fully expanded by the flexible expansion tool and attached to the inner wall of the tubing. The flexible expansion tool is depressurized and moved to the lower end of the tubing. This step is repeated until the expansion tube is fully attached to the tubing.
[0055] The S5 system continues to move downwards, allowing the calibration gauge to pass through the expansion tube section;
[0056] S6 closes the ground oil pipeline channel and performs an annular pressure test to assess the pressure-bearing capacity of the expansion tube after it has been subsidized.
[0057] In some embodiments, the service system also includes a positioning indicator; therefore, in S6, closing the ground oil pipeline channel and the pressure-bearing capacity of the annular pressure test expansion tube after patching further includes:
[0058] The system continues to move downwards until the ground weight indicator shows that the positioning indicator has entered the expansion tube. The ground oil pipe channel is then closed, and the annular pressure test is performed to assess the pressure-bearing capacity of the expansion tube after it has been fitted with padding.
[0059] Furthermore, in S2, the first pressure threshold is 30–40 MPa.
[0060] Furthermore, in S3, pressurizing to reach the second pressure threshold to automatically disengage the limiting assembly and release the radial restriction on the expansion tube includes:
[0061] Further pressurization to 35-42 MPa breaks the shear pins of the suspension release device, the locking block retracts radially, and the suspension release device automatically disengages, releasing the radial restriction on the expansion tube.
[0062] The method steps of this invention will be further explained below with reference to specific embodiments, and applications such as... Figure 1 The system structure shown includes the following specific implementation steps:
[0063] Step a: Install the burst plugging valve 2, calibration gauge 9, flexible expansion tool 10, connecting oil pipe 15, suspension disconnector 12, and expansion pipe 11 according to the structure described above;
[0064] Step b: Connect the hydraulic pump to the valve core 3 on the ground through the hydraulic line, pressurize to 2-3 MPa to make the flexible expansion tool 10 and the expansion tube 11 expand and seal, rotate the valve core cap 4 to block the valve core liquid passage 5, and keep the expansion tool 10 and the expansion tube 11 expanded and sealed.
[0065] Step c: Further differential pressure valve 1 and burst plugging valve 2 are connected by threads, and the adaptive in-line service system is delivered to the predetermined well depth via tubing;
[0066] Step d: Positive circulation, pressurize 35MPa to open the bursting disc 8 of the bursting plug valve 2, so that the pressure in the oil pipe enters the adaptive pipe service system through the radial hole 7, further pressurize to start the suspension release device 12 shear pin 14, and the locking block 13 retracts radially to release the restriction on the expansion tube 11.
[0067] Step e: Increase the ground pressure to 45MPa, stabilize the pressure for 10 minutes, fully expand the flexible expansion tool 10, attach the expansion tube 11 to the sleeve, and depressurize the ground.
[0068] Step f: After the flexible expansion tool is depressurized, it returns to its original diameter. The adaptive in-tube service system moves downward. Repeat step e until the expansion tube 11 is fully attached to the sleeve.
[0069] Step g: The adaptive pipe service system continues to move downwards until the calibration gauge 9 passes through the expansion pipe 11 section, which is used to check the inner diameter of the expansion pipe 11 with the padding thickness.
[0070] Step h: The adaptive in-pipe service system continues to move downwards, the ground weight indicator shows that the positioning indicator 16 has entered the expansion pipe 11, the ground oil pipe channel is closed, and the annular pressure test is performed to test the pressure bearing capacity of the expansion pipe 11 after the subsidy.
[0071] Step i: Remove differential pressure valve 1, positioning indicator 16, burst plugging valve 2, calibration gauge 9, flexible expansion tool 10, connecting oil pipe 15, and suspension disconnector 12 to complete the construction operation.
[0072] The above are exemplary embodiments disclosed in this invention. However, it should be noted that various changes and modifications can be made without departing from the scope of the embodiments of this invention as defined by the claims. The functions, steps, and / or actions of the methods according to the disclosed embodiments described herein do not need to be performed in any particular order. Furthermore, although the elements disclosed in the embodiments of this invention may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular number.
[0073] It should be understood that, as used herein, the singular form “a” is intended to include the plural form 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 of one or more of the associated listed items.
[0074] The embodiment numbers disclosed in the above embodiments of the present invention are merely for description and do not represent the superiority or inferiority of the embodiments.
[0075] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples. Within the framework of the invention, technical features of the above embodiments or different embodiments can be combined, and many other variations of different aspects of the invention exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.
Claims
1. An adaptive intra-pipe service system, characterized in that, include: Along the axial direction of the pipeline, from top to bottom, are connected sequentially a burst plugging valve, a calibration gauge, a flexible expansion tool, an expansion tube, and a limiting assembly. The burst plugging valve axially divides the pipeline of the service system into a first chamber and a second chamber. A radial hole and a bursting disc blocking the radial hole are further provided on the pipe wall corresponding to the burst plugging valve. The bursting disc is configured to burst when the pressure reaches a first threshold, allowing the oil pipe to communicate with the interior of the service system through the radial hole. A flexible expansion tool is movably disposed within the expansion tube. The flexible expansion tool expands and compresses the expansion tube under pressurized conditions and resets under unpressurized conditions. A limiting component is disposed radially outside the expansion tube. The limiting component is configured to release the radial limitation on the expansion tube when the pressure within the system reaches a second threshold. The burst plugging valve includes a valve core, a valve core cap, and a valve core liquid passage hole. The hydraulic pump pressurizes the second cavity through the valve core and the valve core liquid passage hole. The valve core cap is detachably connected to the valve core liquid passage hole. The limiting assembly includes a suspension release device and a locking block. The suspension release device is located radially outside the expansion tube, and the locking block is located radially outside the suspension release device. When the pressure in the system reaches a second threshold, the suspension release device is released, and the locking block retracts radially to release the restriction on the suspension release device, thereby further releasing the restriction on the expansion tube.
2. The adaptive intra-pipe service system according to claim 1, characterized in that, A positioning indicator is further connected to the pipe above the rupture plugging valve.
3. The adaptive intra-pipe service system according to claim 2, characterized in that, The upper end of the positioning indicator is further connected to a differential pressure valve, which connects the first cavity and the oil pipe.
4. The adaptive intra-pipe service system according to claim 1, characterized in that, The calibration gauge includes a gauge body, a variable diameter slider, and a variable diameter drive device, wherein the variable diameter slider is disposed at the end of the gauge body.
5. An implementation method for an adaptive intra-system service system, characterized in that, The adaptive intra-pipe service system according to any one of claims 1 to 4 includes performing the following steps: Connect the hydraulic pump to the valve core of the burst plug valve on the ground, pressurize and then plug to keep the flexible expansion tool and expansion tube in an expanded seal; The service system is lowered to the predetermined position inside the tubing, and the pressure is increased to the first pressure threshold to break the rupture disc, so that the pressure inside the tubing enters the adaptive service system through the radial hole; Further pressurization is applied to reach the second pressure threshold to disengage the limiting component and release the radial restriction on the expansion tube; Continue to increase the pressure to allow the expansion tube to fully expand and attach to the inner wall of the tubing through the flexible expansion tool. Depressurize the flexible expansion tool and move it to the lower end of the tubing. Repeat this step until the expansion tube is fully attached to the tubing. The system continues to move downwards, allowing the calibration gauge to pass through the expansion pipe section; Close the ground oil pipeline channel and perform annular pressure testing to assess the pressure-bearing capacity of the expansion tube after it has been subsidized.
6. The implementation method of the adaptive intra-pipe service system according to claim 5, characterized in that, After closing the surface oil pipeline access, the pressure-bearing capacity of the expansion tube after the annular pressure test, including: The system continues to move downwards until the ground weight indicator shows that the positioning indicator has entered the expansion tube. The ground oil pipe channel is then closed, and the annular pressure test is performed to assess the pressure-bearing capacity of the expansion tube after it has been fitted with padding.
7. The implementation method of the adaptive intra-pipe service system according to claim 5, characterized in that, The first pressure threshold is 30~40MPa.
8. The implementation method of the adaptive intra-pipe service system according to claim 5, characterized in that, Further pressurization to reach the second pressure threshold to disengage the limiting assembly and release the radial restriction on the expansion tube includes: Further pressurize to 35~42MPa to break the shear pin of the suspension release device, causing the locking block to retract radially, the suspension release device to disengage, and the radial restriction on the expansion tube to be released.