Returnable leakage detection device for underground oil pipe

Abstract

The utility model discloses an underground oil pipe recoverable leakage detection device, which comprises a leakage detection seat assembly and a leakage detection rod assembly, the leakage detection seat assembly and an underground oil pipe are installed together, the leakage detection rod assembly is inserted in the leakage detection seat assembly, the leakage detection rod assembly comprises a conical shell, and a support plate II is installed in the conical shell through a bolt; according to the utility model, the weighing sensor, the guide rod, the baffle plate, the sealing seat, the camera module, the illuminating lamp and the control transmission module are integrated in the leakage detection rod assembly and are electrically connected, so that the stress state of the sealing seat in the leakage detection process can be accurately monitored in real time to reflect the sealing performance, and visual information in a shaft can be obtained through the camera module; meanwhile, the control transmission module can process, store and upload the key data in real time, the problems that in the prior art, real-time monitoring and data feedback are lacked, and sealing failure or inaccurate judgment is caused due to the fact that the precision is insufficient due to the fact that a single air bag is depended on are effectively solved, and the reliability of leakage detection and the comprehensiveness of information obtaining are greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of oil well workover technology, specifically to a downhole tubing returnable leak detection device. Background Technology

[0002] The downhole tubing returnable leak detection device is a tool specifically designed for oilfield workover operations. It is used to test the sealing of the tubing string without retrieving the tubing. After completion, the device can be returned to the surface, significantly improving operational efficiency and reducing costs. Through its innovative design of "pressurized leak detection + fluid backflow," the downhole tubing returnable leak detection device solves the pain point of traditional tubing inspection requiring the retrieving of the tubing string, and has become a key tool for efficient oilfield workover operations.

[0003] For example, patent application CN202422882496.1, with an authorization announcement date of 20241224, discloses a downhole tubing returnable leak detection device. This device includes a leak detection base and a central connecting rod inserted into the base. A retaining ball is fixedly fitted to the bottom of the central connecting rod, and an elastic air bladder is wrapped around the retaining ball. An air storage chamber is formed inside the retaining ball, and multiple annularly distributed air guide holes communicating with the elastic air bladder are formed on the side wall near the bottom of the air storage chamber. The downhole tubing returnable leak detection device provided by this invention utilizes the flexible inflation or deflation of the elastic air bladder to change the connection strength between it and the leak detection base. This makes it easy to fix and separate the leak detection rod structure from the leak detection base, facilitating the recovery of the leak detection rod structure. Furthermore, after the leak detection rod structure is recovered, there is no need to replace the construction tubing string, making construction convenient.

[0004] However, the existing downhole tubing returnable leak detection device relies on the inflation and deflation of airbags to adjust the connection strength, but the accuracy is insufficient and it is easy to cause sealing failure or recovery failure. In addition, it lacks integrated real-time monitoring components such as cameras and sensors, and cannot provide real-time data feedback during the leak detection process. Therefore, it is urgent to design a downhole tubing returnable leak detection device to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a downhole tubing returnable leak detection device to address the aforementioned shortcomings in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A reversible leak detection device for downhole tubing includes a leak detection seat assembly and a leak detection rod assembly. The leak detection seat assembly is installed together with the downhole tubing. The leak detection rod assembly is inserted into the leak detection seat assembly. The leak detection rod assembly includes a conical shell. A support plate is bolted to the inside of the conical shell. A load cell is bolted to the top center of the support plate. A guide rod is slidably inserted inside the load cell. A baffle is integrally formed at the bottom end of the guide rod, and the baffle is in contact with the support plate. A sealing seat is bolted to the top end of the guide rod, and the sealing seat is slidably inserted into the top end of the conical shell. A piston seat is threaded at the top, and a mounting shell is bolted to the top of the piston seat. Camera modules are embedded on both sides of the inner wall of the mounting shell, and two lighting lamps are embedded on each of the other two sides of the inner wall of the mounting shell. A control transmission module is bolted inside the mounting shell, and the control transmission module is electrically connected to the weighing sensor via a wire. A connection terminal is bolted to the top of the inner wall of the mounting shell, and the connection terminal is electrically connected to the control transmission module. A connection cable is electrically connected to the top of the control transmission module. A solenoid valve is embedded on the outer wall of one side of the bottom of the piston seat, and the solenoid valve is electrically connected to the control transmission module via a wire.

[0008] Furthermore, the top of the mounting shell is integrally formed with four mounting plates, and each of the four mounting plates has a connecting rope installed on one side of its top by bolts. One end of each of the four connecting ropes is installed on a connecting cable.

[0009] Furthermore, a support plate is bolted inside the conical shell, and a pump control module is bolted to one side of the bottom of the support plate. The pump control module is electrically connected to the control transmission module via wires.

[0010] Furthermore, a battery module is bolted to the outer wall of one side of the top of the support plate, and the battery module is electrically connected to the control transmission module, the weighing sensor, and the pump control module through wires.

[0011] Furthermore, a rubber airbag is bolted to the bottom of the conical shell, and a pump body is bolted to the bottom of the inner wall of the conical shell. The pump body is connected to the rubber airbag through a pipe, and the pump body is electrically connected to the pump body control module through a wire.

[0012] Furthermore, the leak detection seat assembly includes a leak detection seat, the top of which has a cavity, and the conical shell is inserted into the cavity.

[0013] Furthermore, a limiting cavity is provided at the center of the bottom end of the leak detection seat, and the limiting cavity is interconnected with the cavity body, with the rubber airbag being engaged inside the limiting cavity.

[0014] In the above technical solution, the downhole tubing returnable leak detection device provided by this utility model has the following advantages:

[0015] (1) This utility model integrates a weighing sensor, guide rod, baffle, sealing seat, camera module, lighting lamp and control transmission module into the leak detection rod assembly and realizes their electrical connection. It can monitor the stress state of the sealing seat during the leak detection process in real time and accurately, reflect the sealing performance, and obtain visual information inside the well barrel through the camera module. At the same time, the control transmission module can process, store and upload these key data in real time. It effectively solves the problems of lack of real-time monitoring and data feedback in the prior art, and the insufficient accuracy of relying on a single airbag, which leads to sealing failure or inaccurate judgment. It greatly improves the reliability of leak detection and the comprehensiveness of information acquisition.

[0016] (2) The design of the mounting plate and connecting rope makes it easy to fix the leak detection rod assembly to the connecting cable, which simplifies the recovery operation of the device. The connecting rope provides redundant connection points to ensure that the device can stably return to the ground in complex underground environments, avoiding the risk of failure caused by insufficient accuracy of traditional airbag recovery mechanisms, and improving operational safety and reusability.

[0017] (3) This utility model combines a pump control module, a battery module and a rubber airbag. The pump precisely controls the inflation and deflation of the airbag, making the expansion and contraction process of the airbag controllable and stable. The battery module provides stable power support, optimizes the recycling mechanism, and solves the problem in the background technology that "insufficient accuracy of the recycling mechanism can easily lead to sealing failure or recycling failure". The cooperation between the airbag and the limiting cavity enhances the accuracy of the connection strength adjustment and reduces the failure rate. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 This is a schematic diagram of the overall structure of an embodiment of a downhole tubing returnable leak detection device according to the present invention.

[0020] Figure 2 This is a schematic diagram of the leak detection seat assembly provided in an embodiment of a downhole tubing returnable leak detection device of this utility model.

[0021] Figure 3 This is a schematic diagram of the leak detection rod assembly provided in an embodiment of a downhole tubing returnable leak detection device of this utility model.

[0022] Figure 4This is a schematic diagram of the internal structure of the conical shell, piston seat, and mounting shell provided in an embodiment of a downhole tubing returnable leak detection device of this utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Leak test seat assembly; 2. Leak test rod assembly; 3. Leak test seat; 4. Cavity; 5. Limiting cavity; 6. Conical shell; 7. Rubber airbag; 8. Piston seat; 9. Mounting shell; 10. Lighting lamp; 11. Camera module; 12. Mounting plate; 13. Connecting cable; 14. Connecting rope; 15. Support plate one; 16. Pump body; 17. Pump body control module; 18. Battery module; 19. Support plate two; 20. Weighing sensor; 21. Guide rod; 22. Baffle; 23. Sealing seat; 24. Control transmission module; 25. Connecting terminal; 26. Solenoid valve. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0026] like Figure 1-4 As shown in the figure, this utility model provides a downhole tubing returnable leak detection device, including a leak detection seat assembly 1 and a leak detection rod assembly 2. The leak detection seat assembly 1 is installed together with the downhole tubing, and the leak detection rod assembly 2 is inserted into the leak detection seat assembly 1. The leak detection rod assembly 2 includes a conical shell 6, and a support plate 29 is bolted to the inside of the conical shell 6. A weighing sensor 20 is bolted to the top center of the support plate 29. A guide rod 21 is slidably inserted into the weighing sensor 20, and a baffle 22 is integrally formed at the bottom end of the guide rod 21. The baffle 22 is in contact with the support plate 29. A sealing seat 23 is bolted to the top end of the guide rod 21, and the sealing seat 23 is slidably inserted into the top end of the conical shell 6. A piston seat 8 is threadedly connected to the top of the sealing seat 23, and a mounting shell 9 is bolted to the top of the piston seat 8. Camera modules 11 are embedded on both sides of the inner wall of the mounting shell 9, and two lighting lamps 10 are embedded on each of the other two sides of the inner wall of the mounting shell 9. A control transmission module 24 is bolted to the inside of the mounting shell 9, and the control transmission module 24 is electrically connected to the weighing sensor 20 via a wire. A connection terminal 25 is bolted to the top of the inner wall of the mounting shell 9, and the connection terminal 25 is electrically connected to the control transmission module 24. A connection cable 13 is electrically connected to the top of the control transmission module 24. A solenoid valve 26 is embedded on the outer wall of one side of the bottom of the piston seat 8, and the solenoid valve 26 is electrically connected to the control transmission module 24 via a wire.

[0027] Specifically, in this embodiment, a leak detection seat assembly 1 and a leak detection rod assembly 2 are included. The leak detection seat assembly 1 is installed together with the downhole tubing. The leak detection rod assembly 2 is inserted into the leak detection seat assembly 1. The leak detection rod assembly 2 includes a conical shell 6. A support plate 29 is bolted to the inside of the conical shell 6, and a load cell 20 is bolted to the top center of the support plate 29. The load cell 20 is preferably a Kistler 601CAA model. The load cell 20 detects pressure change data in real time and transmits it to the control transmission module 24 for processing and analysis via wires. If the pressure drops abnormally, This indicates a leak; a guide rod 21 is slidably inserted inside the load cell 20, and a baffle 22 is integrally formed at the bottom end of the guide rod 21. The baffle 22 is in contact with the support plate 19. A sealing seat 23 is bolted to the top of the guide rod 21, and the sealing seat 23 is slidably inserted into the top of the conical shell 6. A piston seat 8 is threaded to the top of the sealing seat 23, and a mounting shell 9 is bolted to the top of the piston seat 8. Camera modules 11 are embedded on both sides of the inner wall of the mounting shell 9. The camera modules 11 are preferably downhole high-definition imaging modules, model SchlumbergerVisiTrak. TM Two lighting lamps 10 are embedded on each of the two sides of the inner wall of the mounting housing 9. The preferred model of the lighting lamps 10 is OceanLED Epsilon 12V LED cold light source. The lighting lamps 10 illuminate the wellbore environment. The camera module 11 captures images of the inner wall of the tubing and the joints. The image data is stored by the control transmission module 24 and uploaded to the ground system in real time through the connecting cable 13 to assist in locating the leak point. The control transmission module 24 is bolted inside the mounting housing 9. The control transmission module 24 is a central processing unit, model TIAM64x industrial-grade SoC. The control transmission module 24 sends a command to the pump body control module 17 to start the pump body 16. The pump body 16 injects gas into the rubber air bag 7 through the pipeline, causing it to expand in the limiting cavity 5, forming a mechanical lock and high-pressure seal, and tightly fixing the leak detection rod assembly 2 to the leak detection seat 3. The control transmission module 24 is connected to the weighing sensor through the wire. The device 20 is electrically connected. A connection terminal 25 is bolted to the top of the inner wall of the mounting housing 9 and is electrically connected to the control transmission module 24. A connection cable 13 is electrically connected to the top of the control transmission module 24. The connection terminal 25 ensures that the signal transmission between the connection cable 13 and the control transmission module 24 is unobstructed. A solenoid valve 26 is embedded in the outer wall of one side of the bottom of the piston seat 8. The preferred model of the solenoid valve 26 is ASCO8262G series. The solenoid valve 26 adjusts the opening and closing of the fluid channel between the upper and lower parts of the piston seat 8 according to the command of the control transmission module 24 to help maintain the sealing pressure balance. After the leak test is completed, the control transmission module 24 triggers the solenoid valve 26 to open and release pressure. The liquid above the piston seat 8 flows into the lower part of the piston seat 8. Under the buoyancy of the liquid, the leak test rod assembly 2 will rise. The solenoid valve 26 is electrically connected to the control transmission module 24 through a wire.

[0028] This utility model provides a downhole tubing returnable leak detection device, which integrates a weighing sensor 20, guide rod 21, baffle 22, sealing seat 23, camera module 11, lighting lamp 10, and control transmission module 24 into the leak detection rod assembly 2 and achieves electrical connection between them. It can monitor the stress state of the sealing seat 23 in real time and accurately during the leak detection process, and obtain visual information inside the wellbore through the camera module 11. At the same time, the control transmission module 24 can process, store, and upload these key data in real time. It effectively solves the problems of lack of real-time monitoring and data feedback in the prior art, and the insufficient accuracy of relying on a single airbag, which leads to sealing failure or inaccurate judgment. It greatly improves the reliability of leak detection and the comprehensiveness of information acquisition.

[0029] In one embodiment provided by this utility model, such as Figure 3-4 As shown, the top of the mounting shell 9 is integrally formed with four mounting plates 12, and each of the four mounting plates 12 has a connecting rope 14 installed on one side of its top by bolts. One end of each of the four connecting ropes 14 is installed on the connecting cable 13.

[0030] In another embodiment provided by this utility model, such as Figure 3-4 As shown, a support plate 15 is bolted inside the conical shell 6, and a pump control module 17 is bolted to one side of the bottom of the support plate 15. The pump control module 17 is preferably an embedded PID controller, model National Instruments CRIO-9045. The control transmission module 24 sends a command to the pump control module 17 to start the pump 16. The pump 16 injects gas into the rubber airbag 7 through a pipe, causing it to expand within the limiting cavity 5, forming a mechanical lock and high-pressure seal, and tightly fixing the leak detection rod assembly 2 to the leak detection seat 3. The pump control module 17 is electrically connected to the control transmission module 24 via a wire. A battery module 18 is bolted to the outer wall of the top side of the support plate 15. The battery module 18 is preferably a lithium thionyl chloride battery, model Ta. The diranSL-2780 uses a battery module 18 to power the control transmission module 24, the weighing sensor 20, the pump control module 17, and the camera module 11. The battery module 18 is electrically connected to the control transmission module 24, the weighing sensor 20, and the pump control module 17 via wires. A rubber airbag 7 is bolted to the bottom of the conical shell 6, and a pump body 16 is bolted to the bottom of the inner wall of the conical shell 6. The pump body 16 is preferably a micro gear pump with an oil-resistant design, model HaskelAGD-1. The control transmission module 24 issues a command, and the pump control module 17 starts the pump body 16. The pump body 16 fills the rubber airbag 7 with fluid through a pipe. The pump body 16 is interconnected with the rubber airbag 7 through a pipe, and is electrically connected to the pump control module 17 via wires.

[0031] In another embodiment provided by this utility model, such as Figure 2As shown, the leak detection seat assembly 1 includes a leak detection seat 3, with a cavity 4 at the top of the leak detection seat 3. A conical shell 6 is precisely inserted into the cavity 4 at the top of the leak detection seat 3, and the cavity 4 provides initial guidance. The conical shell 6 is inserted into the cavity 4. A limiting cavity 5 is opened at the center of the bottom end of the leak detection seat 3. The rubber airbag 7 is controlled to expand in the limiting cavity 5, forming a mechanical lock with the inner wall of the limiting cavity 5. At the same time, it pushes the conical shell 6 upward to press against the top of the cavity 4 to achieve high-pressure sealing. The limiting cavity 5 and the cavity 4 are interconnected, and the rubber airbag 7 is engaged inside the limiting cavity 5.

[0032] Example 1

[0033] A downhole tubing returnable leak detection device includes a leak detection seat assembly 1 and a leak detection rod assembly 2. The leak detection seat assembly 1 is installed together with the downhole tubing, and the leak detection rod assembly 2 is inserted into the leak detection seat assembly 1. The leak detection rod assembly 2 includes a conical shell 6, and a support plate 29 is bolted to the inside of the conical shell 6. A load cell 20 is bolted to the top center of the support plate 29. The load cell 20 is preferably a Kistler 601CAA model. The load cell 20 detects pressure change data in real time and transmits it to a control transmission module 24 for processing and analysis via a wire. If the pressure is abnormal... The decrease indicates a leak; a guide rod 21 is slidably inserted inside the load cell 20, and a baffle 22 is integrally formed at the bottom end of the guide rod 21. The baffle 22 is in contact with the support plate 19. A sealing seat 23 is bolted to the top of the guide rod 21, and the sealing seat 23 is slidably inserted into the top of the conical shell 6. A piston seat 8 is threaded to the top of the sealing seat 23, and a mounting shell 9 is bolted to the top of the piston seat 8. Camera modules 11 are embedded on both sides of the inner wall of the mounting shell 9. The camera modules 11 are preferably downhole high-definition imaging modules, model SchlumbergerVisiTrak. TMTwo lighting lamps 10 are embedded on each of the two sides of the inner wall of the mounting housing 9. The preferred model of the lighting lamps 10 is OceanLED Epsilon 12V LED cold light source. The lighting lamps 10 illuminate the wellbore environment. The camera module 11 captures images of the inner wall of the tubing and the joints. The image data is stored by the control transmission module 24 and uploaded to the ground system in real time through the connecting cable 13 to assist in locating the leak point. The control transmission module 24 is bolted inside the mounting housing 9. The control transmission module 24 is a central processing unit, model TIAM64x industrial-grade SoC. The control transmission module 24 sends a command to the pump body control module 17 to start the pump body 16. The pump body 16 injects gas into the rubber air bag 7 through the pipeline, causing it to expand in the limiting cavity 5, forming a mechanical lock and high-pressure seal, and tightly fixing the leak detection rod assembly 2 to the leak detection seat 3. The control transmission module 24 is connected to the weighing sensor through the wire. The device 20 is electrically connected. A connection terminal 25 is bolted to the top of the inner wall of the mounting housing 9 and is electrically connected to the control transmission module 24. A connection cable 13 is electrically connected to the top of the control transmission module 24. The connection terminal 25 ensures that the signal transmission between the connection cable 13 and the control transmission module 24 is unobstructed. A solenoid valve 26 is embedded in the outer wall of one side of the bottom of the piston seat 8. The preferred model of the solenoid valve 26 is ASCO8262G series. The solenoid valve 26 adjusts the opening and closing of the fluid channel between the upper and lower parts of the piston seat 8 according to the command of the control transmission module 24 to help maintain the sealing pressure balance. After the leak test is completed, the control transmission module 24 triggers the solenoid valve 26 to open and release pressure. The liquid above the piston seat 8 flows into the lower part of the piston seat 8. Under the buoyancy of the liquid, the leak test rod assembly 2 will rise. The solenoid valve 26 is electrically connected to the control transmission module 24 through a wire.

[0034] Example 2

[0035] This embodiment further defines the features of Embodiment 1. Specifically, the top of the mounting shell 9 has four integrally formed mounting plates 12, and each of the four mounting plates 12 has a connecting rope 14 bolted to one side of its top. One end of each connecting rope 14 is attached to a connecting cable 13. Inside the conical shell 6, a support plate 15 is bolted to the interior, and a pump control module 17 is bolted to the bottom of the support plate 15. The pump control module 17 is preferably an embedded PID controller, model National Instruments CRIO-9045, and the control transmission module 24 transmits data to… The pump control module 17 sends a command to start the pump 16. The pump 16 injects gas into the rubber airbag 7 through a pipeline, causing it to expand within the limiting cavity 5, forming a mechanical lock and high-pressure seal, thus tightly fixing the leak detection rod assembly 2 to the leak detection seat 3. The pump control module 17 is electrically connected to the control transmission module 24 via wires. A battery module 18 is bolted to the outer wall of one side of the top of the support plate 15. The battery module 18 is preferably a lithium thionyl chloride battery, model Tadiran SL-2780. The battery module 18 serves as the control transmission module 24, the weighing sensor 20, and the pump control module 17. The camera module 11 is powered by the battery module 18, which is electrically connected to the control transmission module 24, the weighing sensor 20, and the pump control module 17 via wires. A rubber air bladder 7 is bolted to the bottom of the conical shell 6, and a pump body 16 is bolted to the bottom of the inner wall of the conical shell 6. The pump body 16 is preferably a micro gear pump with an oil-resistant design, model Haskel AGD-1. The control transmission module 24 issues a command, and the pump control module 17 starts the pump body 16. The pump body 16 fills the rubber air bladder 7 with fluid through a pipe; the pump body 16 is interconnected with the rubber air bladder 7 through a pipe. Body 16 is electrically connected to pump body control module 17 via wires; Leak detection seat assembly 1 includes leak detection seat 3, with a cavity 4 at the top of leak detection seat 3, and conical shell 6 is precisely inserted into the cavity 4 at the top of leak detection seat 3, with cavity 4 providing initial guidance; conical shell 6 is inserted into the cavity 4, and a limiting cavity 5 is opened at the center of the bottom end of leak detection seat 3, with rubber airbag 7 expanding in a controlled manner within the limiting cavity 5, forming a mechanical lock with the inner wall of the limiting cavity 5, while simultaneously pushing conical shell 6 upward to press against the top of cavity 4, achieving high-pressure sealing; and the limiting cavity 5 and cavity 4 are interconnected, with rubber airbag 7 snapped into the inside of the limiting cavity 5.

[0036] Working principle: The leak detection rod assembly 2 is lowered to the predetermined position downhole via the connecting cable 13. The leak detection seat assembly 1 is pre-fixed to the inner wall of the tubing. The conical shell 6 is precisely inserted into the cavity 4 at the top of the leak detection seat 3. The cavity 4 provides initial guidance. The rubber airbag 7 at the bottom of the conical shell 6 then enters the limiting cavity 5 at the bottom of the leak detection seat 3. The control transmission module 24 issues a command, and the pump control module 17 starts the pump 16. The pump 16 fills the rubber airbag 7 with fluid through the pipeline. The battery module 18 provides stable power. The rubber airbag 7 expands in a controlled manner within the limiting cavity 5. The inner wall of the limiting cavity 5 forms a mechanical lock, while simultaneously pushing the conical shell 6 upward to press against the top of the cavity 4, achieving a high-pressure seal. The sealing seat 23 is subjected to the upward force of the conical shell 6, which is transmitted to the baffle 22 through the guide rod 21. The baffle 22 presses against the load cell 20 on the support plate 19. High-pressure fluid is injected into the oil pipe for a sealing test. The fluid pressure acts on the sealing seat 23 and is further transmitted to the load cell 20 through the guide rod 21 and the baffle 22. The load cell 20 monitors the pressure change of the sealing seat 23 in real time, and the data is transmitted to the control system via wires. If a sudden pressure drop indicates a leak, the control and transmission module 24 records and analyzes the data. Simultaneously, as the leak detection rod assembly 2 moves down inside the tubing, the lighting 10 inside the mounting housing 9 illuminates the wellbore environment. The camera module 11 captures real-time images of the tubing's inner wall and sealing condition. These images are synchronously transmitted to the control and transmission module 24. The control and transmission module 24 integrates the sensor data and image information, uploading it to the surface system via the connecting cable 13 for remote monitoring and real-time diagnosis. After leak detection, the control and transmission module 24 triggers the solenoid valve 26 to open and release pressure, and the piston... Liquid above seat 8 flows into the area below piston seat 8. At the same time, pump control module 17 drives pump body 16 to draw back the fluid in rubber airbag 7. Rubber airbag 7 contracts and is released from the locking constraint of limiting cavity 5. Leak detection rod assembly 2 is released from leak detection seat assembly 1. Subsequently, under the buoyancy of the liquid, leak detection rod assembly 2 will rise. In case of jamming, the leak detection rod assembly 2 can be lifted and retrieved from the ground via connecting cable 13. The four mounting plates 12 at the top of mounting shell 9 disperse the traction of connecting cable 13 via connecting rope 14 to avoid entanglement or breakage underground.

[0037] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A downhole tubing returnable leak detection device, comprising a leak detection seat assembly (1) and a leak detection rod assembly (2), characterized in that, The leak detection seat assembly (1) is installed together with the downhole tubing. The leak detection rod assembly (2) is inserted into the leak detection seat assembly (1). The leak detection rod assembly (2) includes a conical shell (6). A support plate (19) is installed inside the conical shell (6) by bolts. A weighing sensor (20) is installed at the top center of the support plate (19) by bolts. A guide rod (21) is slidably inserted inside the weighing sensor (20). A baffle (22) is integrally formed at the bottom end of the guide rod (21). The baffle (22) is in contact with the support plate (19). A sealing seat (23) is installed at the top end of the guide rod (21) by bolts. The sealing seat (23) is slidably inserted at the top end of the conical shell (6). A piston seat (8) is threadedly connected to the top end of the sealing seat (23). A mounting shell (9) is bolted to the top of the piston seat (8). Camera modules (11) are embedded on both sides of the inner wall of the mounting shell (9). Two lighting lamps (10) are embedded on each of the other two sides of the inner wall of the mounting shell (9). A control transmission module (24) is bolted to the inside of the mounting shell (9). The control transmission module (24) is electrically connected to the weighing sensor (20) via a wire. A connection terminal (25) is bolted to the top of the inner wall of the mounting shell (9). The connection terminal (25) is electrically connected to the control transmission module (24). A connection cable (13) is electrically connected to the top of the control transmission module (24). A solenoid valve (26) is embedded on the outer wall of one side of the bottom of the piston seat (8). The solenoid valve (26) is electrically connected to the control transmission module (24) via a wire.

2. The downhole tubing returnable leak detection device according to claim 1, characterized in that, The top of the mounting shell (9) is integrally formed with four mounting plates (12), and each of the four mounting plates (12) has a connecting rope (14) installed on one side of its top by bolts. One end of the four connecting ropes (14) is installed on the connecting cable (13).

3. The downhole tubing returnable leak detection device according to claim 1, characterized in that, Inside the conical shell (6), a support plate (15) is installed by bolts, and a pump body control module (17) is installed on one side of the bottom of the support plate (15) by bolts. The pump body control module (17) is electrically connected to the control transmission module (24) by wires.

4. A downhole tubing returnable leak detection device according to claim 3, characterized in that, A battery module (18) is bolted to the outer wall of the top side of the support plate (15), and the battery module (18) is electrically connected to the control transmission module (24), the weighing sensor (20), and the pump control module (17) through wires.

5. A downhole tubing returnable leak detection device according to claim 3, characterized in that, A rubber airbag (7) is bolted to the bottom of the conical shell (6), and a pump body (16) is bolted to the bottom of the inner wall of the conical shell (6). The pump body (16) is connected to the rubber airbag (7) through a pipe, and the pump body (16) is electrically connected to the pump control module (17) through a wire.

6. A downhole tubing returnable leak detection device according to claim 5, characterized in that, The leak detection seat assembly (1) includes a leak detection seat (3), the top of which has a cavity (4), and the conical shell (6) is inserted into the cavity (4).

7. A downhole tubing returnable leak detection device according to claim 6, characterized in that, The leak detection seat (3) has a limiting cavity (5) at the center of its bottom end, and the limiting cavity (5) is interconnected with the cavity (4). The rubber airbag (7) is snapped into the limiting cavity (5).

Images