Rapid detection device and method for oil and gas well pipe column sealing thread damage injection agent repair

Abstract

The invention relates to the technical field of oil and gas field development and production, and discloses a rapid detection device and method for oil and gas well tubular column sealing thread damage injection agent repair, and the device comprises a pressurization mechanism, a pressure container and a thread damage assembly; the pressurizing mechanism comprises a liquid supply assembly, a manual hydraulic pump and a pipeline assembly, the liquid supply assembly is installed on the manual hydraulic pump, and the pipeline assembly is installed at the output end of the manual hydraulic pump; the pressure container comprises a sealed container and a piston, the piston is slidably connected to the inner side wall of the sealed container, and the bottom of the sealed container communicates with the pipeline assembly; the thread damage assembly comprises a conduit assembly, a pressure gauge and an external plug; the conduit assembly is communicated with the top of the sealed container; the external plug is in threaded connection with the end, away from the sealed container, of the guide pipe assembly. According to the invention, two states of thread slippage and damage leakage can be simulated, and downhole conduit thread leakage simulation and rapid detection of chemical injection agent repair are realized.

Description

Technical Field

[0001] This invention relates to the field of oil and gas field development and production technology, and in particular to a rapid detection device and method for repairing damage to the sealing threads of oil and gas well tubing using injection. Background Technology

[0002] During oil and gas field development and production, underground tubing is subjected to adverse factors such as long-term hydraulic pressure, alternating loads, tool friction, and harsh environments. This inevitably leads to problems such as loosening, damage, and wear of the threaded seals, resulting in tubing barrier damage and downhole leakage accidents. For oil and gas fields in the mid-to-late stages of development, tubing damage is mainly concentrated on defects in the sealing threads. Annular pressure caused by thread leakage has always been a significant issue affecting oil and gas production, posing a huge risk to safe production and environmental protection.

[0003] Rapid chemical injection repair of damaged sealing threads is an effective way to restore tubing integrity and eliminate leaks. However, the selection of chemical injection type, implementation process, and repair effect are closely related to the leakage level of the wellbore components, requiring a combination of thread damage simulation and injection repair test results. However, as Chinese oilfields gradually enter the mid-to-late stage of development and shale gas well development expands, leakage problems caused by damaged sealing threads are becoming increasingly prominent. Existing formation leakage assessment devices have shown shortcomings in simulating tubing thread damage leakage and rapidly screening chemical injections. Specifically, to enhance the simulation of downhole formation, tubing leakage, and harsh environments, the leakage detection and assessment devices are designed to be complex and bulky, resulting in complex operation, poor portability, and hindering the rapid implementation of chemical injection thread damage repair simulation and field testing.

[0004] To address this, a rapid detection device and method for repairing damaged sealing threads in oil and gas well tubing are proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a rapid detection device and method for repairing damaged sealing threads of oil and gas well tubing with injection agent, aiming to solve or improve at least one of the above-mentioned technical problems.

[0006] To achieve the above objectives, the present invention provides the following solution: The present invention provides a rapid detection device for repairing damage to the sealing threads of oil and gas well tubing using injection molding, comprising:

[0007] A pressurizing mechanism, comprising a liquid supply assembly, a manual hydraulic pump, and a pipeline assembly, wherein the liquid supply assembly is mounted on the manual hydraulic pump, and the pipeline assembly is mounted on the output end of the manual hydraulic pump;

[0008] A pressure vessel, comprising a sealed container and a piston, the piston being slidably connected to the inner wall of the sealed container, the bottom of the sealed container being in communication with the pipeline assembly;

[0009] A thread damage assembly, comprising a conduit assembly, a pressure gauge, and an external thread plug, wherein the conduit assembly is in communication with the top of the sealed container; the pressure gauge is mounted on the conduit assembly, and the external thread plug is threadedly connected to the end of the conduit assembly away from the sealed container.

[0010] According to the present invention, a rapid detection device for repairing damaged sealing threads of oil and gas well tubing is provided, wherein the tubing assembly comprises:

[0011] The catheter body has one end fixedly connected to and in communication with the top of the sealed container; the catheter body is fixedly connected to the sealed container via a connecting assembly.

[0012] A three-way connector is installed at the end of the conduit body away from the sealed container. One end of the three-way connector is connected to the pressure gauge via a pressure gauge connector, and the other end is equipped with a ball valve.

[0013] A connector, one end of which is connected to the ball valve, and the other end of which is threaded to the external thread plug.

[0014] According to the present invention, a rapid detection device for repairing damage to the sealing threads of an oil and gas well tubing is provided. The connecting assembly includes a pipe clamp and a fixing ring. The fixing ring is detachably connected to the outer wall of the sealing container, and the pipe clamp is detachably connected to the pipe body. A base plate is installed on the outer wall of the fixing ring, and the pipe clamp is fixedly installed on the base plate.

[0015] According to the present invention, a rapid detection device for repairing the sealing thread damage of oil and gas well tubing is provided. The sealing container includes a container body, a sealing top cover is detachably connected to the top of the container body, a sealing bottom cover is detachably connected to the bottom of the container body, and a piston is slidably connected to the inner wall of the container body.

[0016] The lower sealing cover is fixedly connected to the pipeline assembly, the conduit body is fixedly connected to the upper sealing cover, and both the pipeline assembly and the conduit body are in communication with the inner cavity of the container body; the fixing ring is detachably connected to the outer wall of the container body.

[0017] According to the present invention, a rapid detection device for repairing damage to the sealing threads of oil and gas well tubing is provided. The pipeline assembly includes a hydraulic pipeline, on which a shut-off valve is installed. One end of the hydraulic pipeline is connected to the output end of the manual hydraulic pump, and the other end is connected to the sealing cap through a plug with holes.

[0018] According to the present invention, a rapid detection device for injecting and repairing damaged sealing threads of oil and gas well tubing is provided. The fluid supply assembly includes a quartz cup and a needle valve. The bottom of the needle valve is connected to the manual hydraulic pump, and the top is connected to the quartz cup.

[0019] According to the present invention, a rapid detection device for repairing damage to the sealing threads of oil and gas well tubing using injection is provided, wherein the hydraulic pipeline is made of metal.

[0020] According to the present invention, a rapid detection device for repairing damage to the sealing threads of oil and gas well tubing using injection is provided, wherein the manual hydraulic pump is driven by a handle.

[0021] According to the present invention, a rapid detection device for repairing damage to the sealing threads of oil and gas well tubing is provided, wherein the outer diameter of the container body is 70mm to 90mm, the height of the container body is 300mm to 400mm, and the outer diameter of the fixing ring is 100mm to 120mm.

[0022] This invention also provides a rapid detection method for repairing damaged sealing threads of oil and gas well tubing using injection, comprising the following steps:

[0023] Step 1: Preparation of the pressurization mechanism: Connect the manual hydraulic pump and the sealed container using the pipeline assembly, close the pipeline assembly, and adjust the manual hydraulic pump to retract the screw inside the manual hydraulic pump; use the fluid supply assembly to inject hydraulic oil into the manual hydraulic pump to retract the screw to the set position.

[0024] Step 2, pressurized injection operation: Inject clean water into the sealed container, with the water positioned above the piston. Close the conduit assembly and the liquid supply assembly, open the pipeline assembly, and adjust the manual hydraulic pump to advance. The hydraulic oil in the manual hydraulic pump is squeezed into the sealed container. Stop when the pressure gauge reading reaches the set value.

[0025] Step 3: Detection of loose threads and thread damage / leakage:

[0026] First, install the external threaded plug, open the conduit assembly, and pressure test it with clean water in the sealed container. When the pressure gauge reaches a stable pressure value, the conduit assembly is considered to be well sealed.

[0027] Then, thread loosening detection and thread damage / leakage detection are performed separately:

[0028] When performing thread loosening test, close the conduit assembly, rotate the external thread plug to partially connect the conduit assembly and the external thread plug, simulating thread stripping and loosening; finally, open the conduit assembly, and under the pressure of the conduit, clean water in the sealed container sprays and leaks along the stripped thread hole of the external thread plug until the pressure drops to zero, and observe the thread loosening and leakage of the external thread plug.

[0029] When performing thread damage leakage detection, replace the external thread plug with a thread-damaged external thread plug to simulate thread damage leakage; close the conduit assembly and readjust the pressure of the conduit assembly to the set value; open the conduit assembly and spray clean water in the sealed container along the thread damage path of the external thread plug until the pressure drops to zero, and observe the thread damage leakage situation.

[0030] Step 4: Chemical injection repair and testing for thread leaks:

[0031] Replace the water in the sealed container with the liquid sealant to be tested;

[0032] Close the catheter assembly and adjust the sealing container to bring the pressure of the catheter assembly to the set value;

[0033] Open the conduit assembly; the liquid sealant to be tested is sprayed and leaks along the thread damage path of the external thread plug under the pressure of the conduit assembly until the spraying stops.

[0034] If increasing the pressure of the conduit assembly does not result in a recurrence of leakage, and the pressure gauge maintains a stable pressure value, the leakage caused by the current thread damage is considered sealed, and the chemical injection sealing is considered successful. If the pressure value continues to drop to zero, the chemical injection repair of the thread damage is considered a failure.

[0035] Step 5: Equipment cleaning and maintenance: Loosen the external thread plug for the leak test, release the pressure of the conduit assembly, disassemble the sealing container, and clean the thread-damaged components and sealing container.

[0036] The present invention discloses the following technical effects:

[0037] This invention can simulate leakage caused by thread damage and loosening. It uses a manual hydraulic pump to pressurize the fluid in the pressure vessel and detects thread leakage under leakage pressure differential. If the fluid is replaced with a chemical sealant, it is injected through constant leakage pressure differential, and the flow rate of the chemical sealant at the thread leakage point is monitored in real time until the sealing behavior occurs.

[0038] This invention addresses the common problem of tubing thread leakage during the mid-to-late stage development of oil and gas fields and gas well development. It simplifies existing formation and tubing leakage simulation and evaluation devices, and can simulate two states: thread slippage and damage leakage. It adopts a simpler manual hydraulic pump and combines it with a pressure vessel for pressurization and storage, to achieve rapid detection of downhole tubing thread leakage simulation and chemical injection repair. It obtains the dynamic process and qualitative effect of chemical injection sealing of thread leakage, and provides a scientific basis for the field screening of chemical injections for thread damage repair. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments 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 drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the structure of the present invention;

[0041] Figure 2 This is a schematic diagram of the pressure vessel and thread damage assembly in this invention;

[0042] Figure 3 This is a schematic diagram of the tightened state of the external thread plug in this invention;

[0043] Figure 4 This is a schematic diagram of the loosened state of the external thread plug in this invention;

[0044] Figure 5 This is a schematic diagram of the thread damage state of the external thread plug in this invention.

[0045] The components are as follows: 1. Fixing ring; 2. Base plate; 3. Pressure gauge connector; 4. Connector; 5. Sealing cover; 6. Pipe clamp; 7. Ball valve; 8. Threaded plug; 9. Tee connector; 10. Conduit body; 11. Manual hydraulic pump; 12. Container body; 13. Shut-off valve; 14. Quartz cup; 15. Needle valve. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0048] Reference Figures 1-5 This invention provides a rapid detection device for repairing damaged sealing threads of oil and gas well tubing using injection, comprising:

[0049] The pressurization mechanism includes a liquid supply component, a manual hydraulic pump 11, and a pipeline assembly. The liquid supply component is mounted on the manual hydraulic pump 11, and the pipeline assembly is mounted on the output end of the manual hydraulic pump 11.

[0050] A pressure vessel includes a sealed container and a piston, the piston being slidably connected to the inner wall of the sealed container, and the bottom of the sealed container being connected to a pipeline assembly.

[0051] The thread damage assembly includes a conduit assembly, a pressure gauge, and an external threaded plug 8. The conduit assembly is connected to the top of the sealed container. The pressure gauge is mounted on the conduit assembly, and the external threaded plug 8 is threadedly connected to the end of the conduit assembly away from the sealed container. The external threaded plug 8 has a wedge-shaped groove with a width of 1.21 mm and a depth of 1.52 mm when simulating thread damage.

[0052] With this configuration, the present invention can simulate leakage caused by thread damage and loosening. The fluid in the pressure vessel is driven by the pressurization method of the manual hydraulic pump 11, and the thread leakage is detected under the leakage pressure difference. If the fluid is replaced with chemical sealant, it is injected by constant leakage pressure difference, and the flow rate change of chemical sealant at the thread leakage point is monitored in real time until the sealing behavior is achieved.

[0053] This invention addresses the common problem of tubing thread leakage during the mid-to-late stage development of oil and gas fields and gas well development. It simplifies existing formation and tubing leakage simulation and evaluation devices, and can simulate two states: thread slippage and damage leakage. It adopts a simpler manual hydraulic pump and combines it with a pressure vessel for pressurization and storage, to achieve rapid detection of downhole tubing thread leakage simulation and chemical injection repair. It obtains the dynamic process and qualitative effect of chemical injection sealing of thread leakage, and provides a scientific basis for the field screening of chemical injections for thread damage repair.

[0054] Further optimization of the design includes the following catheter components:

[0055] The catheter body 10 has one end fixedly connected to and in communication with the top of the sealed container; the catheter body 10 is fixedly connected to the sealed container via a connecting assembly.

[0056] The tee connector 9 is installed at the end of the conduit body 10 away from the sealed container. One end of the tee connector 9 is connected to the pressure gauge through the pressure gauge connector 3, and the other end is equipped with a ball valve 7.

[0057] Connector 4, one end of connector 4 is connected to ball valve 7, and the other end is threaded to external thread plug 8;

[0058] Under pressure, the fluid (water or liquid sealant) inside the sealed container flows through the top of the container into the conduit body 10 towards the end away from the sealed container. A tee connector 9 facilitates fluid diversion and connection to multiple components. One end of the tee connector 9 connects to a pressure gauge via a pressure gauge connector 3, allowing real-time transmission of fluid pressure to the gauge for accurate pressure readings by maintenance personnel. A ball valve 7 at the other end controls the flow path. Before testing, the ball valve 7 is closed to allow the sealed container to be pressurized to the set value. During testing, the ball valve 7 is opened, allowing fluid to flow to the connector 4. The connector 4 provides a stable mounting base for the external threaded plug 8 and ensures that fluid leaks only along the mating gap (or damage path) between the connector 4 and the external threaded plug 8, preventing leakage from the conduit assembly itself from affecting the test results and enabling accurate simulation of thread leakage and injection repair testing.

[0059] The scheme is further optimized. The connection components include a pipe clamp 6 and a fixing ring 1. The fixing ring 1 is detachably connected to the outer wall of the sealed container, and the pipe clamp 6 is detachably connected to the pipe body. A base plate 2 is installed on the outer wall of the fixing ring 1, and the pipe clamp 6 is fixedly installed on the base plate 2.

[0060] The retaining ring 1 is detachably fitted onto the outer wall of the sealed container via a bolt connection. Its installation position can be adjusted according to the size of the sealed container to accommodate different specifications. The base plate 2 on the outer wall of the retaining ring 1 provides an installation platform for the pipe clamp 6. The pipe clamp 6 is detachably connected to the conduit body 10 via bolts or other means. The pipe clamp 6 is then fixedly installed on the base plate 2, forming a stable connection between the conduit body 10 and the retaining ring 1 through the pipe clamp 6, the base plate 2, and the retaining ring 1. During testing, the fluid pressure inside the sealed container will exert an impact force on the conduit body 10. The connecting components, through the rigid connection between the retaining ring 1 and the sealed container, and the clamping action of the pipe clamp 6 on the conduit body 10, can counteract this impact force, preventing displacement of the conduit body 10 or loosening of the connection with the sealed container. This ensures stable fluid conduction within the conduit body 10, avoids pressure fluctuations or leaks caused by conduit movement, and guarantees testing accuracy.

[0061] Further optimization of the scheme: the sealed container includes a container body 12, a sealing upper cover 5 is detachably connected to the top of the container body 12, a sealing lower cover is detachably connected to the bottom of the container body 12, and a piston is slidably connected to the inner wall of the container body 12.

[0062] The lower sealing cover is fixedly connected to the pipeline assembly, the conduit body 10 is fixedly connected to the upper sealing cover 5, and both the pipeline assembly and the conduit body 10 are connected to the inner cavity of the container body 12; the fixing ring 1 is detachably connected to the outer wall of the container body 12.

[0063] The container body 12 provides a cavity for fluid storage. A piston is slidably connected to the inner wall of the container body 12 and can move up and down with changes in the hydraulic oil pressure at the bottom, squeezing the fluid (clean water or sealant) at the top to form the test pressure. The sealing upper cover 5 at the top of the container body 12 and the sealing lower cover at the bottom are both detachably connected (such as by flange connection) to facilitate cleaning and component replacement before and after testing: Before testing, opening the sealing upper cover 5 allows fluid to be injected into the container body 12, and opening the sealing lower cover facilitates maintenance of the connection between the bottom of the container and the pipeline assembly; During testing, the sealing upper cover 5 and the sealing lower cover ensure the sealing of the inner cavity of the container body 12 through a sealing element (such as a sealing ring) to prevent fluid leakage.

[0064] The scheme is further optimized. The pipeline assembly includes a hydraulic pipeline, on which a shut-off valve 13 is installed. One end of the hydraulic pipeline is connected to the output end of the manual hydraulic pump 11, and the other end is connected to the sealing lower cover through a plug with holes.

[0065] The shut-off valve 13 installed on the hydraulic pipeline can control the opening and closing of the passage: before pressurization, the shut-off valve 13 is closed so that the manual hydraulic pump 11 can inject hydraulic oil through the fluid supply component, and prevent the hydraulic oil from flowing into the sealed container in advance; when pressurizing, the shut-off valve 13 is opened so that the high-pressure hydraulic oil generated by the manual hydraulic pump 11 can be delivered to the bottom of the sealed container along the hydraulic pipeline, pushing the piston upward to squeeze the fluid.

[0066] The solution is further optimized. The fluid supply assembly includes a quartz cup 14 and a needle valve 15. The bottom of the needle valve 15 is connected to the manual hydraulic pump 11, and the top is connected to the quartz cup 14. The quartz cup 14 serves as a hydraulic oil storage container, and its transparent material allows maintenance personnel to easily observe the remaining oil level and replenish it in a timely manner. The bottom of the quartz cup 14 is connected to the top of the needle valve 15, and the bottom of the needle valve 15 is connected to the manual hydraulic pump 11, forming a hydraulic oil supply path. When hydraulic oil needs to be injected into the manual hydraulic pump 11, the needle valve 15 is opened, and the hydraulic oil in the quartz cup 14 flows into the manual hydraulic pump 11 under the action of gravity. During the injection process, the flow rate of the oil can be controlled by adjusting the opening of the needle valve 15 to avoid the oil flowing in too quickly, which would cause air bubbles to form in the manual hydraulic pump 11 and affect the stability of the pressure output. When the hydraulic oil in the manual hydraulic pump 11 reaches the set amount (the screw retracts to the set position), the needle valve 15 is closed to stop the fluid supply, ensuring that the manual hydraulic pump 11 stores enough hydraulic oil to provide power for subsequent pressurization.

[0067] The design was further optimized, and the hydraulic lines were made of metal.

[0068] The design was further optimized so that the manual hydraulic pump 11 is driven by a handle.

[0069] In a further optimized design, the outer diameter of the container body 12 is 70mm to 90mm, preferably 78mm in this embodiment; the height of the container body 12 is 300mm to 400mm, preferably 340mm in this embodiment; and the outer diameter of the fixing ring 1 is 100mm to 120mm, preferably 108mm in this embodiment.

[0070] This invention also provides a rapid detection method for repairing damaged sealing threads of oil and gas well tubing using injection, comprising the following steps:

[0071] Step 1: Preparation of the pressurization mechanism: Connect the manual hydraulic pump 11 and the sealed container using the pipeline assembly, close the pipeline assembly, and adjust the manual hydraulic pump 11 to retract the screw inside the manual hydraulic pump 11; inject hydraulic oil into the manual hydraulic pump 11 using the fluid supply assembly to retract the screw to the set position; if all the hydraulic oil in the fluid supply assembly enters the manual hydraulic pump 11 during the retraction process, then replenish the hydraulic oil in the fluid supply assembly.

[0072] Step 2, pressurized injection operation: Inject clean water into the sealed container, with the clean water positioned above the piston. Close the conduit assembly and the liquid supply assembly, open the pipeline assembly, and adjust the manual hydraulic pump 11 to advance. The hydraulic oil in the manual hydraulic pump 11 is squeezed into the sealed container. Stop when the pressure gauge reading reaches the set value.

[0073] Step 3: Detection of loose threads and thread damage / leakage:

[0074] First, install the external threaded plug 8, open the conduit assembly, and pressure test it with clean water in the sealed container. When the pressure gauge is at a stable pressure value, it is determined that the current conduit assembly is well sealed.

[0075] Then, thread loosening detection and thread damage / leakage detection are performed separately:

[0076] When performing thread loosening test, close the conduit assembly, rotate the external thread plug 8 to partially connect the conduit assembly and the external thread plug 8 with threads to simulate thread stripping and loosening; finally, open the conduit assembly, and under the pressure of the conduit, clean water in the sealed container sprays and leaks along the stripped thread hole of the external thread plug 8 until the pressure value drops to zero, and observe the thread loosening and leakage of the external thread plug 8.

[0077] When performing thread damage leakage detection, replace the external thread plug 8 with the thread-damaged external thread plug 8 to simulate thread damage leakage; close the conduit assembly and readjust the pressure of the conduit assembly to the set value; open the conduit assembly and spray clean water in the sealed container along the thread damage path of the external thread plug 8 until the pressure drops to zero, and observe the thread damage leakage situation.

[0078] Step 4: Chemical injection repair and testing for thread leaks:

[0079] Replace the water in the sealed container with the liquid sealant to be tested;

[0080] Close the catheter assembly and adjust the sealing container to bring the pressure of the catheter assembly to the set value;

[0081] Open the conduit assembly, and the liquid sealant to be tested will be sprayed and leak along the thread damage path of the external thread plug 8 under the pressure of the conduit assembly until the spraying stops;

[0082] If increasing the pressure of the conduit assembly does not result in a recurrence of leakage, and the pressure gauge maintains a stable pressure value, the leakage caused by the current thread damage is considered sealed, and the chemical injection sealing is considered successful. If the pressure value continues to drop to zero, the chemical injection repair of the thread damage is considered a failure.

[0083] Step 5, Equipment Cleaning and Maintenance: Loosen the external thread plug 8 for leakage testing, release the pressure of the conduit assembly, disassemble the sealing container, and clean the thread-damaged components and sealing container.

[0084] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0085] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A rapid detection device for repairing damaged sealing threads of oil and gas well tubing using injection molding, characterized in that, include: The pressurization mechanism includes a liquid supply assembly, a manual hydraulic pump (11), and a pipeline assembly. The liquid supply assembly is mounted on the manual hydraulic pump (11), and the pipeline assembly is mounted on the output end of the manual hydraulic pump (11). A pressure vessel, comprising a sealed container and a piston, the piston being slidably connected to the inner wall of the sealed container, the bottom of the sealed container being in communication with the pipeline assembly; A thread damage assembly, comprising a conduit assembly, a pressure gauge, and an external thread plug (8), wherein the conduit assembly is in communication with the top of the sealed container; the pressure gauge is mounted on the conduit assembly, and the external thread plug (8) is threadedly connected to the end of the conduit assembly away from the sealed container.

2. The rapid detection device for repairing damaged sealing threads of oil and gas well tubing according to claim 1, characterized in that: The catheter assembly includes: The catheter body (10) has one end fixedly connected to and in communication with the top of the sealed container; the catheter body (10) is fixedly connected to the sealed container via a connecting assembly. A three-way connector (9) is installed at the end of the conduit body (10) away from the sealed container. One end of the three-way connector (9) is connected to the pressure gauge via a pressure gauge connector (3), and the other end is equipped with a ball valve (7). Connector (4), one end of which is connected to the ball valve (7), and the other end is threaded to the external thread plug (8).

3. The rapid detection device for repairing damaged sealing threads of oil and gas well tubing according to claim 2, characterized in that: The connecting assembly includes a pipe clamp (6) and a fixing ring (1). The fixing ring (1) is detachably connected to the outer wall of the sealed container. The pipe clamp (6) is detachably connected to the pipe body. A base plate (2) is installed on the outer wall of the fixing ring (1). The pipe clamp (6) is fixedly installed on the base plate (2).

4. The rapid detection device for repairing damaged sealing threads of oil and gas well tubing according to claim 3, characterized in that: The sealed container includes a container body (12), a sealing top cover (5) is detachably connected to the top of the container body (12), a sealing bottom cover is detachably connected to the bottom of the container body (12), and the piston is slidably connected to the inner wall of the container body (12). The lower sealing cover is fixedly connected to the pipeline assembly, the conduit body (10) is fixedly connected to the upper sealing cover (5), and both the pipeline assembly and the conduit body (10) are in communication with the inner cavity of the container body (12); the fixing ring (1) is detachably connected to the outer wall of the container body (12).

5. The rapid detection device for repairing damaged sealing threads of oil and gas well tubing according to claim 1, characterized in that: The pipeline assembly includes a hydraulic pipeline with a shut-off valve (13) installed on it. One end of the hydraulic pipeline is connected to the output end of the manual hydraulic pump (11), and the other end is connected to the sealing lower cover through a plug with holes.

6. The rapid detection device for repairing damaged sealing threads of oil and gas well tubing according to claim 1, characterized in that: The liquid supply assembly includes a quartz cup (14) and a needle valve (15). The bottom of the needle valve (15) is connected to the manual hydraulic pump (11), and the top is connected to the quartz cup (14).

7. The rapid detection device for repairing damaged sealing threads of oil and gas well tubing according to claim 5, characterized in that: The hydraulic lines are made of metal.

8. The rapid detection device for repairing damaged sealing threads of oil and gas well tubing according to claim 1, characterized in that: The manual hydraulic pump (11) is driven by a handle.

9. The rapid detection device for repairing damaged sealing threads of oil and gas well tubing according to claim 5, characterized in that: The outer diameter of the container body (12) is 70mm to 90mm, and the height of the container body (12) is 300mm to 400mm; the outer diameter of the fixing ring (1) is 100mm to 120mm.

10. A rapid detection method for repairing damaged sealing threads of oil and gas well tubing using injection molding, based on the rapid detection device for repairing damaged sealing threads of oil and gas well tubing as described in any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Preparation of pressurization mechanism: Connect the manual hydraulic pump (11) and the sealed container using the pipeline assembly, close the pipeline assembly, adjust the manual hydraulic pump (11) to retract the screw inside the manual hydraulic pump (11); inject hydraulic oil into the manual hydraulic pump (11) using the fluid supply assembly to retract the screw to the set position. Step 2, pressurized squeezing operation: inject clean water into the sealed container, with the clean water above the piston, close the conduit assembly and the liquid supply assembly, open the pipeline assembly, adjust the manual hydraulic pump (11) to advance, and the hydraulic oil in the manual hydraulic pump (11) is squeezed into the sealed container. Stop when the pressure gauge reading reaches the set value. Step 3: Detection of loose threads and thread damage / leakage: First, install the external thread plug (8), open the conduit assembly, and use the clean water in the sealed container to test the pressure. When the pressure gauge is at a stable pressure value, it is determined that the current conduit assembly is well sealed. Then, thread loosening detection and thread damage / leakage detection are performed separately: When performing thread loosening test, close the conduit assembly, rotate the external thread plug (8) to make the conduit assembly partially threaded to the external thread plug (8) to simulate thread slippage and loosening; finally, open the conduit assembly, and under the action of conduit pressure, clean water in the sealed container sprays and leaks along the slippage hole of the external thread plug (8) until the pressure value drops to zero, and observe the thread loosening and leakage of the external thread plug (8); When performing thread damage leakage detection, the external thread plug (8) is replaced with a thread-damaged external thread plug (8) to simulate thread damage leakage; the conduit assembly is closed and the pressure of the conduit assembly is readjusted to the set value; the conduit assembly is opened and the clean water in the sealed container is sprayed along the thread damage path of the external thread plug (8) until the pressure drops to zero, and the thread damage leakage situation is observed. Step 4: Chemical injection repair and testing for thread leaks: Replace the water in the sealed container with the liquid sealant to be tested; Close the catheter assembly and adjust the sealing container to bring the pressure of the catheter assembly to the set value; Open the conduit assembly, and the liquid sealant to be tested will be sprayed and leaked along the thread damage path of the external thread plug (8) under the pressure of the conduit assembly until the spraying stops; If increasing the pressure of the conduit assembly does not result in a recurrence of leakage, and the pressure gauge maintains a stable pressure value, the leakage caused by the current thread damage is considered sealed, and the chemical injection sealing is considered successful. If the pressure value continues to drop to zero, the chemical injection repair of the thread damage is considered a failure. Step 5, Equipment cleaning and maintenance: Loosen the external thread plug (8) for leakage testing, release the pressure of the conduit assembly, disassemble the sealing container, and clean the thread-damaged components and sealing container.

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