A multi-gas combined production double-wellhead tubing hanger seal test equipment and method

Abstract

The application discloses a kind of multi-gas combined production double well mouth pipe hanger sealing test equipment and method, it is related to sealing detection equipment technical field, equipment includes detection tank body, booster unit and positioning detection unit, necking mouth is equipped in detection tank body middle part, pipe hanger is sealed contact with necking mouth.Positioning detection unit includes detection table, two same structures well mouth sealing part and drive part, drive part uses double tensioning sliding block cooperation chain and tensioning wheel structure, realize the synchronous symmetrical adjustment of two positioning columns, to adapt to the hanger of different through opening spacing.Sealing sleeve is opened out in inverted cone shape by the drive center linkage of electric push rod drive edge support assembly in positioning column, drive support opening paddle, to realize the two-way plugging of through opening in cooperation with the screw lifting of positioning column. Booster unit is inflated and pressurized to the upper part of tank body, and pressure sensor monitors the pressure change of detection table after hanger is pressed, quickly adapts hanger, and realizes efficient and accurate sealing detection.

Description

Technical Field

[0001] This invention relates to the field of sealing testing equipment technology, specifically a sealing performance testing device and method for a dual-wellhead tubing hanger used in multi-gas combined production. Background Technology

[0002] In multi-layered natural gas co-production operations, dual-wellhead tubing hangers are used to simultaneously suspend two tubings, with two independent ports connecting to different production layers to achieve multi-gas co-production. After the hanger is mounted at the wellhead, it relies on seals to isolate the pressure gaps between the ports; the sealing performance directly affects downhole safety and production efficiency.

[0003] Currently, the sealing performance testing of dual-wellhead tubing hangers often employs a post-assembly pressure testing method, where the hanger is installed in the actual wellhead environment before pressure verification. This method requires repeated disassembly and reassembly of the hanger and wellhead equipment during testing, resulting in a long operation cycle and high labor intensity, making it difficult to meet the needs of batch testing. Secondly, the center distance between the two ports of hangers of different specifications varies. Existing testing fixtures mostly use fixed positioning columns, which cannot be flexibly adjusted. Forcing a fit can easily lead to misalignment of the sealing pair, resulting in distorted test results. Under high pressure, the sealing component is prone to displacement or leakage, affecting the reliability of the test. Therefore, a dedicated testing device is needed that can flexibly adapt to different port spacings, achieve reliable bidirectional sealing, and provide real-time feedback on leakage status to improve the accuracy and efficiency of dual-wellhead hanger sealing performance testing. Summary of the Invention

[0004] The purpose of this invention is to provide a sealing test device and method for a dual-wellhead tubing hanger used in multi-gas combined production, in order to solve the problems raised in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a sealing performance testing device for a dual-wellhead tubing hanger used in multi-gas combined production, comprising a testing tank, a pressurizing unit, and a positioning testing unit. The testing tank has a necked-off section in its middle, with the tubing hanger in sealed contact with the necked-off section. The pressurizing unit is connected to the portion of the testing tank above the necked-off section, and the positioning testing unit is positioned below the necked-off section of the testing tank. Before starting the test, the operator first opens the sealing cover, then adjusts the distance between the two positioning columns according to the distance between the two openings of the tubing hanger to be tested, and then places the tubing hanger into the testing tank, with the seal on the tubing hanger contacting the necked-off section.

[0006] The positioning and testing unit includes a testing platform, a first wellhead sealing part, a second wellhead sealing part, and a drive unit. The first and second wellhead sealing parts have the same structure and are symmetrically mounted on the testing platform. The drive unit includes two symmetrically arranged tensioning sliders and a chain. The pair of tensioning sliders are slidably connected to the testing platform, and a tensioning wheel is installed at the bottom of each tensioning slider. The chain connects the pair of tensioning wheels and the first and second wellhead sealing parts. The control system controls the moving module to make the guide sliders move symmetrically on the testing platform simultaneously. The positioning column moves synchronously with the guide sliders. After the distance between the positioning column and the two openings of the tubing hanger is matched, the positioning column can enter the interior of the tubing hanger and block the two openings of the tubing hanger through the expanded sealing sleeve, thus isolating the space between the upper and lower parts of the testing tank. Then, the operator closes the sealing cover to prepare for the sealing test.

[0007] Furthermore, a sealing cover is rotatably installed on the top of the testing tank. The pressurization unit includes a booster pump and an air pipe. The booster pump is located on the outside of the testing tank. A connection hole is opened above the neck of the testing tank, and a one-way valve is installed in the connection hole. One end of the air pipe is connected to the inflation end of the booster pump, and the other end of the air pipe is connected to the connection hole. After the booster pump starts, air is injected into the upper part of the testing tank through the air pipe. The one-way valve ensures that gas can only enter and not exit. As the air pressure in the upper part of the testing tank increases, the gas pushes the oil pipe hanger downward. The oil pipe hanger transmits the pressure to the testing platform through the guide slider, and then applies pressure to the pressure sensor through the testing platform. When the gas pressure reaches the set value, the booster pump stops pumping.

[0008] Furthermore, several pressure sensors are installed between the testing platform and the testing tank. The first wellhead sealing part includes a guide slider and a driven sprocket. The guide slider is slidably connected to the testing platform. Each guide slider is equipped with a moving module, which is connected to the control system via a circuit. The middle of the guide slider is open from top to bottom, and a sealing ring is installed on the top of the guide slider. The driven sprocket is rotatably installed in the guide slider. The bottom of the tubing hanger contacts the sealing ring to enhance the leakage prevention effect. During the sliding adjustment of the guide sliders, the center distance between the two driven sprockets changes. When the chain begins to slack, the spring pulls the tension slider to move, and the two tensioning wheels tighten the chain. If the chain begins to tighten, the tension slider overcomes the spring tension, and the two tensioning wheels move closer to each other to compensate for the chain's tightening movement.

[0009] Furthermore, the first wellhead sealing part includes a positioning column, a screw hole is opened in the middle of the driven sprocket, a thread is opened on the outer contour of the positioning column, the thread is matched with the screw hole, a limit protrusion is provided at the bottom of the guide slider, and a limit groove is opened at the bottom of the positioning column, the limit groove is matched with the limit protrusion.

[0010] Furthermore, a spring is provided between each tensioning slider and the detection table, and a drive motor is installed in each tensioning slider. The motor shaft of the drive motor is connected to the tensioning wheel, and the chain is also connected to a pair of driven sprockets. When the drive motor drives the tensioning wheel to rotate, the chain moves accordingly, driving the two driven sprockets to rotate. At the same time, the limiting groove and the limiting protrusion constrain the rotational degree of freedom, and the two driven sprockets drive the positioning column to move up and down through helical transmission.

[0011] Furthermore, the upper part of the positioning post is provided with an annular shoulder, and a sealing sleeve is provided in the annular shoulder. The upper core of the positioning post is also provided with a support assembly, which expands the sealing sleeve outward in an inverted conical shape. First, the two positioning posts are raised by the drive motor, and then the electric push rod pushes the central linkage upward, forcing the pin to slide in the slide groove. At the same time, the opening lever tilts, expanding the sealing sleeve outward, so that the sealing sleeve opens an inverted conical sealing surface.

[0012] Furthermore, the support assembly includes an electric actuator, a central linkage, and several spreading paddles. The central linkage is mounted on the piston of the electric actuator. The spreading paddles are evenly distributed in a ring within the positioning columns. A groove is provided on the central linkage corresponding to each spreading paddle, and a pin is provided at the bottom of each spreading paddle, the pin being slidably installed in the groove. The drive motor drives the two positioning columns to descend, causing the inverted conical sealing surface and sealing ring to clamp the tubing hanger, preventing leakage at both ends and increasing the detection progress. During pressure sensor detection, if there is a leak in the tubing hanger, gas leaks from the upper part of the detection tank to the lower part, reducing the gas pressure at the upper part of the detection tank. This changes the data recorded by the pressure sensor, allowing the operator to determine if there is a problem with the tubing hanger being tested.

[0013] A method for using a sealing performance testing device for a dual-wellhead tubing hanger in a multi-gas combined production system includes the following steps: S1: Open the sealing cover, adjust the distance between the two guide sliders according to the distance between the two ends of the tubing hanger, put the tubing hanger into the testing tank, and then close the sealing cover; S2: The support assembly opens the sealing sleeve, the drive motor drives the chain to move through the tension wheel, the driven sprocket rotates and drives the positioning column to descend, and the sealing sleeve seals the two ends of the oil pipe hanger; S3: The booster pump starts to fill the detection tank with air. The air pressure squeezes the oil pipe hanger downwards. The pressure sensor receives the pressure value to determine whether the oil pipe hanger is leaking.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. By cooperating with the tension slider, tension wheel and chain symmetrically arranged in the drive unit, and with the spring automatically compensating for the chain tension, the synchronous symmetrical stepless adjustment of the center distance between the two positioning columns can be achieved. This allows for precise matching of the two port spacings of different specifications of oil pipe hangers. It can be adapted to multiple models without changing tooling, significantly improving the equipment's versatility and testing efficiency, and reducing test preparation time and operational complexity.

[0015] 2. By linking the lifting of the positioning column with the internal support assembly, the drive motor first drives the positioning column to rise into the through-hole, and then the electric push rod pushes the central linkage component, causing the pin to slide along the slide groove and force the opening plate to tilt, opening the sealing sleeve outward in an inverted cone shape to form a bidirectional sealing surface. This, together with the sealing ring, achieves reliable sealing at both ends of the hanger. During the pressure holding process, the pressure sensor monitors the pressure change in real time, effectively capturing minute leaks and improving detection accuracy and reliability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall appearance and structure of the present invention; Figure 2 This is a bottom view schematic diagram of the overall appearance of the present invention; Figure 3 This is a schematic diagram of the installation structure of the testing station of the present invention; Figure 4 This is a schematic diagram of the installation of the tubing hanger of the present invention; Figure 5 This is a schematic diagram of the bottom structure of the detection station of the present invention; Figure 6 This is a schematic diagram of the positioning column of the present invention; Figure 7 This is a schematic diagram of the installation structure of the guide slider of the present invention; Figure 8 This is a schematic diagram of the internal structure of the guide slider of the present invention; Figure 9 This is a schematic diagram of the structure of the edge support component of the present invention.

[0017] In the diagram: 1. Testing tank; 2. Sealing cover; 3. Booster pump; 4. Air pipe; 5. Pressure sensor; 6. Testing platform; 7. Oil pipe hanger; 8. Guide slider; 9. Positioning pin; 10. Sealing sleeve; 12. Sealing ring; 13. Limiting protrusion; 14. Driven sprocket; 15. Electric actuator; 16. Central linkage; 17. Spreading lever; 18. Tensioning slider; 19. Tensioning wheel; 20. Chain. Detailed Implementation

[0018] 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.

[0019] Example: Figures 1-9 As shown, the present invention provides a technical solution: a sealing performance testing device for a dual-wellhead tubing hanger in a multi-gas combined production system. The device includes a testing tank 1, a pressurizing unit, and a positioning testing unit. A neck is provided in the middle of the testing tank 1, and the tubing hanger 7 is in sealed contact with the neck. The pressurizing unit is connected to the portion above the neck of the testing tank 1, and the positioning testing unit is positioned below the neck of the testing tank 1. Before starting the test, the operator first opens the sealing cover, then adjusts the distance between the two positioning columns 9 according to the distance between the two openings of the tubing hanger 7 to be tested. Then, the tubing hanger 7 is placed into the testing tank 1, and the seal on the tubing hanger 7 contacts the neck.

[0020] The positioning and testing unit includes a testing platform 6, a first wellhead sealing section, a second wellhead sealing section, and a drive unit. The first and second wellhead sealing sections have the same structure and are symmetrically mounted on the testing platform 6. The drive unit includes two symmetrically arranged tensioning sliders 18 and a chain 20. The pair of tensioning sliders 18 are slidably connected to the testing platform 6, and each tensioning slider 18 has a tensioning wheel 19 mounted at its bottom. The chain 20 connects the pair of tensioning wheels 19 and the first and second wellhead sealing sections. The control system controls the moving module, causing the guide sliders 8 to move symmetrically on the testing platform 6 simultaneously. The positioning column 9 moves synchronously with the guide sliders 8. After the distance between the positioning column 9 and the two openings of the tubing hanger 7 is matched, the positioning column 9 can enter the interior of the tubing hanger 7. The two openings of the tubing hanger 7 are blocked by the expanded sealing sleeve 10, thus isolating the upper and lower spaces of the testing tank 1. Then, the operator closes the sealing cover 2 to prepare for a sealing test.

[0021] A sealing cover 2 is rotatably mounted on the top of the testing tank 1. The pressurization unit includes a pressurization pump 3 and an air pipe 4. The pressurization pump 3 is located on the outside of the testing tank 1. A connection hole is opened above the neck of the testing tank 1, and a one-way valve is installed in the connection hole. One end of the air pipe 4 is connected to the air filling end of the pressurization pump 3, and the other end of the air pipe 4 is connected to the connection hole. Several pressure sensors 5 are installed between the testing platform 6 and the testing tank 1. The first wellhead sealing part includes a guide slider 8 and a driven sprocket 14. The guide slider 8 is slidably connected to the testing platform 6. A moving module is installed in each guide slider 8. The moving module is connected to the control system through a circuit. The middle of the guide slider 8 is open from top to bottom. A sealing ring 12 is installed on the top of the guide slider 8. The driven sprocket 14 is rotatably mounted in the guide slider 8. The first wellhead sealing part includes a positioning pin 9, a threaded hole in the middle of the driven sprocket 14, and a threaded section on the outer contour of the positioning pin 9, which mates with the threaded hole. A limiting protrusion 13 is provided at the bottom of the guide slider 8, and a limiting groove is provided at the bottom of the positioning pin 9, which mates with the limiting protrusion 13. A spring is provided between each tensioning slider 18 and the detection platform 6. A drive motor is installed in each tensioning slider 18, and the motor shaft of the drive motor is connected to the tensioning wheel 19. The chain 20 is also connected to a pair of driven sprockets 14.

[0022] After the booster pump 3 starts, it pressurizes the upper part of the test tank 1 through the air pipe 4. The one-way valve ensures that the gas can only enter and not exit. As the air pressure in the upper part of the test tank 1 increases, the gas squeezes the oil pipe hanger 7 downward. The oil pipe hanger 7 transmits the pressure to the test platform 6 through the guide slider 8. Then, the test platform 6 applies pressure to the pressure sensor 5. When the pressurized gas pressure reaches the set value, the booster pump 3 stops pumping. The bottom of the oil pipe hanger 7 contacts the sealing ring 12 to enhance the effect of preventing leakage. During the sliding adjustment of the guide slider 8, the center distance between the two driven sprockets 14 changes. When the chain 20 begins to slack, the spring pulls the tension slider 18 to move. The two tension wheels 19 tighten the chain 20. If the chain 20 begins to tighten, the tension slider 18 overcomes the spring tension, and the two tension wheels 19 move closer to each other to compensate for the tightening movement of the chain 20. When the drive motor drives the tension wheel 19 to rotate, the chain 20 moves accordingly, and the chain 20 drives the two driven sprockets 14 to rotate. At the same time, the limiting groove and the limiting protrusion 13 constrain the degree of freedom of rotation. The two driven sprockets 14 drive the positioning column 9 to move up and down through the screw drive.

[0023] The upper part of the positioning post 9 has an annular shoulder, in which a sealing sleeve 10 is disposed. The upper core of the positioning post 9 also has a support assembly that expands the sealing sleeve 10 outward in an inverted conical shape. The support assembly includes an electric actuator 15, a central linkage 16, and several expansion paddles 17. The central linkage 16 is mounted on the piston of the electric actuator 15. The expansion paddles 17 are evenly distributed in a ring within the positioning post 9. A groove is provided on the central linkage 16 corresponding to each expansion paddle 17, and a pin is provided at the bottom of each expansion paddle 17, the pin slidingly mounted in the groove. First, the two positioning posts 9 are raised by the drive motor. Then, the electric actuator 15 pushes the central linkage 16 upward, forcing the pin to slide in the groove. Simultaneously, the expansion paddles 17 tilt, expanding the sealing sleeve 10 outward, creating an inverted conical sealing surface. The drive motor drives the two positioning columns 9 to descend, causing the inverted conical sealing surface and sealing ring 12 to clamp the oil pipe hanger 7, preventing leakage at both ends and increasing the detection progress. During the detection process of pressure sensor 5, if there is a leak in the oil pipe hanger 7, the gas in the upper part of the detection tank 1 will leak to the lower part, the gas pressure in the upper part of the detection tank 1 will decrease, and the data recorded by pressure sensor 5 will change. Then the operator can know that there is a problem with the oil pipe hanger 7 being tested.

[0024] A method for using a sealing performance testing device for a dual-wellhead tubing hanger in a multi-gas combined production system includes the following steps: S1: Open the sealing cover 2, adjust the distance between the two guide sliders 8 according to the distance between the two ends of the tubing hanger 7, put the tubing hanger 7 into the test tank 1, and then close the sealing cover 2. S2: The support assembly opens the sealing sleeve 10, the drive motor drives the chain 20 to move through the tension wheel 19, the driven sprocket 14 rotates and drives the positioning column 9 to descend, and the sealing sleeve 10 seals the two ends of the oil pipe hanger 7. S3: The booster pump 3 starts to fill the detection tank 1 with air. The air pressure squeezes the oil pipe hanger 7 downwards. The pressure sensor 5 receives the pressure value to determine whether the oil pipe hanger 7 is leaking.

[0025] The working principle of this invention is as follows: Before starting the test, the operator first opens the sealing cover, then adjusts the distance between the two positioning posts 9 according to the distance between the two openings of the tubing hanger 7 to be tested. The tubing hanger 7 is then placed into the test tank 1, with the seal on the tubing hanger 7 contacting the neck constriction. The control system controls the moving module, causing the guide slider 8 to move symmetrically on the test platform 6 simultaneously. The positioning posts 9 move synchronously with the guide slider 8. After the distance between the positioning posts 9 and the two openings of the tubing hanger 7 is matched, the positioning posts 9 can enter the interior of the tubing hanger 7. The two openings of the tubing hanger 7 are blocked by the expanded sealing sleeve 10, thus isolating the upper and lower spaces of the test tank 1. The operator then closes the sealing cover 2, preparing for the sealing test.

[0026] After the booster pump 3 starts, it pressurizes the upper part of the test tank 1 through the air pipe 4. The one-way valve ensures that the gas can only enter and not exit. As the air pressure in the upper part of the test tank 1 increases, the gas squeezes the oil pipe hanger 7 downward. The oil pipe hanger 7 transmits the pressure to the test platform 6 through the guide slider 8. Then, the test platform 6 applies pressure to the pressure sensor 5. When the pressurized gas pressure reaches the set value, the booster pump 3 stops pumping. The bottom of the oil pipe hanger 7 contacts the sealing ring 12 to enhance the effect of preventing leakage. During the sliding adjustment of the guide slider 8, the center distance between the two driven sprockets 14 changes. When the chain 20 begins to slack, the spring pulls the tension slider 18 to move. The two tension wheels 19 tighten the chain 20. If the chain 20 begins to tighten, the tension slider 18 overcomes the spring tension, and the two tension wheels 19 move closer to each other to compensate for the tightening movement of the chain 20. When the drive motor drives the tension wheel 19 to rotate, the chain 20 moves accordingly, and the chain 20 drives the two driven sprockets 14 to rotate. At the same time, the limiting groove and the limiting protrusion 13 constrain the degree of freedom of rotation. The two driven sprockets 14 drive the positioning column 9 to move up and down through the screw drive.

[0027] First, the two positioning pins 9 are raised by the drive motor. Then, the electric push rod 15 pushes the central linkage 16 upward, forcing the pin to slide in the groove. This opens the lever 17 and tilts it, pushing the sealing sleeve 10 outward to create an inverted conical sealing surface. The drive motor then drives the two positioning pins 9 downward, causing the inverted conical sealing surface and the sealing ring 12 to clamp the tubing hanger 7, preventing leakage at both ends and increasing the detection progress. During the detection process by the pressure sensor 5, if there is a leak in the tubing hanger 7, the gas in the upper part of the detection tank 1 will leak to the lower part, the gas pressure in the upper part of the detection tank 1 will decrease, and the data recorded by the pressure sensor 5 will change. Then, the operator can know that there is a problem with the tubing hanger 7 being tested.

[0028] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A sealing performance testing device for a dual-wellhead tubing hanger used in multi-gas combined production operations, characterized in that: It includes a testing tank (1), a pressurizing unit and a positioning testing unit. The testing tank (1) has a necked-out section in the middle. The oil pipe hanger (7) is in sealed contact with the necked-out section. The pressurizing unit is connected to the part above the necked-out section of the testing tank (1). The positioning testing unit is located below the necked-out section of the testing tank (1). The positioning detection unit includes a detection platform (6), a first wellhead sealing part, a second wellhead sealing part, and a drive unit. The first wellhead sealing part and the second wellhead sealing part have the same structure. The first wellhead sealing part and the second wellhead sealing part are symmetrically installed on the detection platform (6). The drive unit includes two symmetrically arranged tensioning sliders (18) and a chain (20). The pair of tensioning sliders (18) are slidably connected to the detection platform (6). Each tensioning slider (18) has a tensioning wheel (19) installed at its bottom. The chain (20) is connected between the pair of tensioning wheels (19) and the first wellhead sealing part and the second wellhead sealing part.

2. The sealing performance testing equipment for a dual-wellhead tubing hanger in a multi-gas combined production system according to claim 1, characterized in that: The top of the test tank (1) is rotatably equipped with a sealing cover (2). The pressurization unit includes a pressurization pump (3) and an air pipe (4). The pressurization pump (3) is located on the outside of the test tank (1). A connection hole is opened above the neck of the test tank (1). A one-way valve is installed in the connection hole. One end of the air pipe (4) is connected to the air filling end of the pressurization pump (3), and the other end of the air pipe (4) is connected to the connection hole.

3. The sealing performance testing equipment for a dual-wellhead tubing hanger in a multi-gas combined production system according to claim 1, characterized in that: Several pressure sensors (5) are provided between the testing platform (6) and the testing tank (1). The first wellhead sealing part includes a guide slider (8) and a driven sprocket (14). The guide slider (8) is slidably connected to the testing platform (6). A moving module is installed in each guide slider (8). The moving module is connected to the control system through a circuit. The middle of the guide slider (8) is open from top to bottom. A sealing ring (12) is installed on the top of the guide slider (8). The driven sprocket (14) is rotatably installed in the guide slider (8).

4. The sealing performance testing equipment for a dual-wellhead tubing hanger in a multi-gas combined production system according to claim 3, characterized in that: The first wellhead sealing part includes a positioning column (9), a screw hole is opened in the middle of the driven sprocket (14), a thread is opened on the outer contour of the positioning column (9), the thread is matched with the screw hole, a limiting protrusion (13) is provided at the bottom of the guide slider (8), a limiting groove is opened at the bottom of the positioning column (9), and the limiting groove is matched with the limiting protrusion (13).

5. The sealing performance testing device for a dual-wellhead tubing hanger in a multi-gas combined production system according to claim 3, characterized in that: A spring is provided between each of the tensioning sliders (18) and the testing table (6). A drive motor is provided in one of the tensioning sliders (18). The motor shaft of the drive motor is connected to the tensioning wheel (19). The chain (20) is also connected to a pair of driven sprockets (14).

6. The sealing performance testing equipment for a dual-wellhead tubing hanger in a multi-gas combined production system according to claim 3, characterized in that: The upper part of the positioning column (9) is provided with an annular shoulder platform, and a sealing sleeve (10) is provided in the annular shoulder platform. The upper core of the positioning column (9) is also provided with a support component, which supports the sealing sleeve (10) outward in an inverted cone shape.

7. The sealing performance testing device for a dual-wellhead tubing hanger in a multi-gas combined production system according to claim 6, characterized in that: The support assembly includes an electric push rod (15), a central linkage component (16), and several spreading paddles (17). The central linkage component (16) is mounted on the piston of the electric push rod (15). The several spreading paddles (17) are evenly distributed in a ring in the positioning column (9). A sliding groove is provided on the central linkage component (16) corresponding to each spreading paddle (17). A pin is provided at the bottom of each spreading paddle (17), and the pin is slidably installed in the sliding groove.

8. A method for using the sealing performance testing equipment for a multi-gas combined production dual-wellhead tubing hanger as described in any one of claims 1-7, characterized in that: Includes the following steps: S1: Open the sealing cover (2), adjust the distance between the two guide sliders (8) according to the distance between the two ports of the tubing hanger (7), put the tubing hanger (7) into the test tank (1), and then close the sealing cover (2). S2: The support assembly opens the sealing sleeve (10), the drive motor drives the chain (20) to move through the tension wheel (19), the driven sprocket (14) rotates and drives the positioning column (9) to descend, and the sealing sleeve (10) seals the two ends of the oil pipe hanger (7); S3: The booster pump (3) starts to fill the detection tank (1) with air. The air pressure squeezes the oil pipe hanger (7) downward. The pressure sensor (5) receives the pressure value to determine whether the oil pipe hanger (7) is leaking.

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