Wellhead blowout preventer pressure testing device
By introducing independent pressure testing and release channels into the wellhead blowout preventer (BOP) pressure testing device, the problem of pressure accumulation during BOP testing was solved, ensuring the safety of the pressure testing and dismantling process and improving the safety and ease of operation of well workover operations.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SINOPEC OILFIELD SERVICE CORPORATION
- Filing Date
- 2025-08-04
- Publication Date
- 2026-05-26
AI Technical Summary
In the existing technology, the pressure rises continuously during the pressure test of the blowout preventer due to the pressure trap phenomenon. If the pressure test fails, adjusting or replacing parts will increase the shut-in time, and the release of high pressure when the pressure test section is removed may cause an accident.
Design a wellhead blowout preventer pressure testing device, including a pressure testing channel and a pressure release channel, to independently conduct pressure testing and pressure release. Pressure testing and pressure release are carried out through the pressure testing inlet connector and the pressure release connector respectively, ensuring the safety of the pressure testing process and the dismantling process.
This technology enables the safe release of well pressure without affecting the original well string, preventing pressure buildup, improving the safety and ease of operation of well workover operations, and reducing operating costs.
Smart Images
Figure CN224286249U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of oil exploration equipment technology, and more specifically, to a wellhead blowout preventer pressure testing device. Background Technology
[0002] At the well workover site, after the blowout preventer is installed, a pressure test needs to be conducted at the wellhead. Construction can only proceed after the pressure test is passed.
[0003] Currently, a pressure testing sub is commonly used. Its structure consists of a lower blind flange and sidewall openings. During use, the lower end of the sub is connected to a tubing hanger to block the original well string, and the blowout preventer (BOP) is pressure tested using the sidewall openings. However, due to pressure trapping within the original well tubing string, and based on the oil and gas slippage effect, the pressure below the hanger will continuously rise as the shut-in time increases. If, at this point, the pressure test fails due to BOP installation problems or a faulty BOP itself, subsequent re-tightening or replacement of parts will further extend the shut-in time, resulting in even higher wellhead pressure that cannot be monitored. Even after a successful pressure test, when removing the pressure testing sub, the pressure under the blind flange cannot be released; it must be forcibly removed. The sudden release of high pressure could lead to a serious accident. Utility Model Content
[0004] This application provides a wellhead blowout preventer pressure testing device, which can perform pressure testing on the blowout preventer during well workover operations and release the pressure inside the well during the pressure testing process to avoid pressure accumulation and improve the safety of well workover operations.
[0005] This application provides a wellhead blowout preventer pressure testing device, comprising:
[0006] The pressure testing device body has an enclosed pressure testing channel and a pressure release channel that are not interconnected. The pressure testing device body is provided with a pressure testing connector mounting part and a pressure release connector mounting part. The pressure testing connector mounting part has an inlet channel built in. The side wall of the pressure testing device body is provided with a side wall through hole. The pressure testing channel is connected to the inlet channel and the side wall through hole. The pressure release channel is connected to the pressure space inside the original well casing.
[0007] A contact sleeve is fitted onto the outer wall of the pressure testing device body and is used for a sealing connection with the semi-sealing gate of the blowout preventer.
[0008] A pressure test inlet connector is provided at the pressure test connector mounting part and connected to the inlet channel. The pressure test inlet connector is used to connect to the pressure test pump. A pressure release connector is provided at the pressure release connector mounting part and connected to the pressure release channel.
[0009] In some embodiments, the pressure testing device body includes an inner core tube and an outer cylinder. The outer cylinder is sleeved outside the inner core tube, and the inner core tube surrounds and forms the pressure relief channel. The pressure testing channel is formed between the outer cylinder and the inner core tube. The pressure testing connector mounting part is disposed in the annular space between the outer cylinder and the inner core tube, and the pressure relief connector mounting part is disposed in the inner core tube.
[0010] In some embodiments, the outer ring of the pressure test connector mounting portion is provided with a first external thread, and the inner ring of the outer cylinder is provided with a first internal thread. The outer cylinder and the pressure test connector mounting portion are connected through the first external thread and the first internal thread.
[0011] In some embodiments, the lower part of the inner core tube is provided with a second external thread, and the lower part of the outer cylinder is provided with a second internal thread. The outer cylinder and the inner core tube are connected by the second external thread and the second internal thread.
[0012] In some embodiments, the inner ring of the contact sleeve is provided with a third internal thread, the outer ring of the outer cylinder is provided with a third external thread, and the contact sleeve and the outer cylinder are connected by the third internal thread and the third external thread.
[0013] In some embodiments, the bottom outer ring of the outer cylinder is further provided with a fourth external thread, and the outer cylinder is connected to the original well string through the fourth external thread.
[0014] In some embodiments, the fourth external thread is a tapered external thread with a gradually decreasing dimension along the axial direction and away from the pressure relief joint.
[0015] In some embodiments, there are multiple contact sleeves arranged at intervals along the axial direction, and each contact sleeve is sealed to the blowout preventer semi-sealing gate.
[0016] In some embodiments, the device further includes a first pressure monitoring gauge and a first pressure relief device. The first pressure monitoring gauge and the first pressure relief device are disposed on the test joint mounting portion. The first pressure monitoring gauge is used to monitor the test pressure value of the test pressure channel, and the first pressure relief device is used to relieve pressure on the test pressure channel when the test pressure value exceeds a preset test pressure value.
[0017] In some embodiments, the device further includes a second pressure monitor and a second pressure relief device. The second pressure monitor and the second pressure relief device are disposed on the pressure relief connector mounting portion. The second pressure monitor is used to monitor the pressure relief value of the pressure relief channel, and the second pressure relief device is used to relieve pressure on the pressure relief channel when the pressure relief value exceeds a preset test pressure value.
[0018] In this embodiment, the pressure testing device has a pressure testing channel and a pressure release channel inside, which operate independently. During pressure testing, the pressure testing medium passes through the pressure testing inlet connector and the pressure testing channel to test the semi-sealed gate of the blowout preventer. At this time, the pressure in the well tubing is sealed by a stopcock valve connected to the pressure release connector. Since the pressure testing channel and the pressure release channel are independent, they do not affect each other. After the pressure testing operation is completed, when the device needs to be dismantled, the pressure in the well is released independently through the pressure release channel and the pressure release connector to avoid pressure accumulation and ensure the safety of the dismantling operation. The wellhead blowout preventer pressure testing device provided in this application can achieve semi-sealed pressure testing of the blowout preventer without moving the original well tubing, and can effectively release the accumulated pressure in the tubing, achieving non-pressurized operation, improving the safety of on-site operations. It has a simple structure, is easy to operate, and has low operating costs. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0020] Figure 1 A schematic diagram of a wellhead blowout preventer pressure testing device provided in some embodiments of this application;
[0021] Figure 2 This is an assembly diagram of a wellhead blowout preventer pressure testing device provided in some embodiments of this application.
[0022] The attached figures are labeled as follows:
[0023] 10-Wellhead blowout preventer pressure testing device; 20-Blowout preventer; 30-Wellhead hanger; 40-Wellhead; 50-Blowout preventer semi-sealed pressure testing space; 60-Original well casing internal pressure space;
[0024] 1-Testing device body; 2-Contact sleeve; 3-Testing inlet connector; 4-Pressure release connector;
[0025] 11-Inner core tube; 12-Outer cylinder;
[0026] 101-Pressure test channel; 102-Pressure release channel; 103-Inlet channel; 104-Side wall through hole; 201-Blowout preventer semi-sealing gate. Detailed Implementation
[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0028] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. The terms "first," "second," etc., are used to distinguish different objects, not to describe a particular order or hierarchy.
[0029] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.
[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0031] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.
[0032] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.
[0033] In this application, "multiple" means two or more (including two).
[0034] Please refer to Figure 1 This application provides a wellhead blowout preventer (BOP) pressure testing device, mainly comprising: a pressure testing device body 1, a contact sleeve 2, a pressure testing inlet connector 3, and a pressure relief connector 4. The pressure testing device body 1 internally encloses a pressure testing channel 101 and a pressure relief channel 102, which are not interconnected to ensure that the pressure testing and pressure relief processes do not interfere with each other. The pressure testing device body 1 is provided with a pressure testing connector mounting part and a pressure relief connector mounting part. The pressure testing connector mounting part has an inlet channel 103 built into it. The pressure testing inlet connector 3 is located in the pressure testing connector mounting part and connected to the inlet channel 103. The pressure testing inlet connector 3 is fixedly connected to an external pressure testing pump or pressure testing gun (not shown in the figure). The inlet channel 103 serves as the inlet for the pressure testing medium, introducing high-pressure liquid or gas into the pressure testing channel 101 to complete the BOP 20 sealing test. The side wall of the pressure testing device body 1 is provided with a side wall through hole 104, allowing the pressure testing medium to enter the pressure testing space of the BOP semi-sealed gate 201.
[0035] The test medium (such as water or hydraulic oil) enters the inlet channel 103 from the test pump through the test inlet connector 3, flows through the test channel 101 to the side wall through hole 104, and finally enters the test space of the blowout preventer semi-sealed gate 201 to complete the test operation.
[0036] The pressure testing device body 1 is equipped with a pressure relief connector mounting section, which is used to install the pressure relief connector 4. The pressure relief connector 4 connects to an external stopcock valve or pressure relief manifold (not shown in the figure) to control the release of pressure inside the well. During the pressure test, the pressure inside the original well string is transmitted to the pressure relief connector 4 through the pressure relief channel 102 to prevent pressure buildup. After the pressure test is completed, the pressure can be released by connecting the stopcock valve or pressure relief pipeline through the pressure relief connector 4 to ensure safety during device removal.
[0037] The contact sleeve 2 is fitted onto the outer wall of the pressure testing device body 1 to form a sealed connection with the blowout preventer semi-sealing gate 201, ensuring no leakage during the pressure testing process.
[0038] In this embodiment, both the pressure testing connector mounting part and the pressure releasing connector mounting part can be located on the upper end or side of the pressure testing device body 1, and their number can be one or more, without limitation.
[0039] In use, connect the lower end of the device to the wellhead hanger, and close the blowout preventer semi-sealing gate 201 to seal it against the contact sleeve 2. Connect the test pressure inlet connector 3 to the test pressure pump, and the pressure relief connector 4 to the plug valve. The test pressure medium enters the blowout preventer semi-sealing test space 50 through the test pressure channel 101, and the pressure inside the well is released through the pressure relief channel 102. After the test is completed, first release the pressure of the test pressure pump, then release the pressure through the pressure relief channel 102, and finally remove the device.
[0040] The wellhead blowout preventer pressure testing device provided in this application has an independent pressure testing channel 101 and a pressure release channel 102 inside the main body 1. During the pressure test, the pressure testing medium is used to test the blowout preventer semi-sealing gate 201 through the pressure testing channel 101, and the pressure inside the well is released through the pressure release channel 102. This solution solves the problems of pressure accumulation and dismantling risks in traditional pressure testing solutions by using independent dual channels, thereby improving operational safety. The pressure testing channel 101 and the pressure release channel 102 work independently to avoid pressure accumulation inside the well and ensure dismantling safety. Its structure is simple, its operation is convenient, and it reduces operating costs.
[0041] In one specific embodiment, the pressure testing device body 1 includes an inner core tube 11 and an outer cylinder 12. The inner core tube 11 is a tubular structure, shaped like a "T" with a wider top and narrower bottom, and its hollow interior forms a pressure relief channel 102. A pressure relief connector mounting part is provided at the end of the inner core tube 11. The outer cylinder 12 is a tubular or cylindrical structure, sleeved outside the inner core tube 11, and coaxially arranged with it. The annular space between the inner wall and the outer wall of the inner core tube forms the pressure testing channel 101, used for injecting the pressure testing medium. A pressure testing connector mounting part is provided on the side wall or end for connecting a pressure testing pump or pressure gun. The inner core tube is installed inside the outer cylinder 12 from top to bottom, and the contact sleeve 2 is installed outside the outer cylinder 12. The outer cylinder 12 and the inner core tube 11 are connected by interference fit, welding, or threads to form a double-layer sleeve structure, ensuring the sealing of the pressure testing channel 101. The annular space between the outer wall of the inner core tube 11 and the inner wall of the outer cylinder 12 is closed. The pressure relief channel 102 is independent of the pressure test channel 101 and is connected to the external pressure relief system through the pressure relief connector mounting part.
[0042] When using the wellhead 40 in practice, first ensure that the hydraulic well for well repair meets the construction requirements, then remove the original wellhead, install the blowout preventer 20, then connect the lower end of the blowout preventer test device to the wellhead hanger 30, close the blowout preventer semi-sealing gate 201 and the contact sleeve 2 of the wellhead blowout preventer test device 10 to complete the well sealing; after that, connect the test pump or test gun to the test inlet connector 3 of the test device body 1, and connect the plug valve or pressure relief manifold to the pressure relief connector 4 of the test device body 1.
[0043] After all the devices are connected, pressure testing begins to verify the sealing performance of the blowout preventer's semi-sealed gate 201. The test pressure medium enters sequentially from the test pressure pump into the test pressure inlet connector 3, test pressure channel 101, side wall through hole 104, and blowout preventer semi-sealed test pressure space 50. Pressure testing and stabilization are performed according to the blowout preventer 20 test requirements. During the pressure test, when pressure accumulates in the original well tubing, this pressure is transmitted sequentially through the pressure space 60 inside the original well tubing, the internal space of the inner core tube 11, and the pressure relief connector 4 to the plug valve or pressure relief manifold. Depending on environmental protection requirements and the medium and pressure inside the well, either release or seal the blowout.
[0044] In one specific embodiment, the outer ring of the pressure test connector mounting part is provided with a first external thread, and the inner ring of the outer cylinder 12 is provided with a first internal thread. The outer cylinder 12 and the pressure test connector mounting part are connected through the first external thread and the first internal thread to achieve a sealed connection between the two. Therefore, threads are provided at the upper ends of both the outer cylinder 12 and the inner core tube 11. The upper inner end of the outer cylinder 12 is provided with an internal connecting thread for connection to the pressure relief connector. The upper body of the inner core tube 11 is provided with an inlet channel 103 along the axial direction. The upper end of the inlet channel 103 is provided with an internal thread for connection to the pressure test inlet connector 3.
[0045] Furthermore, the lower part of the inner core tube 11 is provided with a second external thread, and the outer cylinder 12 has a U-shaped tubular structure. The lower part of the outer cylinder 12 is provided with a second internal thread, and the outer cylinder 12 and the inner core tube 11 are connected by the second external thread and the second internal thread. By providing a second external thread on the lower end of the inner core tube 11 and a second internal thread on the lower end of the outer cylinder 12, the inner core tube 11 and the outer cylinder 12 are threadedly connected to achieve screw-in installation and a sealing function.
[0046] In addition, a third internal thread can be provided on the inner ring of the contact sleeve 2, and a third external thread can be provided on the outer ring of the outer cylinder 12. The contact sleeve 2 and the outer cylinder 12 are connected by the third internal thread and the third external thread. The contact sleeve 2 is an internally threaded cylinder, which is screwed into the external connecting thread in the middle of the outer cylinder 12. After the inner core tube 11 is connected to the outer cylinder 12, it is inserted into the contact sleeve 2 from the top and tightened to achieve a seal.
[0047] In addition, the bottom outer ring of the outer cylinder 12 is provided with a fourth external thread, and the outer cylinder 12 is connected to the original well string through the fourth external thread to improve the sealing performance of the connection between the outer cylinder 12 and the original well string.
[0048] Optionally, the fourth external thread is a tapered external thread with a gradually decreasing dimension along the axial direction and away from the pressure relief connector. The tapered external thread's gradually decreasing structure along the axial direction facilitates centering and screwing in, making installation convenient. Furthermore, the tapered end can serve as a guide, guiding the thread to engage smoothly and preventing mis-threading or damage to the thread profile.
[0049] The wellhead blowout preventer pressure testing device provided in this embodiment, except that the outer thread at the bottom of the outer cylinder 12 is a tapered thread, can be directly connected to the wellhead hanger 30, and the rest of the threads are ordinary threads.
[0050] In one specific embodiment, multiple contact sleeves 2 can be provided. The contact sleeves 2 are arranged at intervals along the axial direction. The number of contact sleeves 2 is the same as the number of blowout preventer semi-sealing gates 201. Each contact sleeve 2 is sealed to the corresponding blowout preventer semi-sealing gate 201. Thus, the pressure test operation of multi-stage blowout preventers can be completed without replacing the pressure test device corresponding to the size of each blowout preventer 20.
[0051] In this embodiment, the contact sleeve 2 can be manufactured in different models to accommodate different blowout preventer (BOP) sizes, thus adapting to different models of BOP semi-sealing gates 201. Furthermore, multi-stage BOP pressure testing can be achieved by stacking multiple contact sleeves 2. Optionally, one contact sleeve 2 corresponds to one BOP semi-sealing gate 201. By replacing contact sleeves 2 of different sizes or by connecting multiple contact sleeves 2, different BOP models can be adapted, and multi-stage BOP pressure testing can be achieved. The contact sleeve 2 fits snugly and seals against the BOP semi-sealing gate, ensuring no leakage during the pressure test.
[0052] To improve operational safety, a first pressure monitoring gauge and a first pressure relief device can be installed at the pressure test connector mounting part. The first pressure monitoring gauge is used to monitor the test pressure value of the test pressure channel 101, and the first pressure relief device is used to relieve pressure on the test pressure channel 101 during pressure testing (for example, when the test pressure value detected by the first pressure monitoring gauge exceeds the preset test pressure value) to ensure the safety of the pressure test operation.
[0053] In addition, a second pressure monitoring gauge and a second pressure relief device can be installed at the pressure relief connector mounting part. The second pressure monitoring gauge is used to monitor the pressure relief value of the pressure relief channel 102, and the second pressure relief device is used to relieve pressure on the pressure relief channel 102 when the pressure relief value exceeds the preset test pressure value, so as to ensure the safety of the pressure relief process.
[0054] After the wellhead blowout preventer pressure testing device is installed, two independent channels are formed inside the main body 1 of the pressure testing device: a pressure testing channel 101 and a pressure release channel 102. The pressure testing channel 101 is composed of the pressure testing inlet connector 3, the inlet channel 103, the circumferential space between the outer cylinder 12 and the inner core tube 11, and the side wall through hole 104. The pressure release channel 102 is composed of the pressure release connector and the inner cavity of the inner core tube 11.
[0055] The wellhead blowout preventer pressure testing device provided in this application, when in use, involves placing the assembled wellhead blowout preventer pressure testing device 10 into the blowout preventer from top to bottom, as per reference. Figure 2 The lower end of the outer cylinder 12 is connected to the wellhead hanger 30 via a male thread, and the blowout preventer semi-sealing gate 201 is sealed to the contact sleeve 2. Afterwards, a pressure testing pump or pressure testing gun is connected to the pressure testing inlet connector 3, and a stopcock valve or other pressure relief line is connected to the pressure relief connector.
[0056] During pressure testing, the test medium is applied to the semi-sealed gate 201 of the blowout preventer through test channel 101. At this time, the pressure in the well tubing is sealed by a stopcock valve connected to the pressure relief connector. Test channel 101 and pressure relief channel 102 are independent and do not affect each other. After the pressure test is completed and the device needs to be dismantled, pressure relief channel 102 is used to release pressure separately to ensure safe dismantling operations.
[0057] The wellhead blowout preventer pressure testing device provided in this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of this application.
Claims
1. A wellhead blowout preventer pressure testing device, characterized in that, include: The pressure testing device body (1) has a pressure testing channel (101) and a pressure release channel (102) that are not interconnected inside. The pressure testing device body (1) is provided with a pressure testing connector installation part and a pressure release connector installation part. The pressure testing connector installation part has an inlet channel (103) built in. The side wall of the pressure testing device body (1) is provided with a side wall through hole (104). The pressure testing channel (101) is connected to the inlet channel (103) and the side wall through hole (104). The pressure release channel (102) is connected to the pressure space (60) inside the original well casing. Contact sleeve (2), the contact sleeve (2) is fitted onto the outer wall of the test pressure device body (1) for sealing connection with the semi-sealing gate of the blowout preventer (20); The pressure test inlet connector (3) is provided at the pressure test connector mounting part and is connected to the inlet channel (103). The pressure test inlet connector (3) is used to connect the pressure test pump. Pressure relief connector (4) is provided at the pressure relief connector mounting part and is connected to the pressure relief channel (102).
2. The wellhead blowout preventer pressure testing device according to claim 1, characterized in that, The pressure testing device body (1) includes an inner core tube (11) and an outer cylinder (12). The outer cylinder (12) is sleeved on the outside of the inner core tube (11). The inner core tube (11) surrounds and forms the pressure relief channel (102). The pressure testing channel (101) is formed between the outer cylinder (12) and the inner core tube (11). The pressure testing connector mounting part is disposed in the annular space between the outer cylinder (12) and the inner core tube (11). The pressure relief connector mounting part is disposed in the inner core tube (11).
3. The wellhead blowout preventer pressure testing device according to claim 2, characterized in that, The outer ring of the pressure test connector mounting part is provided with a first external thread, and the inner ring of the outer cylinder (12) is provided with a first internal thread. The outer cylinder (12) and the pressure test connector mounting part are connected through the first external thread and the first internal thread.
4. The wellhead blowout preventer pressure testing device according to claim 2 or 3, characterized in that, The lower part of the inner core tube (11) is provided with a second external thread, and the lower part of the outer cylinder (12) is provided with a second internal thread. The outer cylinder (12) and the inner core tube (11) are connected by the second external thread and the second internal thread.
5. The wellhead blowout preventer pressure testing device according to claim 4, characterized in that, The inner ring of the contact sleeve (2) is provided with a third internal thread, and the outer ring of the outer cylinder (12) is provided with a third external thread. The contact sleeve (2) and the outer cylinder (12) are connected by the third internal thread and the third external thread.
6. The wellhead blowout preventer pressure testing device according to claim 2, characterized in that, The bottom outer ring of the outer cylinder (12) is also provided with a fourth external thread, and the outer cylinder (12) is connected to the original well string through the fourth external thread.
7. The wellhead blowout preventer pressure testing device according to claim 6, characterized in that, The fourth external thread is a tapered external thread with a gradually decreasing dimension along the axial direction and away from the pressure relief joint (4).
8. The wellhead blowout preventer pressure testing device according to claim 1, characterized in that, There are multiple contact sleeves (2) arranged at intervals along the axial direction, and each contact sleeve (2) is sealed to the blowout preventer semi-sealing gate (201).
9. The wellhead blowout preventer pressure testing device according to claim 1, characterized in that, It also includes a first pressure monitoring gauge and a first pressure relief device. The first pressure monitoring gauge and the first pressure relief device are disposed on the test pressure connector mounting part. The first pressure monitoring gauge is used to monitor the test pressure value of the test pressure channel (101). The first pressure relief device is used to relieve pressure on the test pressure channel (101) when the test pressure value exceeds the preset test pressure value.
10. The wellhead blowout preventer pressure testing device according to claim 9, characterized in that, It also includes a second pressure monitoring gauge and a second pressure relief device. The second pressure monitoring gauge and the second pressure relief device are disposed on the pressure relief connector mounting part. The second pressure monitoring gauge is used to monitor the pressure relief value of the pressure relief channel (102). The second pressure relief device is used to relieve pressure on the pressure relief channel (102) when the pressure relief value exceeds the preset test pressure value.