An anticorrosion test instrument wellhead blowout preventer

Abstract

This utility model discloses a corrosion-resistant wellhead blowout preventer for testing instruments, comprising an upper sealing body, within which are an upper sealing mechanism and a lower sealing mechanism. The upper sealing body also includes an upper injection mechanism for applying pressure to both the upper and lower sealing mechanisms. This utility model improves work efficiency by simultaneously applying pressure to both the upper and lower sealing mechanisms through the upper injection mechanism. The three sealing mechanisms, the friction between the straightening pipe and the cable, and the anchoring force of the slip mechanism prevent cable displacement. The hydraulic oil injected through the lower injection pipe isolates corrosive media, preventing corrosion of components above the isolation pipe. This utility model prevents corrosion of the blowout preventer and downward displacement of the testing instrument, thereby enabling the acquisition of accurate reservoir data and providing reliable data for oilfield development, resulting in significant economic benefits.

Description

Technical Field

[0001] This utility model relates to the field of oil extraction technology, specifically to a corrosion-resistant testing instrument wellhead blowout preventer. Background Technology

[0002] Injecting CO2 into the oil-bearing formation to drive the oil to flow is a technology used in oilfields to improve oil production rate and volume. To ensure the effectiveness of CO2-driven blocks, it is necessary to test the wells that have shown results after CO2 injection, collect data for analysis and judgment, and provide a guarantee for efficient oilfield exploitation.

[0003] Testing successful wells after CO2 injection involves lowering testing instruments via cable from the wellhead to the oil layer to measure production data. During testing, the weight of the cable and instruments must be suspended from the wellhead. Because the wellhead pressure in flowing wells is higher than atmospheric pressure, a blowout preventer (BOP) is required. The testing cable passing through the BOP needs a sealing mechanism to maintain a seal between the cable's outer wall and the BOP. However, since successful wells in CO2-driven blocks produce CO2 gas, this gas can corrode the sealing mechanism of the BOP. Corrosion of the sealing mechanism can lead to blowouts and significant economic losses. Furthermore, it can prevent the cable and instruments from being suspended from the wellhead. Additionally, the long testing duration (generally over a year) can cause displacement of the testing cable and instruments, altering the instrument's position and resulting in inaccurate oil layer data, misleading oilfield development.

[0004] Publication No. CN117684908A discloses a wellhead cable sealing device and implementation method for use in stratified gas injection wells. The device includes a primary sealing section, a secondary sealing section, a tertiary sealing section, a pressurizing section, and an airtight section. Steel pipe cables pass through the interiors of the primary, secondary, and tertiary sealing sections, and the steel pipe cables are connected to instruments and counterweights. A first sealing device is provided between the primary and secondary sealing sections, and a second sealing device is provided between the secondary and tertiary sealing sections. The tertiary sealing section is used to connect to the blowout preventer and the wellbore, and a third sealing device is provided at the junction of the tertiary sealing section and the wellbore. The pressurizing section is connected to the secondary and tertiary sealing sections, and the airtight section is connected to the primary sealing section.

[0005] The prior art achieves three-stage injection and pressure sealing, but one injection head corresponds to one sealing structure. In the upper sealing body of this patent, one injection head corresponds to two sealing structures. The operating efficiency of this patent is higher than that of the prior art.

[0006] Announcement No. CN213392081U discloses a novel cable sealing blowout preventer, comprising a primary blowout preventer, a secondary blowout preventer, and a pressure relief mechanism; each of the primary, secondary, and pressure relief mechanisms has a central channel that allows the cable to pass through, and both the primary and secondary blowout preventers compress and seal the cable; the upper end of the pressure relief mechanism is connected to the primary blowout preventer, and the lower end of the pressure relief mechanism is connected to the secondary blowout preventer.

[0007] The existing technology achieves packing compression through rotation, which is inefficient. The operating efficiency of this patent is higher than that of the existing technology.

[0008] Announcement No. CN222141184U discloses a device for straightening steel pipe cables during testing, including a buffer assembly and a guide joint; the buffer assembly includes a spring shaft, a spring, a connecting pin, and a telescopic sleeve; the outer wall of the spring shaft is provided with a first shoulder, the outer wall of the telescopic sleeve is provided with a second shoulder, the telescopic sleeve is provided with a groove below the second shoulder, the connecting pin passes through the groove and is inserted into the outer wall of the spring shaft; the spring is located between the first shoulder and the second shoulder; the guide joint can be inserted into the lower end of the telescopic sleeve.

[0009] This existing technology can be used for cable straightening, but it cannot solve the wellhead sealing problem in CO2-driven reservoirs.

[0010] In summary, the technical solutions, technical problems to be solved, and beneficial effects of the above-disclosed technologies are all different from those of this utility model. For more technical features, technical problems to be solved, and beneficial effects of this utility model, the above-disclosed technical documents do not provide any technical inspiration. Utility Model Content

[0011] In order to overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, this utility model provides a corrosion-resistant test instrument wellhead blowout prevention device.

[0012] To achieve the above objectives, the present invention adopts the following technical solution:

[0013] A corrosion-resistant wellhead blowout preventer for testing instruments includes an upper sealing body, within which an upper sealing mechanism and a lower sealing mechanism are disposed. The upper sealing body is also provided with an upper injection mechanism for applying pressure to the upper and lower sealing mechanisms.

[0014] Furthermore, the upper sealing mechanism includes an upper pressure element, a pressure cap, an upper sealing element, and a seat pad;

[0015] Specifically, the upper inner wall of the upper sealing body is provided with an upward positioning step, the seat cushion is placed on the upper positioning step, the upper sealing element is placed on the seat cushion, the upper pressing element is placed on the upper sealing element, the pressure cap is connected to the upper outer wall of the upper sealing body, and the pressure cap presses the upper pressing element and the upper sealing element together.

[0016] Specifically, the lower sealing mechanism includes a lower pressure transmission component, a lower sealing component, and a seat connector;

[0017] Specifically, the seat joint is connected to the lower inner wall of the lower sealing body, the lower sealing element is placed on the seat joint, and the inner wall of the lower sealing body is provided with a downward positioning step above the lower sealing element. The lower pressure transmission element is slidably locked between the lower positioning step and the lower sealing element.

[0018] Specifically, the upper injection mechanism includes an upper injection tube;

[0019] Specifically, the upper sealing body has a radial connecting hole and a side wall connecting hole on its side wall. The radial connecting hole is spatially connected to the sealing sleeve and the lower sliding sleeve. The radial connecting hole is spatially connected to the gland and the upper sliding sleeve through the side wall connecting hole. The upper injection pipe is sealed to the radial connecting hole. The injection port of the upper injection pipe is equipped with an upper check valve.

[0020] Furthermore, the upper pressure component includes an upper sliding sleeve, the outer wall of the upper sliding sleeve having a small upper diameter and a large lower diameter, the small diameter of the outer wall of the upper sliding sleeve mates with the inner wall of the pressure cap, and the large diameter of the outer wall of the upper sliding sleeve mates with the inner wall of the upper sealing body;

[0021] Specifically, the lower pressure transmission component includes a sealing sleeve and a sliding sleeve;

[0022] Specifically, the outer wall of the sliding sleeve has a small diameter at the top and a large diameter at the bottom. The small diameter of the outer wall of the sliding sleeve matches the inner wall of the sealing sleeve, and the large diameter of the outer wall of the sliding sleeve matches the inner wall of the upper sealing body.

[0023] Specifically, the outer wall of the sealing sleeve mates with the inner wall of the upper sealing body, and the upper end of the sealing sleeve is positioned with the lower positioning step.

[0024] Furthermore, the upper end of the pressure cap is connected to a clamping seat, and a clamping mechanism is placed inside the clamping seat, which can clamp the cable;

[0025] Specifically, the lower inner wall of the seat joint is connected to the centering seat.

[0026] Furthermore, it also includes a lower sealing body, the upper end of which is connected to the lower end of the upper sealing body. A pressure-isolating sealing mechanism is provided inside the lower sealing body, and a lower injection mechanism is provided in the lower sealing body for applying pressure to the pressure-isolating sealing mechanism.

[0027] Furthermore, the pressure-isolating sealing mechanism includes a pressure ring, a pressure-isolating sealing element, and a support;

[0028] Specifically, the support is connected to the lower inner wall of the lower sealing body, the pressure-isolating seal is placed on the support, the lower inner wall of the lower sealing body is provided with a downward pressure-isolating step above the support, and the pressure ring is located between the pressure-isolating seal and the pressure-isolating step.

[0029] Specifically, the injection mechanism includes an injection tube;

[0030] Specifically, the lower sealing body is provided with a radial injection hole, which communicates with the space above the pressure ring. The lower injection pipe is connected to the radial injection hole, and the injection port of the lower injection pipe is provided with a lower check valve.

[0031] Furthermore, it also includes a rotary sealing mechanism, through which the upper sealing body and the lower sealing body are connected.

[0032] Furthermore, the rotary sealing mechanism includes an upper suspension sleeve, a lower suspension sleeve, and an adapter;

[0033] Specifically, the upper end of the upper suspension sleeve is connected to the lower end of the upper sealing body, the lower end of the adapter is connected to the upper end of the lower sealing body, an inner locking ring is provided on the outer wall of the upper suspension sleeve, an outer locking ring is provided on the inner wall of the lower suspension sleeve, the lower suspension sleeve is fitted on the outer wall of the upper suspension sleeve, the outer locking ring is located above the inner locking ring, the upper suspension sleeve is sealed and inserted into the adapter, the upper suspension sleeve and the adapter can rotate relative to each other, and the upper end of the lower suspension sleeve is connected to the lower end of the adapter.

[0034] Furthermore, the upper suspension sleeve is connected to the upper sealing body via an upper connecting sleeve, and the adapter is connected to the lower sealing body via an isolation pipe.

[0035] Furthermore, a lifting ring is connected to the outer wall of the isolation pipe.

[0036] Compared with the prior art, the present invention has the following advantages:

[0037] 1. This utility model, through the side wall connecting hole, radial connecting hole, and upper injection pipe, enables the upper injection mechanism to simultaneously apply pressure to the upper sealing mechanism and the lower sealing mechanism, thereby improving working efficiency.

[0038] 2. This utility model prevents the logging cable from moving downwards through a slip mechanism. The hydraulic oil injected through the injection pipe can isolate the well fluid from the upper sealing mechanism, the lower sealing mechanism, and the slip mechanism. Multiple straightening pipes are set to keep the logging cable in the center.

[0039] 3. The three-seal mechanism, the friction between the straightening pipe and the cable, and the anchoring force of the slip mechanism of this utility model can prevent cable displacement. The hydraulic oil injected through the lower injection pipe can isolate corrosive media so that it will not corrode the components above the isolation pipe. This utility model can prevent the blowout preventer from being corroded and the testing instrument from shifting downward, thereby enabling the testing of accurate oil layer data, providing a reliable basis for oilfield development, and having significant economic benefits. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of a wellhead blowout preventer for a corrosion-resistant testing instrument according to this utility model.

[0041] In the diagram: 1. Test cable; 2. Slip mechanism; 3. Slip seat; 4. Upper sliding sleeve; 5. Upper straightening tube; 6. Pressure cap; 7. Upper retaining sleeve; 8. Upper seal; 9. Seat pad; 10. Upper sealing body; 10-1. Side wall connecting hole; 10-2. Radial connecting hole; 12. Upper straightening tube; 13. Lower seal; 14. Seat connector; 15. Straightening seat; 16. Lower straightening tube; 17. Lower retaining ring; 18. Upper connecting sleeve; 19. Upper suspension sleeve; 20. Lower suspension sleeve; 21. Adapter; 22. Lifting ring; 23. Isolation tube; 24. Pressure ring; 25. Lower sealing body; 26. Pressure isolation seal; 27. Support seat; 28. Straightening tube; 29. ​​Retaining ring; 30. Upper injection tube; 31-1. Upper check valve; 32. Lower sliding sleeve; 33. Lower injection tube. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0043] Example 1:

[0044] Please see Figure 1 This embodiment provides a corrosion-resistant wellhead blowout preventer for testing instruments, including an upper sealing body 10. The upper sealing body 10 is provided with an upper sealing mechanism and a lower sealing mechanism. The upper sealing body 10 is also provided with an upper injection mechanism for applying pressure to the upper and lower sealing mechanisms.

[0045] Furthermore, the upper sealing mechanism includes an upper pressing component, a pressure cap 6, an upper sealing component 8, and a seat pad 9. The upper inner wall of the upper sealing body 10 is provided with an upward-facing upper positioning step. The seat pad 9 is placed on the upper positioning step, the upper sealing component 8 is placed on the seat pad 9, the upper pressing component is placed on the upper sealing component 8, the pressure cap 6 is threaded to the upper outer wall of the upper sealing body 10 and sealed by a sealing ring, and the pressure cap 6 presses the upper pressing component and the upper sealing component 8 together.

[0046] Specifically, the upper pressure component includes an upper sliding sleeve 4, the outer wall of the upper sliding sleeve 4 having a small upper diameter and a large lower diameter, the small diameter of the outer wall of the upper sliding sleeve 4 being sealed to the inner wall of the pressure cap 6 by a sealing ring, and the large diameter of the outer wall of the upper sliding sleeve 4 being sealed to the inner wall of the upper sealing body 10 by a sealing ring.

[0047] Furthermore, the lower sealing mechanism includes a lower pressure transmitting component, a lower sealing component 14, and a seat connector 15. The seat connector 15 is threadedly connected to the lower inner wall of the lower sealing body 10 and sealed by a sealing ring. The lower sealing component 14 is placed on the seat connector 15. The inner wall of the lower sealing body 10 has a downward-facing lower positioning step above the lower sealing component 14. The lower pressure transmitting component is slidably engaged between the lower positioning step and the lower sealing component 14.

[0048] Specifically, the lower pressure transmission component includes a sealing sleeve and a lower sliding sleeve 32. The outer wall of the lower sliding sleeve 4 has a small upper diameter and a large lower diameter. The small diameter of the outer wall of the lower sliding sleeve 4 is sealed to the inner wall of the sealing sleeve by a sealing ring. The large diameter of the outer wall of the lower sliding sleeve 4 is sealed to the inner wall of the upper sealing body 10 by a sealing ring. The outer wall of the sealing sleeve is sealed to the inner wall of the upper sealing body 10 by a sealing ring. The upper end of the sealing sleeve is positioned with the lower positioning step.

[0049] Furthermore, the upper injection mechanism includes an upper injection pipe 31. The sidewall of the upper sealing body 10 is provided with a radial connecting hole 10-2 and a sidewall connecting hole 10-1. The radial connecting hole 10-2 is spatially connected to the sealing sleeve and the lower sliding sleeve 32. The radial connecting hole 10-2 is spatially connected to the pressure cap 6 and the upper sliding sleeve 4 through the sidewall connecting hole 10-1. The upper injection pipe 31 is connected to the radial connecting hole 10-2 by a thread and sealed by a sealing ring. The injection port of the upper injection pipe 31 is provided with an upper check valve 31-1 to prevent fluid leakage. Hydraulic oil is injected into the space between the sealing sleeve and the lower sliding sleeve 32, and the space between the pressure cap 6 and the upper sliding sleeve 4 through the upper check valve 31-1, so that the lower sliding sleeve 32 moves down to press the lower sealing element 14, and the upper sliding sleeve 4 moves down to press the upper sealing element 8.

[0050] Furthermore, the upper end of the pressure cap 6 is connected to the clamping seat 3, and the clamping mechanism 2 is placed inside the clamping seat 3. The clamping mechanism 2 clamps the cable 1, preventing the cable 1 from displacing downward.

[0051] Specifically, the clamp seat 3 is a conical opening, and the clamp mechanism 2 is a split conical head. The cable 1 moves down to make the clamp mechanism 2 and the clamp seat 3 tightly connected to achieve complete positioning. In use, an isolation ring can be set between the clamp seat 3 and the clamp mechanism 2 to prevent the clamp seat 3 and the clamp mechanism 2 from accidentally connecting. The isolation ring is an open ring or easily cut. When it is necessary to anchor the test cable 1, the isolation ring is removed.

[0052] Example 2:

[0053] Based on Embodiment 1, this embodiment also includes a lower sealing body 26, the upper end of which is connected to the lower end of the upper sealing body 10. A pressure-isolating sealing mechanism is provided inside the lower sealing body 26, and a lower injection mechanism is provided in the lower sealing body 26 for applying pressure to the pressure-isolating sealing mechanism.

[0054] The pressure-isolating sealing mechanism includes a pressure ring 25, a pressure-isolating sealing element 27, and a support 28. The support 28 is threadedly connected to the lower inner wall of the lower sealing body 26. The pressure-isolating sealing element 27 is placed on the support 28. The lower inner wall of the lower sealing body 26 has a downward-facing pressure-isolating step above the support 28. The pressure ring 25 is located between the pressure-isolating sealing element 27 and the pressure-isolating step.

[0055] The lower injection mechanism includes a lower injection pipe 33. The lower sealing body 26 is provided with a radial injection hole. The radial injection hole communicates with the space above the pressure ring 25. The lower injection pipe 33 is threadedly connected to the radial injection hole and sealed by a sealing ring. The injection port of the lower injection pipe 33 is provided with a lower check valve 33-1. Hydraulic oil is injected through the lower check valve 33-1, causing the pressure ring 25 to move down and press against the pressure isolation seal 27.

[0056] The lower outer wall of the lower sealing body 26 is used to connect with the blowout preventer.

[0057] When hydraulic oil is injected into the upward injection pipe 31 and the lower injection pipe 33, the upper seal 8, the lower seal 14, and the pressure isolation seal 27 cover the test cable 1 to maintain a seal and keep the test cable 1 from displacement under the action of friction.

[0058] The hydraulic oil injected through the lower injection pipe 33 isolates the well fluid from the upper sealing mechanism, lower sealing mechanism, and slip mechanism, preventing these components from being corroded by CO2 gas in the well fluid. This invention is convenient to use and reliable in operation.

[0059] Example 3:

[0060] Based on Example 2, this example further improves the device's uprighting performance.

[0061] The inner wall of the upper sliding sleeve 4 has a small diameter, a medium diameter, and a large diameter from top to bottom. The upper straightening tube 5 is fitted onto the medium diameter of the inner wall of the upper sliding sleeve 4. The upper retaining ring 7 is threaded onto the large diameter of the inner wall of the upper sliding sleeve 4, so that the upper straightening tube 5 cannot be dislodged. The inner diameter of the upper straightening tube 5 is smaller than the small diameter of the inner wall of the upper sliding sleeve 4. The inner diameter of the upper straightening tube 5 is smaller than the inner diameter of the upper retaining ring 7, so that the logging cable 1 only contacts the upper straightening tube 5.

[0062] The inner wall of the sliding sleeve 32 consists of a small diameter, a medium diameter, and a large diameter from top to bottom. The middle diameter of the inner wall of the sliding sleeve 32 is fitted with a lower centralizing tube 12. The large diameter of the inner wall of the sliding sleeve 32 is threadedly connected to a lower retaining ring 13, preventing the lower centralizing tube 12 from coming out. The inner diameter of the lower centralizing tube 12 is smaller than the small diameter of the inner wall of the sliding sleeve 32, and the inner diameter of the lower centralizing tube 12 is smaller than the inner diameter of the lower retaining ring 13, so that the logging cable 1 only contacts the lower centralizing tube 12.

[0063] The inner wall of the support 28 has a small diameter, a medium diameter, and a large diameter from top to bottom. An isolation and straightening tube 29 is fitted onto the medium diameter of the inner wall of the support 28. An isolation retaining ring 30 is threaded onto the large diameter of the inner wall of the support 28 to prevent the isolation and straightening tube 29 from coming out. The inner diameter of the isolation and straightening tube 29 is smaller than the small diameter of the inner wall of the support 28 and smaller than the inner diameter of the isolation retaining ring 30, so that only one logging cable is in contact with the isolation and straightening tube 29.

[0064] Furthermore, the lower end of the seat 15 is threadedly connected to the centering seat 16 and sealed by a sealing ring. The centering seat 16 has a small diameter, a medium diameter, and a large diameter from top to bottom. The medium diameter of the centering seat 16 is fitted with a center centering tube 17. The large diameter of the centering seat 16 is threadedly connected to a center retaining ring 18, so that the center centering tube 17 cannot be removed. The inner diameter of the center centering tube 17 is smaller than the small diameter of the centering seat 16 and smaller than the inner diameter of the center retaining ring 18, so that the logging cable 1 only contacts the center centering tube 17.

[0065] Specifically, the upper straightening tube 5, lower straightening tube 12, middle straightening tube 17, and isolation straightening tube 29 are made of copper, which is soft and will not damage the logging cable 1. They play a protective and straightening role for the logging cable 1 and improve the life of the logging cable 1.

[0066] Example 4:

[0067] Based on Embodiment 3, this embodiment provides a rotary sealing mechanism, wherein the upper sealing body 10 and the lower sealing body 26 are connected by the rotary sealing mechanism.

[0068] The rotary sealing mechanism includes an upper suspension sleeve 20, a lower suspension sleeve 21, and an adapter 22. The upper end of the upper suspension sleeve 20 is connected to the lower end of the upper sealing body 10, and the lower end of the adapter 22 is connected to the upper end of the lower sealing body 26. An inner locking ring is provided on the outer wall of the upper suspension sleeve 20, and an outer locking ring is provided on the inner wall of the lower suspension sleeve 21. The lower suspension sleeve 21 is fitted onto the outer wall of the upper suspension sleeve 20, and the outer locking ring is located above the inner locking ring. The upper suspension sleeve 20 is inserted into the adapter 22 and sealed by a sealing ring. The upper suspension sleeve 20 and the adapter 22 can rotate relative to each other. The inner wall of the lower suspension sleeve 21 is threadedly connected to the adapter 22. The upper suspension sleeve 20 and the adapter 22 are locked by tightening the lower suspension sleeve 21.

[0069] When it is necessary to rotate the logging cable 1, loosen the suspension sleeve 21 so that the upper sealing body 10 rotates together with the logging cable 1, reducing the wear of the upper stabilizer 5, upper seal 8, lower stabilizer 12, lower seal 14, and middle stabilizer 17. After rotation is complete, tighten the lower suspension sleeve 21.

[0070] Specifically, the upper suspension sleeve 20 and the upper sealing body 10 are connected by an upper connecting sleeve 19. The upper inner wall of the upper connecting sleeve 19 is threadedly connected to the lower outer wall of the upper sealing body 10 and sealed by a sealing ring. The lower inner wall of the upper connecting sleeve 19 is threadedly connected to the upper outer wall of the upper suspension sleeve 20 and sealed by a sealing ring.

[0071] Specifically, the adapter 22 and the lower sealing body 26 are connected by an isolation tube 24. The upper inner wall of the isolation tube 24 is threadedly connected to the lower outer wall of the adapter 22 and sealed by a sealing ring. The lower outer wall of the isolation tube 24 is threadedly connected to the upper inner wall of the lower sealing body 26 and sealed by a sealing ring.

[0072] The hydraulic oil injected into the downward sealing body 26 reaches the isolation pipe 24 and can isolate the well fluid from the upper sealing mechanism, the lower sealing mechanism, and the slip mechanism, so that the upper sealing mechanism, the lower sealing mechanism, and the slip mechanism 2 will not be corroded by CO2 gas in the well fluid.

[0073] Specifically, a lifting ring 23 is welded to the outer wall of the isolation pipe 24 to facilitate its hoisting to the wellhead and installation on the blowout preventer.

[0074] In use, this utility model is installed on the test blowout preventer of the self-flowing well. The lower end of the test cable 1 is connected to the test instrument, and the upper end of the test cable 1 is connected to the test vehicle. The test cable 1 passes through this utility model.

[0075] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field. They can be directly applied and will not be elaborated further.

[0076] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0077] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0078] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0079] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An anticorrosion test instrument wellhead blowout preventer, comprising an upper sealing body, characterized in that, The upper sealing body is provided with an upper sealing mechanism and a lower sealing mechanism. The upper sealing body is also provided with an upper injection mechanism for applying pressure to the upper sealing mechanism and the lower sealing mechanism. The upper sealing mechanism includes an upper pressure component, a pressure cap, an upper sealing component, and a seat pad; The upper sealing body has an upward positioning step on its upper inner wall. The seat cushion is placed on the upper positioning step, the upper sealing element is placed on the seat cushion, the upper pressing element is placed on the upper sealing element, and the pressure cap is connected to the upper outer wall of the upper sealing body. The pressure cap presses the upper pressing element and the upper sealing element together. The lower sealing mechanism includes a lower pressure transmission component, a lower sealing component, and a seat connector; The seat joint is connected to the lower inner wall of the lower sealing body, the lower sealing element is placed on the seat joint, and the inner wall of the lower sealing body is provided with a downward positioning step above the lower sealing element. The lower pressure transmission element is slidably locked between the lower positioning step and the lower sealing element. The upper injection mechanism includes an upper injection tube; The upper sealing body has a radial connecting hole and a side wall connecting hole on its side wall. The radial connecting hole is spatially connected to the sealing sleeve and the lower sliding sleeve. The radial connecting hole is spatially connected to the gland and the upper sliding sleeve through the side wall connecting hole. The upper injection pipe is sealed to the radial connecting hole. The injection port of the upper injection pipe is equipped with an upper check valve.

2. The anticorrosive test instrument wellhead blowout preventer according to claim 1, characterized in that, The uploading pressure component includes an upper sliding sleeve, the outer wall of which has a small upper diameter and a large lower diameter. The small diameter of the outer wall of the upper sliding sleeve mates with the inner wall of the pressure cap, and the large diameter of the outer wall of the upper sliding sleeve mates with the inner wall of the upper sealing body. The pressure transmission component includes a sealing sleeve and a sliding sleeve; The outer wall of the sliding sleeve has a small diameter at the top and a large diameter at the bottom. The small diameter of the outer wall of the sliding sleeve matches the inner wall of the sealing sleeve, and the large diameter of the outer wall of the sliding sleeve matches the inner wall of the upper sealing body. The outer wall of the sealing sleeve mates with the inner wall of the upper sealing body, and the upper end of the sealing sleeve is positioned with the lower positioning step.

3. The wellhead blowout preventer for corrosion-resistant testing instruments according to claim 1, characterized in that, The upper end of the pressure cap is connected to the slip seat, and the slip seat contains a slip mechanism that can hold the cable. The lower inner wall of the seat joint is connected to the straightening seat.

4. The anticorrosive test instrument wellhead blowout preventer according to claim 1, characterized in that, It also includes a lower sealing body, the upper end of which is connected to the lower end of the upper sealing body. A pressure-isolating sealing mechanism is provided inside the lower sealing body, and a lower injection mechanism is provided inside the lower sealing body for applying pressure to the pressure-isolating sealing mechanism.

5. The anticorrosive test instrument wellhead blowout preventer according to claim 4, characterized in that, The pressure-isolating sealing mechanism includes a pressure ring, a pressure-isolating sealing element, and a support. The support is connected to the lower inner wall of the lower sealing body, the pressure-isolating seal is placed on the support, and the lower inner wall of the lower sealing body is provided with a downward pressure-isolating step above the support. The pressure ring is located between the pressure-isolating seal and the pressure-isolating step. The lower injection mechanism includes a lower injection tube; The lower sealing body is provided with a radial injection hole, which communicates with the space above the pressure ring. The lower injection pipe is connected to the radial injection hole, and the injection port of the lower injection pipe is provided with a lower check valve.

6. The anticorrosive test instrument wellhead blowout preventer according to claim 4, characterized in that, It also includes a rotary sealing mechanism, through which the upper sealing body and the lower sealing body are connected.

7. An anticorrosive test instrument wellhead blowout preventer according to claim 6, characterized in that, The rotary sealing mechanism includes an upper suspension sleeve, a lower suspension sleeve, and an adapter; The upper end of the upper suspension sleeve is connected to the lower end of the upper sealing body, and the lower end of the adapter is connected to the upper end of the lower sealing body. An inner locking ring is provided on the outer wall of the upper suspension sleeve, and an outer locking ring is provided on the inner wall of the lower suspension sleeve. The lower suspension sleeve is fitted onto the outer wall of the upper suspension sleeve, and the outer locking ring is located above the inner locking ring. The upper suspension sleeve is sealed and inserted into the adapter. The upper suspension sleeve and the adapter can rotate relative to each other, and the upper end of the lower suspension sleeve is connected to the lower end of the adapter.

8. An anticorrosive test instrument wellhead blowout preventer according to claim 7, characterized in that, The upper suspension sleeve is connected to the upper sealing body via an upper connecting sleeve, and the adapter is connected to the lower sealing body via an isolation pipe.

9. A wellhead blowout preventer for corrosion-resistant testing instruments according to claim 8, characterized in that, The outer wall of the isolation pipe is connected to a lifting ring.

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