Casing head and oil gas wellhead integrated device

Abstract

The invention relates to the technical field of wellhead devices, in particular to a casing head and oil gas wellhead integrated device. Comprising two casing heads, the lower end of a connecting pipe of the upper casing head is fixedly and hermetically connected with the upper end of a supporting pipe of the lower casing head through a flange assembly, the supporting pipes of the two casing heads are fixedly communicated with a first pipeline and a second pipeline respectively, and the first pipeline and the second pipeline are provided with a first valve and a second valve respectively. The first pipeline and the second pipeline are communicated with an inlet of the gas separator, and a pressure gauge and a pressure release valve are mounted on the first pipeline. In the installation process of the technical casing, the downward movement of the suspension assembly drives the bristle group to move in a manner of being attached to the inner conical surface, and impurities are automatically brushed away; meanwhile, air between the outer ring and the inner ring is sprayed out through the air holes and blows the inner conical surface, the cleanliness of the inner conical surface is remarkably improved through the dual cleaning effect, the manual cleaning requirement is reduced, and the installation efficiency and reliability are improved.

Description

Technical Field

[0001] This invention relates to the field of wellhead device technology, specifically to an integrated casing head and oil and gas wellhead device. Background Technology

[0002] The casing head, used to fix the wellhead of the drilled well, connects to the wellhead casing string, supports the weight of the technical casing and the oil layer casing, seals the annular space between the casing layers, provides a transition connection for installing blowout preventers, tubing heads, and Christmas trees, and allows for operations such as mud filling, monitoring, and adding balancing fluid through two side ports on the casing head body. Because the casing head assembly takes 4-6 hours to seal, while the cement solidifies within 1-3 hours, high-pressure layer oil and gas have already escaped from the well before the casing head is installed, causing 25% of oil wells to be affected by gas and fluid leakage, impacting production.

[0003] When using a hanger to install a casing, the hanger fits tightly against the sealing surface of the casing head. However, due to the harsh environment of oil extraction, impurities are easily left on the sealing surface of the casing head, affecting the sealing performance between the hanger and the casing head and increasing the possibility of leakage. Therefore, a casing head with a cleaning function is needed to ensure that the cleaning function can be triggered when the hanger is installed, so that the sealing surface is cleaned and the sealing performance between the hanger and the casing head is guaranteed. Summary of the Invention

[0004] The main objective of this invention is to provide an integrated casing head and oil / gas wellhead device that can improve sealing performance.

[0005] To achieve the above objectives, the technical solution provided by this invention is as follows: The sleeve head includes a support tube with an inner conical surface machined inside. The lower end of the support tube is detachably and fixedly sealed to the connecting tube. A suspension assembly is slidably and sealed inside the support tube above the inner conical surface. The suspension assembly includes a hanger with a mounting ring fixedly and sealed on its outer side. The mounting ring has an annular cavity, and a sliding ring is elastically and slidably sealed inside the annular cavity. An inverted L-shaped limiting rod is fixed to the upper end of the sliding ring. The vertical part of the limiting rod is slidably and sealed to the mounting ring, and the horizontal part of the limiting rod is located in a groove at the upper end of the support tube. A fixing ring is concentrically fixed to the lower end of the mounting ring. An inner ring is slidably disposed inside the fixing ring, and an outer ring is slidably disposed outside the fixing ring. Multiple smooth rods are fixed to the upper ends of both the outer and inner rings, with the upper ends of the smooth rods extending into the annular cavity. The lower end of the sliding ring is fixedly connected to the upper end of the sliding ring, and the smooth rod is slidably and sealed to the mounting ring. A first rubber sleeve is concentrically fixed to the lower end of the mounting ring. The first rubber sleeve is located outside the outer ring. A second rubber sleeve is concentrically fixed to the lower end of the first rubber sleeve. Multiple bristle groups are fixed to the outer side of the second rubber sleeve. Multiple air holes are opened on the second rubber sleeve. A lifting component is slidably arranged in the axial direction on the inner side of the inner ring. The lower end of the second rubber sleeve is folded inward and fixedly connected to the lower end of the lifting component. The lower ends of the inner ring and the outer ring are tightly against the inner sidewall of the second rubber sleeve. The bristle group between the lower ends of the inner ring and the outer ring is in contact with the inner conical surface. The lower end of the pull rope is fixedly connected to the upper end of the lifting component. The upper end of the pull rope passes through the rope hole on the inner ring and is fixedly connected to the lower end of the mounting ring.

[0006] Specifically, the diameter of the upper end of the inner conical surface is larger than the diameter of the lower end.

[0007] Specifically, the lower end of the support tube is threaded into the slot at the upper end of the connecting tube, and a sealing ring is fixedly and sealed to the lower end of the support tube, with the sealing ring in sealing contact with the bottom of the slot.

[0008] Specifically, the lower end of the fixing ring is machined with a lower conical surface, which is located above the inner conical surface and is parallel to the inner conical surface.

[0009] Specifically, the lower ends of the inner ring and the outer ring are machined with arc surfaces, the height of the lower end of the outer ring is greater than the height of the lower end of the inner ring, and the second rubber sleeve portion between the lower ends of the inner ring and the lower ends of the outer ring is parallel to the inner conical surface.

[0010] Specifically, the inner ring and the fixed ring are slidably and sealingly connected, and the outer ring and the fixed ring are slidably and sealingly connected.

[0011] Specifically, the lifting assembly includes a connecting ring located inside the inner ring. Multiple vertical grooves are provided on the inner edge of the inner ring. A slider is slidably disposed in the groove. The slider is fixed on the outside of the connecting ring. The lower end of the second rubber sleeve is fixedly connected to the lower end of the connecting ring. The rope hole is inverted L-shaped. The vertical part of the rope hole communicates with the groove. A pull rope is provided on each slider. A clearance groove corresponding to the upper end of the pull rope is provided in the mounting ring inside the inner ring.

[0012] Specifically, the mounting ring has an arc-shaped groove on its outer side, and a rubber sealing sleeve is provided in the groove. The upper and lower ends of the rubber sealing sleeve are fixedly and sealed to the mounting ring. A storage cavity is formed between the rubber sealing sleeve and the groove wall. The storage cavity is connected to the upper end of the ring cavity through a channel. The ring cavity above the slip ring is filled with liquid. The upper end of the slip ring is connected to the mounting ring through a spring.

[0013] An integrated oil and gas wellhead device includes a casing head, which has two positions. The lower end of the connecting pipe of the upper casing head is fixedly and sealed to the upper end of the support pipe of the lower casing head through a flange assembly. The support pipes of the two casing heads are respectively fixedly connected to a first pipe and a second pipe. A first valve and a second valve are respectively installed on the first pipe and the second pipe. The first pipe and the second pipe are connected to the inlet of a gas separator. A pressure gauge and a pressure relief valve are installed on the first pipe.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. During the installation of the technical sleeve, the downward movement of the suspension assembly drives the brush assembly to move in contact with the inner conical surface, automatically brushing away impurities; at the same time, air between the outer ring and the inner ring is ejected through the air hole to blow on the inner conical surface. The dual cleaning effect significantly improves the cleanliness of the inner conical surface, reduces the need for manual cleaning, and improves installation efficiency and reliability.

[0015] 2. The first rubber sleeve is sealed to the inner conical surface, and the expansion design of the rubber sealing sleeve (achieved by liquid compression when the installation ring moves) forms a double dynamic seal; the contact between the sealing ring and the bottom of the slot further enhances the sealing performance, effectively prevents oil and gas leakage, and enhances the stability and safety of the sleeve head under high pressure.

[0016] 3. The side opening design allows for operations such as mud filling, monitoring wellhead pressure, and adding balancing fluid; combined with the linkage of the first valve and the pressure relief valve, it simplifies the daily maintenance process, reduces the complexity of construction, and improves the operability and flexibility of oil and gas extraction.

[0017] 4. The pressure gauge accurately displays the pressure values ​​between each layer of pipes, providing real-time monitoring; the pressure relief valve automatically releases pressure when the pressure is too high to prevent equipment damage; the first valve not only protects the pressure gauge, but also supports operations such as mud replenishment and balance fluid injection, ensuring that the system can achieve pressure balance through the gas separator when there is vibration or poor sealing (such as sand or gas intrusion), thus improving the overall safety redundancy.

[0018] 5. The integrated oil and gas wellhead unit uses two casing head flanges for connection. The first and second pipelines are integrated with the gas separator to achieve oil and gas separation and pressure recovery (e.g., separated gas can be reinjected into the well through the first pipeline to enhance sealing). This design supports the gravity load of multi-level casing and annular space sealing, optimizes wellhead fixing and drilling management, is suitable for complex mining environments, and reduces long-term operation and maintenance costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of an integrated oil and gas wellhead device.

[0020] Figure 2 This is a schematic diagram of the sleeve head.

[0021] Figure 3 This is a schematic diagram showing the connection between the support pipe and the connecting pipe.

[0022] Figure 4 This is a sectional view of the suspension assembly.

[0023] Figure 5 This is a cross-sectional view of the connection structure between the limit rod and the slip ring.

[0024] Figure 6 This is a schematic diagram showing the fit between the fixed ring, inner ring, and outer ring.

[0025] Figure 7 This is a schematic diagram of the second rubber sleeve.

[0026] Figure 8 This is a schematic diagram of the rubber sealing sleeve inside the annular groove.

[0027] Figure 9 This is a schematic diagram of the slip ring inside the annular cavity.

[0028] Figure 10 This is a schematic diagram of the suspension assembly.

[0029] Figure 11 This is a schematic diagram showing the connection between the inner ring, outer ring, and slip ring.

[0030] Figure 12 This is a schematic diagram of the sliding groove on the inner ring.

[0031] The components in the attached diagram are named as follows: 1. Flange; 2. Rubber sealing sleeve; 3. Support pipe; 4. Inner conical surface; 5. Slot; 6. Connecting pipe; 7. Sealing ring; 8. First pipe; 9. First valve; 10. Pressure gauge; 11. Pressure relief valve; 12. Second pipe; 13. Second valve; 14. Gas separator; 15. Groove; 16. Hanger; 17. Mounting ring; 18. Fixing ring; 19. Lower conical surface; 20. Ring cavity; 21. Slip ring; 22. Limiting rod; 23. Outer ring; 24. Inner ring; 25. Smooth rod; 26. First rubber sleeve; 27. Second rubber sleeve; 28. Brush assembly; 29. ​​Air hole; 30. Connecting ring; 31. Slider; 32. Slide groove; 33. Pull rope; 34. Relief groove; 35. Spring; 36. Channel. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0033] like Figures 1-12 As shown, the sleeve head includes a support tube 3, and an inner conical surface 4 is machined inside the support tube 3. The diameter of the upper end of the inner conical surface 4 is larger than the diameter of the lower end. The lower end of the support tube 3 is detachably and securely connected to the connecting tube 6.

[0034] The lower end of the support tube 3 is threaded into the slot 5 at the upper end of the connecting tube 6. The lower end of the support tube 3 is fixedly and sealed with a sealing ring 7, which is in sealing contact with the bottom of the slot 5.

[0035] The support tube 3 above the inner conical surface 4 is equipped with a sliding seal for the suspension assembly.

[0036] The suspension assembly includes a suspension unit 16, and a mounting ring 17 is fixedly sealed on the outside of the suspension unit 16.

[0037] An annular cavity 20 is provided inside the mounting ring 17. A sliding ring 21 is elastically and slidably connected inside the annular cavity 20. An inverted L-shaped limiting rod 22 is fixed at the upper end of the sliding ring 21. The vertical part of the limiting rod 22 is slidably and slidably connected to the mounting ring 17. The horizontal part of the limiting rod 22 is located in the groove 15 at the upper end of the support tube 3.

[0038] A fixing ring 18 is concentrically fixed at the lower end of the mounting ring 17. The lower end of the fixing ring 18 is machined with a lower conical surface 19, which is located above the inner conical surface 4 and is parallel to the inner conical surface 4.

[0039] An inner ring 24 is slidably disposed on the inner side of the fixed ring 18, and an outer ring 23 is slidably disposed on the outer side of the fixed ring 18. The inner ring 24 and the outer ring 23 are slidably and sealingly connected to the fixed ring 18. Multiple smooth rods 25 are fixed to the upper ends of both the outer ring 23 and the inner ring 24. The upper ends of the smooth rods 25 extend into the ring cavity 20 and are fixedly connected to the lower end of the slip ring 21. The smooth rods 25 are slidably and sealingly connected to the mounting ring 17.

[0040] A first rubber sleeve 26 is concentrically fixed at the lower end of the mounting ring 17. The first rubber sleeve 26 is located outside the outer ring 23. A second rubber sleeve 27 is concentrically fixed at the lower end of the first rubber sleeve 26. Multiple bristle groups 28 are fixed outside the second rubber sleeve 27.

[0041] The second rubber sleeve 27 has multiple air holes 29.

[0042] A lifting assembly is slidably provided on the inner side of the inner ring 24 in the axial direction, and the lower end of the second rubber sleeve 27 is folded inward and fixedly connected to the lower end of the lifting assembly.

[0043] The lifting assembly includes a connecting ring 30 located inside the inner ring 24. Multiple vertical grooves 32 are provided on the inner edge of the inner ring 24. A slider 31 is slidably disposed in the groove 32. The slider 31 is fixed to the outside of the connecting ring 30. The lower end of the second rubber sleeve 27 is fixedly connected to the lower end of the connecting ring 30.

[0044] The lower ends of the inner ring 24 and the outer ring 23 are tightly pressed against the inner sidewall of the second rubber sleeve 27. The bristle group 28 between the lower ends of the inner ring 24 and the outer ring 23 is in contact with the inner conical surface 4. The lower end of the pull rope 33 is fixedly connected to the upper end of the lifting assembly. The upper end of the pull rope 33 passes through the rope hole on the inner ring 24 and is fixedly connected to the lower end of the mounting ring 17.

[0045] The rope hole is inverted L-shaped, and the vertical part of the rope hole is connected to the slide groove 32. Each slider 31 is provided with a pull rope 33. The mounting ring 17 on the inner side of the inner ring 24 is provided with a relief groove 34 corresponding to the upper end of the pull rope 33.

[0046] The lower ends of the inner ring 24 and the outer ring 23 are machined with arc surfaces. The height of the lower end of the outer ring 23 is greater than the height of the lower end of the inner ring 24. The second rubber sleeve 27 between the lower ends of the inner ring 24 and the lower ends of the outer ring 23 is parallel to the inner conical surface 4.

[0047] The mounting ring 17 has an arc-shaped groove on its outer side, and a rubber sealing sleeve 2 is installed in the groove. The upper and lower ends of the rubber sealing sleeve 2 are fixedly and sealed to the mounting ring 17. A storage cavity is formed between the rubber sealing sleeve 2 and the groove wall. The storage cavity is connected to the upper end of the ring cavity 20 through a channel 36. The channel 36 is opened in the mounting ring 17. The ring cavity 20 above the slip ring 21 is filled with liquid. The upper end of the slip ring 21 is connected to the mounting ring 17 through a spring 35.

[0048] The technical sleeve is sealed and fixed inside the hanger 16. The technical sleeve pushes the hanger 16 to move downward. The hanger 16 drives the mounting ring 17 to move downward. Because the straight part of the limiting rod 22 is located in the groove 15, the limiting rod 22, slip ring 21, outer ring 23, inner ring 24, and smooth rod 25 do not move during the downward movement of the mounting ring 17.

[0049] Reference Figure 6 and Figure 7 As shown, during the downward movement of the mounting ring 17, the mounting ring 17 will drive the fixing ring 18 to move closer to the inner conical surface 4. The mounting ring 17 will also drive the first rubber sleeve 26 to move downward, and at the same time, the mounting ring 17 will also drive the upper end of the pull rope 33 to move downward. The pull rope 33 will drive the slider 31 and the connecting ring 30 to move upward, and the connecting ring 30 will drive the lower end of the second rubber sleeve 27 to move upward.

[0050] By moving the first rubber sleeve 26 downward and the lower end of the second rubber sleeve 27 upward, with both moving at the same speed, the first rubber sleeve 26 and the second rubber sleeve 27 as a whole can move relative to the outer ring 23 and the inner ring 24. During this process, the length of the second rubber sleeve 27 located inside the inner ring 24 gradually increases, and the second rubber sleeve 27 will drive multiple bristle groups 28 to move together. By having multiple bristle groups 28 move in contact with the inner conical surface 4, impurities on the inner conical surface 4 can be brushed away, achieving the purpose of cleaning the inner conical surface 4.

[0051] As the mounting ring 17 and the fixing ring 18 move downwards, the air between the outer ring 23 and the inner ring 24 is ejected through multiple air holes 29, which in turn blows the inner conical surface 4, further improving the cleaning effect of the inner conical surface 4.

[0052] As the mounting ring 17 moves downward, the slip ring 21 remains stationary. When the mounting ring 17 moves downward, the liquid in the ring cavity 20 can be squeezed into the storage cavity through the channel 36, thereby causing the rubber sealing sleeve 2 to gradually expand. After the rubber sealing sleeve 2 expands, it makes sealing contact with the support tube 3.

[0053] When the first rubber sleeve 26 aligns with the inner conical surface 4, the lower conical surface 19 at the lower end of the fixing ring 18 is sealed to the inner conical surface 4 via the first rubber sleeve 26. At this point, the hanger 16 and the mounting ring 17 can no longer move downwards, and the first rubber sleeve 26 achieves a seal between the suspension assembly and the support tube 3. The rubber sealing sleeve 2 makes sealing contact with the support tube 3, further improving the sealing performance.

[0054] An integrated oil and gas wellhead device includes a casing head. The casing head has two positions. The lower end of the connecting pipe 6 of the upper casing head is fixedly and sealed to the upper end of the support pipe 3 of the lower casing head via a flange assembly. A first pipe 8 and a second pipe 12 are fixedly connected to the support pipes 3 of the two casing heads, respectively. A first valve 9 and a second valve 13 are installed on the first pipe 8 and the second pipe 12, respectively. The first pipe 8 and the second pipe 12 are connected to the inlet of a gas separator 14. A pressure gauge 10 and a pressure relief valve 11 are installed on the first pipe 8.

[0055] A side port with a valve can be installed on the side of the first pipe 8 and the second pipe 12 near the support pipe 3. Construction operations such as mud filling, monitoring and adding balancing fluid can be carried out through the side port.

[0056] Mud is injected from the side opening to form a seal between the two hangers 16 and the first pipe 8 or the second pipe 12. This seal is used to fix the wellhead of the drilled well, support the weight of the technical casing and the oil layer casing, and seal the annular space between each layer of pipe. When the mud at the bottom vibrates due to oil and gas extraction, causing poor sealing between the hangers 16, the first pipe 8, and the second pipe 12, and sand or gas rushes in from the bottom, it can enter the gas separator 14 through the second pipe 12 for separation. The separated gas can re-enter the well through the first pipe 8 to achieve a pressure seal for the hangers 16. When the pressure inside the hangers 16 is too high, the first valve 9 on the first pipe 8 can be closed to release pressure through the pressure relief valve 11.

[0057] Pressure gauge 10 is used to accurately display the pressure value between each layer of pipe, and to measure and indicate the pressure of the instrument above the ambient pressure. The first valve 9 can not only be used to protect pressure gauge 10, but also to perform construction operations such as filling mud and adding balancing fluid. Pressure relief valve 11 is used to protect pressure gauge 10 and maintain the pressure inside the casing head.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sleeve head, comprising a support tube (3), wherein an inner conical surface (4) is machined inside the support tube (3), and the lower end of the support tube (3) is detachably and fixedly sealed to a connecting tube (6), characterized in that, A suspension assembly is slidably sealed inside the support tube (3) above the inner conical surface (4); the suspension assembly includes a hanger (16), a mounting ring (17) is fixedly sealed on the outside of the hanger (16), an annular cavity (20) is opened inside the mounting ring (17), a sliding ring (21) is elastically slidably sealed inside the annular cavity (20), an inverted L-shaped limiting rod (22) is fixed at the upper end of the sliding ring (21), and the vertical part of the limiting rod (22) is slidably sealed to the mounting ring (17) to limit the movement. The straight part of the rod (22) is located in the groove (15) at the upper end of the support tube (3). A fixing ring (18) is concentrically fixed at the lower end of the mounting ring (17). An inner ring (24) is slidably arranged inside the fixing ring (18), and an outer ring (23) is slidably arranged outside the fixing ring (18). Multiple smooth rods (25) are fixed at the upper ends of both the outer ring (23) and the inner ring (24). The upper ends of the smooth rods (25) extend into the ring cavity (20) and are fixedly connected to the lower end of the sliding ring (21). The inner ring (24) is slidably sealed to the mounting ring (17). A first rubber sleeve (26) is concentrically fixed to the lower end of the mounting ring (17). The first rubber sleeve (26) is located outside the outer ring (23). A second rubber sleeve (27) is concentrically fixed to the lower end of the first rubber sleeve (26). Multiple bristle groups (28) are fixed to the outside of the second rubber sleeve (27). Multiple air holes (29) are opened on the second rubber sleeve (27). A lifting assembly is slidably arranged in the axial direction on the inner side of the inner ring (24). The lower end of the second rubber sleeve (27) is folded inward and fixedly connected to the lower end of the lifting assembly. The lower ends of the inner ring (24) and the outer ring (23) are tightly pressed against the inner wall of the second rubber sleeve (27). The bristle group (28) between the lower ends of the inner ring (24) and the outer ring (23) contacts the inner conical surface (4). The lower end of the pull rope (33) is fixedly connected to the upper end of the lifting assembly. The upper end of the pull rope (33) passes through the rope hole on the inner ring (24) and is fixedly connected to the lower end of the mounting ring (17).

2. The sleeve head according to claim 1, characterized in that, The diameter of the upper end of the inner conical surface (4) is greater than the diameter of the lower end.

3. The sleeve head according to claim 1, characterized in that, The lower end of the support tube (3) is threaded into the slot (5) at the upper end of the connecting tube (6). The lower end of the support tube (3) is fixedly and sealed with a sealing ring (7), which is in sealing contact with the bottom of the slot (5).

4. The sleeve head according to claim 1, characterized in that, The lower end of the fixing ring (18) is machined with a lower conical surface (19), which is located above the inner conical surface (4) and is parallel to the inner conical surface (4).

5. The sleeve head according to claim 1, characterized in that, The lower ends of the inner ring (24) and the outer ring (23) are machined with arc surfaces. The height of the lower end of the outer ring (23) is greater than the height of the lower end of the inner ring (24). The second rubber sleeve (27) between the lower ends of the inner ring (24) and the lower ends of the outer ring (23) is parallel to the inner conical surface (4).

6. The sleeve head according to claim 1, characterized in that, The inner ring (24) is slidably sealed to the fixed ring (18), and the outer ring (23) is slidably sealed to the fixed ring (18).

7. The sleeve head according to claim 1, characterized in that, The lifting assembly includes a connecting ring (30) located inside the inner ring (24). Multiple vertical grooves (32) are provided on the inner edge of the inner ring (24). A slider (31) is slidably arranged in the groove (32). The slider (31) is fixed on the outside of the connecting ring (30). The lower end of the second rubber sleeve (27) is fixedly connected to the lower end of the connecting ring (30). The rope hole is inverted L-shaped. The vertical part of the rope hole is connected to the groove (32). A pull rope (33) is provided on each slider (31). A relief groove (34) corresponding to the upper end of the pull rope (33) is provided in the mounting ring (17) inside the inner ring (24).

8. The sleeve head according to claim 1, characterized in that, The mounting ring (17) has an arc-shaped groove on its outer side, and a rubber sealing sleeve (2) is provided in the groove. The upper and lower ends of the rubber sealing sleeve (2) are fixedly and sealed to the mounting ring (17). A storage cavity is formed between the rubber sealing sleeve (2) and the groove wall. The storage cavity is connected to the upper end of the ring cavity (20) through a channel (36). The ring cavity (20) above the slip ring (21) is filled with liquid. The upper end of the slip ring (21) is connected to the mounting ring (17) through a spring (35).

9. An integrated oil and gas wellhead device, characterized in that, Includes the sleeve head as described in any one of claims 1-8.

10. The integrated oil and gas wellhead device according to claim 9, characterized in that, The sleeve head has two positions. The lower end of the connecting pipe (6) of the upper sleeve head is fixedly and sealed to the upper end of the support pipe (3) of the lower sleeve head through a flange (1) assembly. The support pipe (3) of the two sleeve heads is fixedly connected to the first pipe (8) and the second pipe (12). The first pipe (8) and the second pipe (12) are respectively equipped with the first valve (9) and the second valve (13). The first pipe (8) and the second pipe (12) are connected to the inlet of the gas separator (14). The first pipe (8) is equipped with a pressure gauge (10) and a pressure relief valve (11).

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