175MPa ultrahigh-pressure high-sulfur-resistance casing head

Abstract

The invention relates to the technical field of casing heads, in particular to a 175MPa ultrahigh-pressure high-sulfur-resistance casing head which comprises a casing head body installed on a well mouth base. The first fixing assembly is mounted on the casing head body and is matched with the wellhead base to fix the casing head body; the second fixing assembly is also installed on the casing head body and connected with the first fixing assembly, the second fixing assembly is driven by the first fixing assembly to move, and the second fixing assembly is matched with the wellhead base to fix the casing head body; when the casing head body is installed, the casing head body is positioned on the well mouth base through cooperation of the connecting channel and the guide connecting column, then multiple locking of the casing head body can be achieved by pushing the first batten, fixed installation of the casing head body is completed, meanwhile, automatic locking of the first batten can be achieved, and the casing head body is convenient to install. The installation firmness and stability of the casing head body are guaranteed, and operation is easy, convenient and fast.

Description

Technical Field

[0001] This invention relates to the field of casing head technology, specifically a 175MPa ultra-high pressure, high sulfur-resistant casing head. Background Technology

[0002] The 175MPa ultra-high pressure, high sulfur-resistant casing head is a key component in drilling and completion engineering. During use, the casing head needs to be fixedly installed on the wellhead base. This is typically achieved by connecting the flange on the casing head to the flange on the wellhead base. While flange connections ensure the casing head's secure and stable installation, they are cumbersome to install and remove. This is because flange connections require workers to tighten multiple bolts one by one, a time-consuming process. Furthermore, when the casing head is damaged, the seal fails, it needs upgrading, or the wellhead equipment is replaced, disassembly is required. Disassembly also necessitates loosening the bolts on the flange, hindering convenient and quick installation and removal, resulting in low efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a 175MPa ultra-high pressure, high sulfur-resistant bushing head to solve the problem mentioned in the background art that existing bushing heads cannot achieve convenient and quick installation and removal.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A 175MPa ultra-high pressure, high sulfur resistance casing head includes: a casing head body, wherein the casing head body is installed on a wellhead base; The first fixing component is installed on the casing head body and cooperates with the wellhead base to fix the casing head body. The second fixing component is also installed on the casing head body and connected to the first fixing component. The first fixing component drives the second fixing component to move, and cooperates with the wellhead base to fix the casing head body. The third fixing component is connected to the second fixing component. The second fixing component drives the third fixing component to move and cooperate with the wellhead base to fix the casing head body. At the same time, the third fixing component locks the first fixing component.

[0005] Furthermore, the first fixing component includes: a first strip plate, which is movably mounted on the sleeve head body; Two movable support bars are movably connected to the first plate, and the first plate drives the movable support bars to move.

[0006] Furthermore, movable insert plates are symmetrically installed on the first plate, and a locking strip is fixedly provided on the movable insert plate. The first plate is locked by the cooperation of the locking strip with the third fixing component.

[0007] Furthermore, a locking block is fixedly installed on the movable support bar, and the locking block cooperates with the wellhead base to fix the casing head body.

[0008] Furthermore, the second fixing component is a second plate, which is movably connected to a movable support strip, and the movable support strip drives the second plate to move.

[0009] Furthermore, a first support rod is symmetrically fixedly arranged on the first plate, a connecting plate is fixedly arranged on the first support rod, and a sealing half-sleeve is fixedly arranged on the connecting plate.

[0010] Furthermore, a second support rod is symmetrically fixedly installed on the second plate, and a sealing half-sleeve is also fixedly installed on the second support rod.

[0011] Furthermore, when the first plate and the second plate fix the sleeve head body, the sealing half-sleeve on the first plate and the sealing half-sleeve on the second plate close together.

[0012] Furthermore, the third fixing component is a movable locking strip, and there are two movable locking strips, which are movably connected to the second strip respectively, and the movable locking strips are moved by the second strip.

[0013] Furthermore, movable locking pins are symmetrically fixed at both ends of the movable locking plate, and the casing head body is fixed by the cooperation of the movable locking pins with the wellhead base.

[0014] Furthermore, a support vertical plate is fixedly provided at the lower end of one end of the movable locking plate, and a limiting channel is opened on the support vertical plate. The first plate is fixed by the cooperation of the limiting channel and the locking bar.

[0015] Compared with the prior art, the beneficial effects of the present invention are: the present invention has a reasonable structural design and strong functionality, and has the following advantages: 1. When installing the casing head body, the casing head body is positioned on the wellhead base by cooperating with the connecting channel and the guide column. Then, pushing the first plate can achieve multiple locking of the casing head body, completing the fixed installation of the casing head body. At the same time, it can realize the automatic locking of the first plate, ensuring the firmness and stability of the casing head body installation. The operation is simple, convenient and quick, and can realize the convenient installation and fixation of the casing head body.

[0016] 2. When the first plate moves, it can drive the movable support bar to move as well. With the cooperation of the movable support bar and the wellhead base, it can fix the casing head body. At the same time, the movable support bar can drive the second plate to move. With the cooperation of the second plate and the first plate, it can not only fix the casing head body but also seal the connection channel.

[0017] 3. In addition, the movement of the second plate can also drive the movable locking plate to move, which can further fix the sleeve head body under the action of the movable locking plate, providing a strong guarantee for the fixed installation of the sleeve head body. When disassembling the sleeve head body, pulling the movable insert plate can unlock the first plate, making it easy to quickly disassemble the sleeve head body. Attached Figure Description

[0018] Figure 1 This is a first-view schematic diagram of the assembly of the casing head body and the wellhead base.

[0019] Figure 2 This is a second-view schematic diagram of the assembly of the casing head body and the wellhead base.

[0020] Figure 3 This is a schematic diagram of the assembly of the sleeve head body.

[0021] Figure 4 This is a first-view structural diagram of the casing head body.

[0022] Figure 5 This is a schematic diagram of the second-view structure of the casing head body.

[0023] Figure 6 This is a schematic diagram of the wellhead base.

[0024] Figure 7 A first-view schematic diagram of the assembly of the first plate, the movable support strip, the second plate, and the movable locking plate.

[0025] Figure 8 A second-view schematic diagram of the assembly of the first plate, the movable support strip, the second plate, and the movable locking plate.

[0026] Figure 9 This is a schematic diagram showing the fit between the first and second plates.

[0027] Figure 10 This is a schematic diagram of the assembly of the first plate and the movable support strip.

[0028] Figure 11 This is an assembly diagram of the second plate and the movable locking plate.

[0029] In the diagram: 1. Casing head body; 11. Body base; 12. Mounting plate; 13. Movable insertion hole; 14. Support mating plate; 15. Guide rod; 16. Connecting mating post; 161. Connecting channel; 162. Mating ring groove; 17. Mounting insertion hole; 18. Sealing ring; 181. Outer sealing ring; 182. First wedge surface; 19. Inner sealing ring; 191. Second wedge surface; 2. Wellhead base; 21. Sealing ring groove; 22. Outer mating ring; 23. Third wedge surface; 24. Inner mating ring; 25. Fourth wedge surface; 26. First support frame; 27. Insertion lock channel; 28. Second support frame; 281. Mating lock channel; 29. ​​Guide connecting post; 291. Connecting ring groove; 3. First strip plate; 31. Mounting cavity. 32. Connecting through hole; 33. Movable insert plate; 34. Matching lock bar; 35. First spring; 36. First support rod; 37. Connecting bearing plate; 371. Connecting bearing bar; 372. Connecting bearing column; 38. Second spring; 39. Sealing half sleeve; 391. First insert ring; 392. Second insert ring; 393. Sealing gasket; 4. Movable bearing bar; 41. Installing insert rod; 42. Connecting frame; 43. Matching lock block; 44. Matching upright block; 45. First connecting rod; 5. Second strip plate; 51. Matching connecting block; 52. Second support rod; 53. Connecting bearing block; 54. Second connecting rod; 6. Movable locking plate strip; 61. Movable locking column; 62. Guide through hole; 63. Support vertical plate; 64. Limiting channel; 65. Lower plate. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] This invention provides a technical solution: like Figure 1 , Figure 2 , Figure 7 and Figure 8As shown, a 175MPa ultra-high pressure, high sulfur-resistant casing head includes: a casing head body 1, a first fixing component, a second fixing component, and a third fixing component. The casing head body 1 is mounted on a wellhead base 2, which supports the casing head body 1. The first fixing component is mounted on the casing head body 1 and cooperates with the wellhead base 2 to fix the casing head body 1. The second fixing component is also mounted on the casing head body 1 and connected to the first fixing component. The first fixing component drives the second fixing component to move, cooperating with the wellhead base 2 to fix the casing head body 1. The third fixing component is connected to the second fixing component. The components are connected, and the second fixing component drives the third fixing component to move and cooperate with the wellhead base 2 to fix the casing head body 1. At the same time, the third fixing component locks the first fixing component. Under the combined action of the first fixing component, the second fixing component and the third fixing component, the casing head body 1 can play a multiple locking role to ensure its installation firmness. In addition, locking the first fixing component with the third fixing component can ensure the stability of the casing head body 1 installation. Moreover, locking the first fixing component by moving the third fixing component does not require additional locking operation, which is very convenient.

[0032] like Figure 4 and Figure 5 As shown, the lower end of the sleeve head body 1 is welded and fixed to the body base 11 by welding process. The two sides of the body base 11 are symmetrically welded and fixed to the mounting plate 12 by welding process. The mounting plate 12 is symmetrically provided with movable insertion holes 13. The upper two ends of the mounting plate 12 are symmetrically integrally formed and fixed with support mating plates 14. The support mating plates 14 are welded and fixed to the guide support rods 15 by welding process. The two ends of the body base 11 are symmetrically welded and fixed with connecting mating columns 16. The connecting mating columns 16 are provided with connecting channels 161, which penetrate the body base 11. The connecting mating columns 16 are also provided with mating ring grooves 162.

[0033] In addition, mounting holes 17 are symmetrically provided at both ends of the main body base 11. A sealing ring 18 is integrally formed and fixed at the lower end of the main body base 11. The surface of the sealing ring 18 is smooth and burr-free. An outer sealing ring 181 is integrally formed and fixed on the outer side of the sealing ring 18, and an inner sealing ring 19 is integrally formed and fixed on the inner side of the sealing ring 18. A first wedge-shaped surface 182 is provided on the outer sealing ring 181, and a second wedge-shaped surface 191 is provided on the inner sealing ring 19.

[0034] like Figure 2 and Figure 6As shown, a sealing ring groove 21 is provided on the wellhead base 2. The inner wall of the sealing ring groove 21 is smooth and burr-free. An outer mating ring 22 is integrally formed and fixed in the sealing ring groove 21. A third wedge-shaped surface 23 is provided on the outer mating ring 22. An inner mating ring 24 is also integrally formed and fixed in the sealing ring groove 21. A fourth wedge-shaped surface 25 is provided on the inner mating ring 24. A first support frame 26 is symmetrically welded and fixed on both sides of the wellhead base 2. An insertion lock channel 27 is symmetrically provided on the first support frame 26. A second support frame 28 is symmetrically welded and fixed at both ends of the wellhead base 2. A mating lock channel 281 is provided on the second support frame 28. Guide connecting columns 29 are symmetrically welded and fixed at both ends of the upper end face of the wellhead base 2. A connecting ring groove 291 is provided on the guide connecting column 29. When the casing head body 1 is installed on the wellhead base 2, the guide connecting column 29 is inserted into the connecting channel 161.

[0035] In addition, when the casing head body 1 is installed on the wellhead base 2, the sealing ring 18 is inserted into the sealing ring groove 21. The sealing ring 18 and the sealing ring groove 21 cooperate to seal the connection between the casing head body 1 and the wellhead base 2. At this time, the outer sealing ring 181 overlaps the outer mating ring 22, the first wedge surface 182 and the third wedge surface 23 are in contact and cooperate, the inner sealing ring 19 overlaps the inner mating ring 24, and the second wedge surface 191 and the fourth wedge surface 25 cooperate. In this way, under the action of the casing head body 1's own weight, the wedge surfaces are tightly squeezed and contacted together, further improving the sealing performance between the casing head body 1 and the wellhead base 2.

[0036] like Figure 3 , Figure 7 , Figure 8 and Figure 10 As shown, the first fixing component includes a first plate 3 and a movable support bar 4. The first plate 3 is movably installed on the sleeve head body 1. Specifically, a first support rod 36 is symmetrically welded and fixed on the first plate 3 by welding process. The first support rod 36 is inserted into the movable insertion hole 13 on one side of the sleeve head body 1. The first plate 3 is movably installed on the sleeve head body 1 by the cooperation between the first support rod 36 and the movable insertion hole 13. A connecting support plate 37 is welded and fixed on the end of the first support rod 36 away from the first plate 3 by welding process.

[0037] A connecting support strip 371 is integrally formed and fixed on the connecting support plate 37. A connecting support column 372 is welded and fixed at the lower end of the connecting support strip 371 by welding process. The surface of the connecting support column 372 is smooth and burr-free. In addition, a second spring 38 is sleeved on the first support rod 36. The two ends of the second spring 38 are welded and fixed to the connecting support plate 37 and the mounting support plate 12 on which the first plate 3 is installed, respectively.

[0038] A sealing half-sleeve 39 is also welded and fixed on the connecting plate 37 by welding process. A first insert ring 391 is integrally formed and fixed inside the sealing half-sleeve 39, and a second insert ring 392 is integrally formed and fixed in the sealing half-sleeve 39 below the first insert ring 391. In addition, a sealing gasket 393 is attached to the sealing half-sleeve 39. When the sealing half-sleeve 39 plays a role in fixing the sleeve head body 1, the first insert ring 391 is inserted into the connecting ring groove 291 on the guide connecting column 29, and the second insert ring 392 is inserted into the mating ring groove 162 on the connecting mating column 16.

[0039] There are two movable support bars 4, which are respectively installed at both ends of the sleeve head body 1 and are movably connected to the first plate 3. The movable support bars 4 are moved by the first plate 3. Specifically, an installation rod 41 is welded and fixed on the movable support bar 4 by welding process. The installation rod 41 is inserted into the installation hole 17. A connecting frame 42 is welded and fixed on the upper end of the movable support bar 4 by welding process. The inner wall of the connecting frame 42 is smooth and burr-free. A connecting column 372 is inserted into the connecting frame 42. The connecting column 372 is in contact with the inner wall of the connecting frame 42. The movable connection between the movable support bar 4 and the first plate 3 is realized by the cooperation of the connecting column 372 and the connecting frame 42.

[0040] like Figure 9 As shown, the first plate 3 has an installation cavity 31, and the installation cavity 31 has symmetrically arranged connecting through holes 32. The installation cavity 31 has symmetrically arranged movable insert plates 33, which are partially inserted into the installation cavity 31. The movable insert plates 33 are fixedly welded to the movable insert plates 33 by welding process. The locking strips 34 are inserted into the connecting through holes 32. The locking strips 34 are sleeved on the locking strips 34. The first spring 35 is located in the installation cavity 31, and the two ends of the first spring 35 are respectively welded and fixed to the movable insert plates 33 and the inner wall of the installation cavity 31.

[0041] In addition, the first plate 3 is locked by cooperating with the locking bar 34 and the third fixing component.

[0042] The movable support bar 4 is integrally formed and fixedly provided with a mating locking block 43. The surface of the mating locking block 43 is smooth and burr-free. The mating locking block 43 cooperates with the second support frame 28 on the wellhead base 2 to fix the casing head body 1. That is, when the mating locking block 43 fixes the casing head body 1, the mating locking block 43 is inserted into the mating locking channel 281 on the second support frame 28, and the mating locking block 43 is in contact with the inner wall of the mating locking channel 281. In addition, a mating upright block 44 is welded and fixed at the upper end of the movable support bar 4 away from the connecting frame 42 by welding process.

[0043] like Figure 2 and Figure 11As shown, the second fixing component is the second plate 5. The second support rod 52 is symmetrically welded and fixed on the second plate 5 by welding process. The second support rod 52 is inserted into the movable insertion hole 13 on the other side of the sleeve head body 1. The second plate 5 is installed on the sleeve head body 1 by the cooperation of the second support rod 52 and the movable insertion hole 13. The end of the second support rod 52 away from the second plate 5 is also welded and fixed with a sealing half sleeve 39 by welding process.

[0044] In addition, a first connecting rod 45 is hinged to the supporting block 44, and a matching connecting block 51 is symmetrically welded and fixed at both ends of the second plate 5 through a welding process. The matching connecting block 51 is hinged to the other end of the first connecting rod 45. The first connecting rod 45 realizes the movable connection between the second plate 5 and the movable support bar 4. Thus, when the movable support bar 4 moves, the second plate 5 can be moved by the first connecting rod 45.

[0045] When the first plate 3 and the second plate 5 fix the sleeve head body 1, the sealing half sleeve 39 on the first plate 3 and the sealing half sleeve 39 on the second plate 5 are closed together. At this time, the two sealing half sleeves 39 are both sleeved on the connecting mating post 16 and the guide connecting post 29, and the sealing gaskets 393 on the two sealing half sleeves 39 are tightly pressed together to ensure the sealing of the connection between the two sealing half sleeves 39. At the same time, when the sealing half sleeves 39 are closed, they can seal the connecting channel 161, thereby sealing the connecting channel 161.

[0046] like Figure 2 , Figure 3 , Figure 7 , Figure 8 and Figure 11 As shown, the third fixing component is a movable locking plate 6, of which there are two. Symmetrically, guide holes 62 are provided on the movable locking plate 6, and guide rods 15 are inserted into the guide holes 62. The cooperation between the guide holes 62 and the guide rods 15 limits the movement of the movable locking plate 6, allowing it to move only along the guide rods 15. A pendant plate 65 is integrally formed and fixedly installed on the lower end of one end of each movable locking plate 6 near the second plate 5. A connecting block 53 is integrally formed and fixedly installed on the second plate 5. A second connecting rod 54 is symmetrically hinged to the connecting block 53. The other end of the second connecting rod 54 is hinged to the pendant plate 65 on the movable locking plate 6. The second connecting rod 54 enables the movable connection between the movable locking plate 6 and the second plate 5. Therefore, when the second plate 5 moves, the movable locking plate 6 can be moved by the second connecting rod 54.

[0047] The two ends of the movable locking strip 6 are symmetrically welded and fixed with movable locking pins 61. The surface of the movable locking pins 61 is smooth and burr-free. The movable locking pins 61 and the wellhead base 2 cooperate to fix the casing head body 1. That is, when the movable locking pins 61 lock the casing head body 1, the movable locking pins 61 are inserted into the insertion locking channel 27 on the first support 26. The casing head body 1 is fixed by the cooperation between the movable locking pins 61 and the insertion locking channel 27.

[0048] A support vertical plate 63 is welded and fixed to the lower end of the movable locking plate 6 near the first plate 3 by welding. A limit channel 64 is opened on the support vertical plate 63. The first plate 3 is fixed by the cooperation of the limit channel 64 and the mating locking bar 34. That is, when the mating locking bar 34 is inserted into the limit channel 64, the mating locking bar 34 is in contact with the support vertical plate 63.

[0049] During the installation of the sleeve head body 1, the guide pin 29 is inserted into the connecting channel 161, and the sleeve head body 1 is positioned by the cooperation between the guide pin 29 and the connecting channel 161.

[0050] Once the sleeve head body 1 is positioned, the sleeve head body 1 can be fixed by pushing the first plate 3 towards the connecting mating post 16, thereby putting the second spring 38 in a stretched state. As the first plate 3 moves, the movable bearing strip 4 will move away from the body base 11 under the cooperation of the connecting frame 42 and the connecting bearing post 372. As the movable bearing strip 4 moves, the mating locking block 43 on the movable bearing strip 4 will be inserted into the mating locking channel 281 on the second support 28, thereby fixing the sleeve head body 1.

[0051] When the movable support bar 4 moves away from the base 11, the first connecting rod 45 will cause the second plate 5 to move towards the connecting mating post 16. This will cause the sealing half-sleeve 39 on the second plate 5 to engage with the connecting mating post 16 and the guide connecting post 29. Specifically, at this time, the first insert ring 391 of the sealing half-sleeve 39 on the second plate 5 is inserted into the connecting ring groove 291 on the guide connecting post 29, and the second insert ring 392 is inserted into the mating ring groove 162 on the connecting mating post 16. The movement of the first plate 3 towards the connecting mating post 16 will also cause... The first insert ring 391 of the sealing half-sleeve 39 on the first plate 3 is inserted into the connecting ring groove 291 on the guide column 29, and the second insert ring 392 is inserted into the mating ring groove 162 on the connecting mating column 16. Finally, the sealing half-sleeves 39 on the first plate 3 and the second plate 5 are closed together and tightly squeezed together, so that the sealing gasket 393 is in a compressed state. That is, at this time, the sealing gaskets 393 on the two sealing half-sleeves 39 are in contact. In this way, the sealing half-sleeves 39, the connecting mating column 16 and the guide column 29 can fix the sleeve head body 1.

[0052] In addition, when the second plate 5 moves toward the connecting and mating post 16, the two movable locking plates 6 will move toward each other under the action of the second connecting rod 54, that is, the two movable locking plates 6 will move toward the first support 26. As the movable locking plates 6 move, the movable locking post 61 on the movable locking plate 6 will be inserted into the insertion locking channel 27 on the first support 26. The cooperation between the movable locking post 61 and the insertion locking channel 27 can fix the sleeve head body 1.

[0053] Since the locking strip 34 on the first plate 3 is in contact with the supporting vertical plate 63 on the movable locking plate 6, when the movable locking plate 6 moves in opposite directions, it will push the locking strip 34 on the first plate 3, causing it to move further into the installation cavity 31. This will cause the first spring 35 on the locking strip 34 to be in a stretched state. Since the first plate 3 is also moving, as the first plate 3 moves, the locking strip 34 will be aligned with the limiting channel 64 on the movable locking plate 6. At this time, the locking strip 34 will be unrestricted, and the first spring 35 will be in a stretched state. Therefore, under the action of the first spring 35, the locking strip 34 will be driven to move in the opposite direction, so that the locking strip 34 is inserted into the limiting channel 64 on the supporting vertical plate 63. Thus, the locking strip 34 and the limiting channel 64 can fix the first plate 3, thereby completing the fixation of the sleeve head body 1. The operation is very simple, convenient and quick.

[0054] When the casing head body 1 is damaged or the seal fails, and it is necessary to disassemble the casing head body 1, the two movable insert plates 33 are pulled in opposite directions to move the mating locking bar 34 further into the installation cavity 31, so that the mating locking bar 34 exits the limit channel 64. This allows the first plate 3 to be in the unlocked state. Then, under the action of the second spring 38, the first plate 3 can be moved in the opposite direction to reset. As the first plate 3 moves in the opposite direction to reset, it will drive the movable bearing bar 4 to reset, which in turn will drive the second plate 5 and the movable locking bar 6 to reset, thereby realizing the complete unlocking of the casing head body 1, which can be disassembled, making the disassembly of the casing head body 1 more convenient.

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A 175MPa ultra-high pressure, high sulfur-resistant bushing head, characterized in that: include: A casing head body, which is mounted on a wellhead base; The first fixing component is installed on the casing head body and cooperates with the wellhead base to fix the casing head body. The second fixing component is also installed on the casing head body and is connected to the first fixing component. The first fixing component drives the second fixing component to move and cooperate with the wellhead base to fix the casing head body. The third fixing component is connected to the second fixing component. The second fixing component drives the third fixing component to move and cooperate with the wellhead base to fix the casing head body. At the same time, the third fixing component locks the first fixing component.

2. The 175MPa ultra-high pressure, high sulfur-resistant bushing head according to claim 1, characterized in that: The first fixing component includes: a first strip plate, which is movably mounted on the sleeve head body; Two movable support bars are movably connected to the first plate, and the first plate drives the movable support bars to move.

3. The 175MPa ultra-high pressure, high sulfur-resistant bushing head according to claim 2, characterized in that: The first plate is symmetrically equipped with movable insert plates, and the movable insert plates are fixedly provided with matching locking strips. The first plate is locked by the matching locking strips cooperating with the third fixing component.

4. The 175MPa ultra-high pressure, high sulfur-resistant bushing head according to claim 3, characterized in that: A locking block is fixedly installed on the movable support bar, and the locking block cooperates with the wellhead base to fix the casing head body.

5. A 175MPa ultra-high pressure, high sulfur-resistant bushing head according to claim 4, characterized in that: The second fixed component is a second plate, which is movably connected to a movable support strip, and the movable support strip drives the second plate to move.

6. The 175MPa ultra-high pressure, high sulfur-resistant bushing head according to claim 5, characterized in that: A first support rod is symmetrically fixedly arranged on the first plate, a connecting plate is fixedly arranged on the first support rod, and a sealing half-sleeve is fixedly arranged on the connecting plate.

7. A 175MPa ultra-high pressure, high sulfur-resistant bushing head according to claim 6, characterized in that: A second support rod is symmetrically fixedly installed on the second plate, and a sealing half-sleeve is also fixedly installed on the second support rod.

8. A 175MPa ultra-high pressure, high sulfur-resistant bushing head according to claim 7, characterized in that: When the first plate and the second plate fix the sleeve head body, the sealing half-sleeve on the first plate and the sealing half-sleeve on the second plate close together.

9. A 175MPa ultra-high pressure, high sulfur-resistant bushing head according to claim 8, characterized in that: The third fixing component is a movable locking plate, and there are two movable locking plates, which are movably connected to the second plate respectively. The second plate drives the movable locking plates to move.

10. A 175MPa ultra-high pressure, high sulfur-resistant bushing head according to claim 9, characterized in that: The movable locking plate is symmetrically fixed with movable locking pins at both ends. The movable locking pins, in conjunction with the wellhead base, fix the casing head body.

11. A 175MPa ultra-high pressure, high sulfur-resistant bushing head according to claim 10, characterized in that: A support vertical plate is fixedly installed at the lower end of one end of the movable locking plate. A limiting channel is opened on the support vertical plate, and the first plate is fixed by the cooperation of the limiting channel and the locking bar.

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