An easy-to-install self-sealing oil casing head

Abstract

The present invention relates to the technical field of oil casing heads, and discloses an easy-to-install self-sealing oil casing head, comprising a casing head, a connecting column fixedly connected to the end of the casing head, a flange fixedly connected to the end of the connecting column away from the casing head, a connecting pipe provided on the top of the casing head, a wellhead device provided on the bottom of the casing head, and a sealing component provided inside the casing head; the sealing component comprises a fixed tube, the surface of the fixed tube is fixedly connected to the inner wall of the casing head, and the inner wall of the fixed tube is fixedly connected to a support plate. The present invention provides a sealing gasket on the surface of the plug-in tube, and when the wellhead device is inserted into the interior of the casing head, the plug-in tube will extend into the interior of the wellhead device, and at the same time, the sealing gasket on the surface of the plug-in tube will contact the inner wall of the wellhead device, and the plug-in tube will be sealed by the sealing gasket, and the sealing gasket is provided on the inner wall of the wellhead device to prevent the casing head from being squeezed and deformed when installed on the surface of the wellhead device, thereby improving the service life of the sealing gasket.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum casing heads, in particular to an easy-to-install self-sealing petroleum casing head. Background Art

[0002] The oil casing head is one of the core components of the drilling wellhead assembly. It is mainly used to fix the wellhead structure and has multiple functions. It is installed at the top of the casing string, connecting the various layers of casing and the wellhead assembly. Its main functions include suspending the casing weight, sealing the casing annular space, separating different pressure formations, and providing a foundation for the installation of blowout preventers and Christmas trees.

[0003] The casing head is usually installed on the top of the wellhead device by using a screw or a clamp. When the casing head is connected to the wellhead device, a sealing gasket is provided at the connection to achieve sealing, thereby preventing the casing head from leaking during transmission operations. However, the sealing gasket is located at the connection between the wellhead device and the casing head. When the casing head is installed, the sealing gasket will be squeezed, which can easily cause the sealing gasket to be squeezed and deformed. The sealing gasket is prone to breakage when it is in an extruded state for a long time, thereby affecting the sealing effect of the casing head. Summary of the Invention

[0004] The object of the present invention is to provide a self-sealing petroleum casing head that is easy to install, so as to solve the problems raised in the above background technology.

[0005] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] The present invention is an easy-to-install self-sealing petroleum casing head, comprising a casing head, a connecting column fixedly connected to the end of the casing head, a flange fixedly connected to the end of the connecting column away from the casing head, a connecting pipe provided on the top of the casing head, a wellhead device provided on the bottom of the casing head, and a sealing component provided inside the casing head;

[0007] The sealing component includes a fixed tube, the surface of the fixed tube is fixedly connected to the inner wall of the casing head, the inner wall of the fixed tube is fixedly connected to a support plate, the inner wall of the support plate is fixedly connected to a plug-in tube, the surface of the plug-in tube is sleeved with a sealing gasket, the interior of the fixed tube is plugged with a cylindrical gasket, the interior of the casing head is provided with an extrusion component, and the surface of the casing head is provided with a mounting component.

[0008] Furthermore, there are two flanges, which are symmetrically arranged with the sleeve head as the center, and the end of the plug-in tube extends to the outer end of the support plate. There are two sealing gaskets, which are symmetrically arranged with the support plate as the center.

[0009] Furthermore, there are two cylindrical gaskets, which are symmetrically arranged with the support plate as the center. The end of the plug-in tube extends to the interior of the connecting pipe and the wellhead device. The surfaces of the two sealing gaskets are in contact with the inner walls of the connecting pipe and the wellhead device respectively, and the inner walls of the two cylindrical gaskets are in contact with the surfaces of the connecting pipe and the wellhead device respectively.

[0010] Furthermore, the extrusion component includes an arc plate, a sliding groove is provided on the surface of the arc plate, a slide is slidably connected to the inner wall of the sliding groove, an inclined plate is fixedly connected to the surface of the slide, an end of the slide away from the inclined plate is fixedly connected to the arc plate, and an end of the slide close to the arc plate is fixedly connected to the synchronization ring.

[0011] Furthermore, the number of the arc plates is set to eight, and the eight arc plates are arranged into two groups, and the number of each group is set to four. The surface of the arc plate contacts the inner wall of the fixed tube, and the synchronization ring is located at the end of the arc plate away from the slide groove.

[0012] Furthermore, the end of the slide extends to the outer end of the slide, the end of the inclined plate away from the slide is located at the outer end of the slide, the inner wall of the arc plate contacts the surface of the cylindrical gasket, and the four arc plates are arranged with the cylindrical gasket as the center circumference.

[0013] The cam is fixedly mounted on a drive link, and the guide rail is fixedly mounted on the drive link, wherein the guide rail is mounted on a linking plate, the guide rail being fixedly mounted on the drive link, and the guide rail is fixedly mounted on the drive link.

[0014] Furthermore, the limiting plate is located at one end of the casing head close to the flange, and one end of the movable frame away from the limiting plate contacts the surface of the flange. The number of the arc extrusion plates is set to eight.

[0015] Furthermore, the eight arc extrusion plates are arranged into two groups, and each group has four plates. The four arc extrusion plates are arranged around the casing head as the center circumference, and the bent plate extends from one end of the movable frame to the surface of the casing head.

[0016] Furthermore, one end of the triangular plate away from the bent plate extends to the inside of the roller assembly, the surface of the inclined block contacts the inner wall of the groove, and the surface of the inclined block contacts the end of the arc plate.

[0017] The present invention has the following beneficial effects:

[0018] The present invention provides a sealing gasket on the surface of the plug-in tube. When the wellhead device is inserted into the interior of the casing head, the plug-in tube will extend into the interior of the wellhead device. At the same time, the sealing gasket on the surface of the plug-in tube will contact the inner wall of the wellhead device, and it will be sealed by the sealing gasket. The sealing gasket is provided on the inner wall of the wellhead device to avoid the casing head from being squeezed and deformed when it is installed on the surface of the wellhead device, thereby improving the service life of the sealing gasket. A cylindrical gasket is provided at one end of the fixed tube and the wellhead device that is close to each other. The surface of the wellhead device is sealed by the cylindrical gasket, thereby improving the sealing effect of the wellhead device and the casing head. The sealing gasket and the cylindrical gasket cooperate with each other to perform double sealing on the wellhead device, thereby further improving the sealing performance of the casing head after installation.

[0019] After the casing head is installed on the top of the wellhead device, the present invention squeezes the arc plate through the installation component. After the arc plate is squeezed, it pushes the slide plate to slide into the inside of the slide groove. The slide plate drives the inclined plate to move when it moves. After the inclined plate moves to the inside of the slide groove, it squeezes the circular arc plate. After the circular arc plate is subjected to pressure, it squeezes the cylindrical gasket. The cylindrical gasket is tightly fitted to the surface of the wellhead device by pressure, and the sealing of the wellhead device is improved by increasing the fitting pressure of the cylindrical gasket.

[0020] The invention provides a novel method for fixing the casing head on the surface of the wellhead device by twisting the threaded ring and rotating the casing head. The threaded ring rotates on the surface of the casing head by twisting the threaded ring, and the threaded ring drives the roller group to rotate through the linkage plate when rotating. The roller group squeezes the triangular plate during rotation and pushes the triangular plate to move toward the surface of the casing head. The triangular plate pushes the movable frame to slide on the surface of the limit plate through the bent plate when moving. The movable frame pushes the circular arc extrusion plate to squeeze the wellhead device through the fixed plate when moving, and the casing head is fixed to the surface of the wellhead device by pressure. It only needs to twist the threaded ring and rotate to allow the casing head to be installed on the surface of the wellhead device, which improves the convenience of casing head installation. The circular arc extrusion plate is provided on the surface of the circular arc extrusion plate, and the circular arc extrusion plate contacts the surface of the wellhead device through the friction pad. The friction pad improves the contact force between the circular arc extrusion plate and the wellhead device, thereby improving the stability of the circular arc extrusion plate on the casing head installation. The circular arc extrusion plate pushes the inclined block to move when moving, and the inclined block pushes the slide plate to move toward the inside of the slide groove through the arc plate when moving, thereby increasing the contact force between the cylindrical gasket and the wellhead device.

[0021] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the cross-sectional structure of the casing head of the present invention;

[0025] Figure 3 This is a schematic diagram of the overall structure of the sealing component of the present invention;

[0026] Figure 4 This is a schematic diagram of the overall structure of the extruded component of the present invention;

[0027] Figure 5 This is a schematic diagram of the overall structure of the installation components of the present invention;

[0028] Figure 6 For the present invention Figure 5 A magnified schematic diagram of part A in FIG;

[0029] Figure 7 This is another structural schematic diagram of the installation component of the present invention;

[0030] Figure 8 For the present invention Figure 7 An enlarged schematic diagram of part B in FIG.

[0031] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0032] In the figure: 1. casing head; 2. connecting column; 3. flange; 4. connecting pipe; 5. wellhead assembly; 6. sealing component; 7. extrusion component; 8. mounting component; 10. fixed pipe; 11. sealing gasket; 12. plug-in pipe; 13. cylindrical gasket; 14. support plate; 20. arc plate; 21. slide plate; 22. synchronous ring; 23. inclined plate; 24. slide groove; 25. arc plate; 30. arc extrusion plate; 31. friction pad; 32. roller group; 33. threaded ring; 34. push rod; 35. linkage plate; 36. fixed plate; 37. limit plate; 38. movable frame; 39. bent plate; 40. triangle plate; 41. groove; 42. oblique block. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] See also Figures 1-8 As shown, the present invention is an easy-to-install self-sealing petroleum casing head, comprising a casing head 1, a connecting column 2 fixedly connected to the end of the casing head 1, a flange 3 fixedly connected to the end of the connecting column 2 away from the casing head 1, a connecting pipe 4 provided on the top of the casing head 1, a wellhead assembly 5 provided on the bottom of the casing head 1, and a sealing component 6 provided inside the casing head 1;

[0035] The sealing component 6 includes a fixed tube 10, the surface of the fixed tube 10 is fixedly connected to the inner wall of the casing head 1, the inner wall of the fixed tube 10 is fixedly connected to a support plate 14, the inner wall of the support plate 14 is fixedly connected to a plug-in tube 12, the surface of the plug-in tube 12 is sleeved with a sealing gasket 11, and the interior of the fixed tube 10 is inserted with a cylindrical gasket 13. The interior of the casing head 1 is provided with an extrusion component 7, the surface of the casing head 1 is provided with a mounting component 8, and a sealing gasket 11 is provided on the surface of the plug-in tube 12. When the wellhead device 5 is inserted into the interior of the casing head 1, the plug-in tube 12 will extend to the interior of the wellhead device 5, and the sealing gasket 11 on the surface of the plug-in tube 12 will contact the inner wall of the wellhead device 5, and it is sealed by the sealing gasket 11. The sealing gasket 11 is set at the inner wall of the wellhead device 5 to prevent the casing head 1 from being squeezed and deformed when it is installed on the surface of the wellhead device 5.

[0036] There are two flanges 3, which are symmetrically arranged with the casing head 1 as the center. The end of the plug-in tube 12 extends to the outer end of the support plate 14. There are two sealing gaskets 11, which are symmetrically arranged with the support plate 14 as the center. A cylindrical gasket 13 is provided at the end where the fixed tube 10 and the wellhead device 5 are close to each other. The surface of the wellhead device 5 is sealed by the cylindrical gasket 13 to improve the sealing effect between the wellhead device 5 and the casing head 1.

[0037] There are two cylindrical gaskets 13, which are symmetrically arranged with the support plate 14 as the center. The end of the plug-in tube 12 extends to the inside of the connecting pipe 4 and the wellhead device 5. The surfaces of the two sealing gaskets 11 are in contact with the inner walls of the connecting pipe 4 and the wellhead device 5 respectively, and the inner walls of the two cylindrical gaskets 13 are in contact with the surfaces of the connecting pipe 4 and the wellhead device 5 respectively.

[0038] The extrusion component 7 includes an arc plate 20, a slide groove 24 is provided on the surface of the arc plate 20, and a slide plate 21 is slidably connected to the inner wall of the slide groove 24, and an inclined plate 23 is fixedly connected to the surface of the slide plate 21. The end of the slide plate 21 away from the inclined plate 23 is fixedly connected to the arc plate 25, and the end of the slide plate 21 close to the arc plate 25 is fixedly connected to the synchronization ring 22. After the casing head 1 is installed on the top of the wellhead device 5, the arc plate 25 is squeezed by the installation component 8. After the arc plate 25 is squeezed, it pushes the slide plate 21 to slide inside the slide groove 24. When the slide plate 21 moves, it drives the inclined plate 23 to move. After the inclined plate 23 moves to the inside of the slide groove 24, it squeezes the arc plate 20. After the arc plate 20 is subjected to pressure, it squeezes the cylindrical gasket 13, and the cylindrical gasket 13 is tightly fitted to the surface of the wellhead device 5 using pressure.

[0039] There are eight arc plates 20 , which are divided into two groups, each group having four arc plates. The surface of the arc plates 20 contacts the inner wall of the fixed tube 10 , and the synchronizer ring 22 is located at one end of the arc plate 25 away from the slide groove 24 .

[0040] The end of the slide plate 21 extends to the outer end of the slide groove 24, and the end of the inclined plate 23 away from the slide plate 21 is located at the outer end of the slide groove 24. The inner wall of the arc plate 20 contacts the surface of the cylindrical gasket 13, and the four arc plates 20 are arranged with the cylindrical gasket 13 as the center circumference.

[0041] The mounting component 8 includes a threaded ring 33, the inner wall of the threaded ring 33 is threadedly connected to the surface of the casing head 1, a push rod 34 is fixedly connected to the surface of the threaded ring 33, a linkage plate 35 is fixedly connected to the surface of the threaded ring 33, and the end of the linkage plate 35 away from the threaded ring 33 is fixedly connected to the roller group 32, the end of the casing head 1 is fixedly connected to the limiting plate 37, the surface of the limiting plate 37 is slidably connected to the movable frame 38, the upper surface of the movable frame 38 is fixedly connected to the fixed plate 36, the end of the fixed plate 36 away from the movable frame 38 is fixedly connected to the arc extrusion plate 30, the end of the arc extrusion plate 30 away from the fixed plate 36 is fixedly connected to the friction pad 31, the end of the movable frame 38 away from the fixed plate 36 is fixedly connected to the bent plate 39, and the bent plate 39 away from the movable frame One end of the frame 38 is fixedly connected to a triangular plate 40, and a groove 41 is provided inside the casing head 1. The end of the arc extrusion plate 30 is fixedly connected to a bevel block 42. After the casing head 1 is installed on the top of the wellhead device 5, the threaded ring 33 is twisted to rotate on the surface of the casing head 1. When the threaded ring 33 rotates, it drives the roller group 32 to rotate through the linkage plate 35. When the roller group 32 rotates, it squeezes the triangular plate 40 and pushes the triangular plate 40 to move toward the surface of the casing head 1. When the triangular plate 40 moves, it pushes the movable frame 38 to slide on the surface of the limit plate 37 through the bent plate 39. When the movable frame 38 moves, it pushes the arc extrusion plate 30 to squeeze the wellhead device 5 through the fixed plate 36, and fixes the casing head 1 to the surface of the wellhead device 5 by pressure.

[0042] The limiting plate 37 is located at one end of the casing head 1 close to the flange 3 , and one end of the movable frame 38 away from the limiting plate 37 contacts the surface of the flange 3 . There are eight arc extrusion plates 30 .

[0043] The eight arc extrusion plates 30 are arranged in two groups, and the number of each group is four. The four arc extrusion plates 30 are arranged around the casing head 1 as the center circumference. The bent plate 39 extends to the surface of the casing head 1 away from one end of the movable frame 38. A friction pad 31 is provided on the surface of the arc extrusion plate 30. The arc extrusion plate 30 contacts the surface of the wellhead device 5 through the friction pad 31. The friction pad 31 increases the contact force between the arc extrusion plate 30 and the wellhead device 5, thereby improving the stability of the arc extrusion plate 30 in installing the casing head 1.

[0044] One end of the triangular plate 40 away from the bent plate 39 extends to the inside of the roller assembly 32 , and the surface of the inclined block 42 contacts the inner wall of the groove 41 , and the surface of the inclined block 42 contacts the end of the arc plate 25 .

[0045] When in use, a sealing gasket 11 is provided on the surface of the plug-in tube 12. When the wellhead device 5 is inserted into the interior of the casing head 1, the plug-in tube 12 will extend into the interior of the wellhead device 5. At the same time, the sealing gasket 11 on the surface of the plug-in tube 12 will contact the inner wall of the wellhead device 5, and the sealing gasket 11 is used to seal it. The sealing gasket 11 is set on the inner wall of the wellhead device 5 to avoid the casing head 1 being squeezed and deformed when it is installed on the surface of the wellhead device 5, thereby improving the service life of the sealing gasket 11. A cylindrical gasket 13 is provided at one end of the fixed tube 10 and the wellhead device 5 that is close to each other. The surface of the wellhead device 5 is sealed by the cylindrical gasket 13, thereby improving the wellhead device. The sealing effect of the wellhead device 5 and the casing head 1 is improved. The sealing gasket 11 and the cylindrical gasket 13 cooperate with each other to perform double sealing on the wellhead device 5, further improving the sealing performance of the casing head 1 after installation. After the casing head 1 is installed on the top of the wellhead device 5, the arc plate 25 is squeezed by the installation component 8. After the arc plate 25 is squeezed, it pushes the slide plate 21 to slide inside the slide groove 24. When the slide plate 21 moves, it drives the inclined plate 23 to move. After the inclined plate 23 moves to the inside of the slide groove 24, it squeezes the arc plate 20. After the arc plate 20 is under pressure, it squeezes the cylindrical gasket 13. The cylindrical gasket 13 uses pressure to fit tightly to the surface of the wellhead device 5. Increasing the fitting pressure of the cylindrical gasket 13 improves the sealing performance of the wellhead device 5. After the casing head 1 is installed on the top of the wellhead device 5, the threaded ring 33 is twisted to rotate on the surface of the casing head 1. When the threaded ring 33 rotates, it drives the roller group 32 to rotate through the linkage plate 35. When the roller group 32 rotates, it squeezes the triangular plate 40 and pushes the triangular plate 40 to move toward the surface of the casing head 1. When the triangular plate 40 moves, it pushes the movable frame 38 to slide on the surface of the limit plate 37 through the bent plate 39. When the movable frame 38 moves, it pushes the arc extrusion plate 30 to squeeze the wellhead device 5 through the fixed plate 36, and fixes the casing head 1 to the surface of the wellhead device 5 through pressure. The casing head 1 can be installed on the surface of the wellhead device 5 by simply twisting the threaded ring 33, which improves the convenience of installing the casing head 1. A friction pad 31 is provided on the surface of the arc extrusion plate 30. The arc extrusion plate 30 contacts the surface of the wellhead device 5 through the friction pad 31. The friction pad 31 increases the contact force between the arc extrusion plate 30 and the wellhead device 5, thereby improving the stability of the arc extrusion plate 30 in installing the casing head 1. When the arc extrusion plate 30 moves, it will push the inclined block 42 to move. When the inclined block 42 moves, it will push the slide plate 21 to move toward the inside of the slide groove 24 through the arc plate 25, thereby increasing the contact force between the cylindrical gasket 13 and the wellhead device 5.

[0046] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An easy-to-install self-sealing petroleum casing head, comprising a casing head (1), wherein the end of the casing head (1) is fixedly connected to a connecting column (2), the end of the connecting column (2) away from the casing head (1) is fixedly connected to a flange (3), the top of the casing head (1) is provided with a connecting pipe (4), and the bottom of the casing head (1) is provided with a wellhead device (5), characterized in that: A sealing component (6) is provided inside the casing head (1); The sealing component (6) comprises a fixed tube (10), the surface of the fixed tube (10) is fixedly connected to the inner wall of the casing head (1), the inner wall of the fixed tube (10) is fixedly connected to a support plate (14), the inner wall of the support plate (14) is fixedly connected to a plug-in tube (12), the surface of the plug-in tube (12) is sleeved with a sealing gasket (11), the interior of the fixed tube (10) is plugged with a cylindrical gasket (13), the interior of the casing head (1) is provided with an extrusion component (7), and the surface of the casing head (1) is provided with a mounting component (8); The extrusion component (7) includes an arc plate (20), a sliding groove (24) is provided on the surface of the arc plate (20), a slide plate (21) is slidably connected to the inner wall of the sliding groove (24), an inclined plate (23) is fixedly connected to the surface of the slide plate (21), an end of the slide plate (21) away from the inclined plate (23) is fixedly connected to the arc plate (25), and an end of the slide plate (21) close to the arc plate (25) is fixedly connected to the synchronization ring (22); The mounting component (8) includes a threaded ring (33), the inner wall of the threaded ring (33) is threadedly connected to the surface of the casing head (1), the surface of the threaded ring (33) is fixedly connected to a push rod (34), the surface of the threaded ring (33) is fixedly connected to a linkage plate (35), the end of the linkage plate (35) away from the threaded ring (33) is fixedly connected to a roller group (32), the end of the casing head (1) is fixedly connected to a limiting plate (37), the surface of the limiting plate (37) is slidably connected to a movable frame (38), and the upper surface of the movable frame (38) is fixedly connected to the movable frame (38). A fixed plate (36) is connected, one end of the fixed plate (36) away from the movable frame (38) is fixedly connected to a circular arc extrusion plate (30), one end of the circular arc extrusion plate (30) away from the fixed plate (36) is fixedly connected to a friction pad (31), one end of the movable frame (38) away from the fixed plate (36) is fixedly connected to a bent plate (39), one end of the bent plate (39) away from the movable frame (38) is fixedly connected to a triangular plate (40), a groove (41) is provided inside the sleeve head (1), and an end of the circular arc extrusion plate (30) is fixedly connected to an inclined block (42).

2. The easy-to-install self-sealing petroleum casing head according to claim 1, characterized in that: There are two flanges (3), which are symmetrically arranged with the sleeve head (1) as the center. The end of the plug-in tube (12) extends to the outer end of the support plate (14). There are two sealing gaskets (11), which are symmetrically arranged with the support plate (14) as the center.

3. The easy-to-install self-sealing petroleum casing head according to claim 2, characterized in that: The number of the cylindrical gaskets (13) is two, and the two cylindrical gaskets (13) are symmetrically arranged with the support plate (14) as the center. The end of the plug-in tube (12) extends to the inside of the connecting pipe (4) and the wellhead device (5). The surfaces of the two sealing gaskets (11) are in contact with the inner walls of the connecting pipe (4) and the wellhead device (5), respectively. The inner walls of the two cylindrical gaskets (13) are in contact with the surfaces of the connecting pipe (4) and the wellhead device (5), respectively.

4. The easy-to-install self-sealing petroleum casing head according to claim 3, characterized in that: The number of the arc plates (20) is eight, and the eight arc plates (20) are arranged in two groups, with four plates in each group. The surface of the arc plate (20) contacts the inner wall of the fixed tube (10), and the synchronizer ring (22) is located at one end of the arc plate (25) away from the slide groove (24).

5. The easy-to-install self-sealing petroleum casing head according to claim 4, characterized in that: The end of the slide plate (21) extends to the outer end of the slide groove (24), and the end of the inclined plate (23) away from the slide plate (21) is located at the outer end of the slide groove (24). The inner wall of the arc plate (20) contacts the surface of the cylindrical gasket (13), and the four arc plates (20) are arranged around the cylindrical gasket (13).

6. The easy-to-install self-sealing petroleum casing head according to claim 5, characterized in that: The limiting plate (37) is located at one end of the casing head (1) close to the flange (3), and the end of the movable frame (38) away from the limiting plate (37) contacts the surface of the flange (3). The number of the arc extrusion plates (30) is set to eight.

7. The easy-to-install self-sealing petroleum casing head according to claim 6, characterized in that: The eight circular arc extrusion plates (30) are arranged in two groups, and each group has four circular arc extrusion plates. The four circular arc extrusion plates (30) are arranged around the casing head (1) as a central circumference, and the bent plate (39) extends from one end of the movable frame (38) to the surface of the casing head (1).

8. The easy-to-install self-sealing petroleum casing head according to claim 7, characterized in that: One end of the triangular plate (40) away from the bent plate (39) extends to the inside of the roller assembly (32), the surface of the inclined block (42) contacts the inner wall of the groove (41), and the surface of the inclined block (42) contacts the end of the arc plate (25).

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