High-pressure rotary blowout preventer sealed by upper and lower leather cups

Abstract

The utility model relates to the technical field of blowout preventers, in particular to a high-pressure rotary blowout preventer sealed by upper and lower leather cups, which comprises a shell assembly, and one end of the shell assembly is rotatably connected with a hoop; the inner wall of the hoop is fixedly connected with a bearing cylinder; the inner wall of the bearing cylinder is rotationally connected with two sets of second bearings, and the two sets of second bearings are symmetrically arranged. The inner wall of each group of second bearings is fixedly connected with a central pipe; the outer wall of the central pipe is rotatably and fixedly connected with two groups of first bearings, the first bearings are symmetrically arranged, one end of the central pipe is provided with a lower rubber core connecting seat, and the other end of the central pipe is provided with an upper rubber core rotating outer cylinder; by rotating the upper rubber core and the rotating outer cylinder, the sealing rubber cores and the center pipe synchronously rotate, liquid is stressed to rotate and form vortexes through rotation of the center pipe, and due to the fact that the vortexes have the characteristic that the pressure intensity of the edge is higher than that of the center, the liquid impact pressure can be concentrated on the edge, and the liquid is prevented from directly impacting equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of wellhead preventers, in particular to a high-pressure upper and lower leather cup sealed rotary wellhead preventer. Background Technique

[0002] A wellhead preventer relies on the pressure in the annular space in the well and the telescopic ability of the rubber core to enable both the tubing and the tubing coupling to pass through, and seals the annular space between the tubing and the casing. It is a wellhead device used to seal the annular space between the tubing and the casing during workover operations without killing the well.

[0003] Considering that the wellhead preventer usually conducts sealing operations in a high-pressure environment, it is necessary to prevent damage caused by the impact of high-pressure liquid on the equipment during sealing. Traditional equipment usually directly blocks high-pressure liquid during use, and the equipment will be eroded by the liquid impact during operation, thereby reducing its service life. Summary of the Invention

[0004] The purpose of the utility model is to provide a high-pressure upper and lower leather cup sealed rotary wellhead preventer to solve the problems raised in the above background technique.

[0005] To solve the above technical problems, the utility model is realized through the following technical solutions:

[0006] The utility model is a high-pressure upper and lower leather cup sealed rotary wellhead preventer, including a housing assembly. One end of the housing assembly is rotatably connected to a clamp; the inner wall of the clamp is fixedly connected to a bearing barrel; the inner wall of the bearing barrel is rotatably connected to a second bearing, and two groups of second bearings are symmetrically arranged; the inner wall of each group of second bearings is fixedly connected to a central pipe; the outer wall of the central pipe is rotatably and fixedly connected to a first bearing, and two groups of first bearings are symmetrically arranged. One end of the central pipe is provided with a lower rubber core connection seat, and the other end of the central pipe is provided with an upper rubber core rotary outer cylinder; the inner wall of the upper rubber core rotary outer cylinder is rotatably and fixedly connected to an upper rubber core connection seat; one side of the upper rubber core connection seat is provided with a group of sealing rubber cores, and there are two groups of sealing rubber cores in total. The other side of the upper rubber core connection seat is fixedly connected to a torque barrel; the inner wall of the torque barrel is fixedly connected to a hexagon bushing, and the side of the torque barrel away from the upper rubber core connection seat is fixedly connected to a compression ring.

[0007] With the above technical solution, liquid enters from one side of the torque cylinder and flows into the interior of the device. When sealing, the upper glue core and the outer cylinder are rotated to make a set of sealing glue cores and the central tube rotate synchronously. When the central tube rotates, it drives the lower glue core connecting seat and another set of sealing glue cores to rotate. During the rotation process, the liquid is forced to rotate and form a vortex. Since the characteristic of the vortex is that the pressure at the edge is higher than that at the center, the pressure of the liquid impact can be concentrated at the edge, avoiding the direct impact of the liquid on the device. Through the bowl-shaped design of the sealing glue core, it can conduct the flow when contacting the liquid at the edge, and the liquid will collide with each other after the flow conduction. And because the material used for the sealing glue core itself is also a non-rigid material, it can undergo micro-deformation when impacted by the water flow to avoid erosion. At this time, the impact force caused by the liquid can be reduced, achieving the effect of using flexibility to overcome rigidity. Spiral protrusions can be provided on the inner wall of the central tube to conduct the flow when the liquid enters, thereby assisting the liquid to form a vortex, reducing energy consumption, and reducing the direct impact of the liquid on the device during the flow conduction.

[0008] Further, a wear-resistant cylinder is rotatably connected to the outer wall of the central tube on the side close to the first bearing, and two sets of wear-resistant cylinders are symmetrically arranged; a medium-pressure cover is installed on the outer wall of one set of wear-resistant cylinders; a limiting ring is fixedly connected to the side of the medium-pressure cover close to the first bearing, and a plurality of sealing rings are fixedly connected to the inner wall of the medium-pressure cover; the inner wall of the sealing ring is rotatably connected to the wear-resistant cylinder; a lower-pressure cover is installed on the outer wall of the other set of wear-resistant cylinders, a U-shaped sealing ring is fixedly connected to the inner wall of the lower-pressure cover, and one side of the lower-pressure cover is fixedly installed with the other set of sealing glue cores.

[0009] With the above technical solution, when the first bearing and the second bearing rotate, the bearing cylinder can be prevented from rotating, and the first bearing and the second bearing are sealed through the connection of the medium-pressure cover, the lower-pressure cover and the wear-resistant cylinder, so as to prevent the liquid inside the device from flowing into the first bearing and the second bearing, and prevent the leakage of the internal liquid and the lubricating oil of the first bearing and the second bearing. At the same time, since the central tube rotates, it will continuously rub during the operation of the device. Through the setting of the wear-resistant cylinder, wear-resistant materials can be used to resist wear, and it can be disassembled, which can also reduce the use cost; through the setting of the limiting ring, the medium-pressure cover and the lower-pressure cover can be prevented from directly contacting the first bearing, so as to prevent the friction caused by the contact from affecting the rotation of the first bearing.

[0010] Further, a positioning ring is fixedly connected to the side of the lower-pressure cover close to the first bearing, and there are two sets of positioning rings. The inner wall of each set of positioning rings is rotatably connected to the outer wall of the first bearing.

[0011] With the above technical solution, the first bearing can be limited by the positioning ring, and the movement of the second bearing can be blocked, preventing the first bearing from coming into contact with the second bearing, avoiding wear or collision caused by contact, and preventing the second bearing from deviating from its original position during rotation, thus avoiding the second bearing from getting out of its original position.

[0012] Furthermore, a top pressure cover is fixedly installed on one side of the upper glue core rotating outer cylinder. The inner wall of the top pressure cover is rotationally connected to the outer wall of the upper glue core connecting seat. One side of the top pressure cover is fixedly connected with a first lifting eye bolt, and there are four groups of first lifting eye bolts; one side of the clamp is fixedly connected with a second lifting eye bolt, and there are two groups of second lifting eye bolts.

[0013] With the above technical solution, the position of the equipment can be fixed through the settings of the first lifting eye bolt and the second lifting eye bolt, and the first lifting eye bolt can be disassembled through the setting of the top pressure cover to facilitate the equipment to return to its original position after maintenance.

[0014] Furthermore, a second blind flange is installed at the bottom of the housing assembly, a first blind flange is installed on one side of the housing assembly, and a limit screw is provided on one side of the housing assembly.

[0015] With the above technical solution, when the liquid pressure is too high, it flows to the second blind flange and the first blind flange and undergoes slow flow. When external equipment needs to be connected, it can also be connected through the second blind flange and the first blind flange. The position of the housing assembly can be restricted through the setting of the limit screw to fix the housing assembly.

[0016] Furthermore, the side of the housing assembly away from the first blind flange is U-shaped, and both ends of the U-shape are fixedly connected with connecting plug plates; the inner wall of the connecting plug plate is clamped with a fork plate pin, and a hydraulic cylinder assembly is fixedly connected to the middle of the connecting plug plate.

[0017] With the above technical solution, the upper glue core rotating outer cylinder and the central tube can be rotated by an external force through the settings of the hydraulic cylinder assembly and the connecting plug plate to prevent the upper glue core rotating outer cylinder and the central tube from not being able to rotate due to insufficient internal liquid pressure. The fork plate pin can prevent the hydraulic cylinder assembly from shaking and tilting during operation, thus affecting the hydraulic effect.

[0018] The utility model has the following beneficial effects:

[0019] 1. Liquid enters from one side of the torque cylinder and flows into the interior of the device. When sealing, the outer cylinder is rotated by rotating the glue application core, causing a set of sealing glue cores and the central tube to rotate synchronously. When the central tube rotates, it drives the lower glue core connecting seat and another set of sealing glue cores to rotate. During the rotation process, the liquid is forced to rotate and form a vortex. Since the characteristic of the vortex is that the pressure at the edge is higher than that at the center, the impact pressure of the liquid can be concentrated at the edge, avoiding direct impact of the liquid on the device.

[0020] 2. Through the bowl-shaped design of the sealing glue core, it can conduct the flow when contacting the liquid at the edge, and after the flow diversion, the liquids will collide with each other. Also, since the material used for the sealing glue core itself is not a rigid material, it can undergo micro-deformation when impacted by the water flow to avoid erosion. At this time, the impact force caused by the liquid can be reduced, achieving the effect of using softness to overcome rigidity.

[0021] Of course, it is not necessary for any product implementing the present utility model to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0023] Figure 1 It is a schematic diagram of an overall half-section;

[0024] Figure 2 It is a schematic diagram of a side half-section;

[0025] Figure 3 It is Figure 1 A partial enlarged schematic diagram at position A in

[0026] In the drawings, the list of components represented by each reference numeral is as follows:

[0027] In the figure: 1. First lifting ring screw; 2. Pressure ring; 3. Torque cylinder; 4. Hexagonal bushing; 5. Upper gland; 6. Upper glue core connecting seat; 7. Upper glue core rotating outer cylinder; 8. Sealing glue core; 9. Middle gland; 10. Wear-resistant cylinder; 11. Limit ring; 12. Bearing cylinder; 13. First bearing; 14. Second bearing; 15. Limit screw; 16. Central tube; 17. Positioning ring; 18. Lower gland; 19. U-shaped sealing ring; 20. Lower glue core connecting seat; 21. Housing assembly; 22. First blind flange; 23. Second blind flange; 24. Clamp pair; 25. Second lifting ring screw; 26. Hydraulic cylinder assembly; 27. Fork plate pin; 28. Connecting fork plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] Please refer to Figures 1 - 3 As shown, the present invention is a high-pressure upper and lower cup seal rotary wellhead protector, including a housing assembly 21. One end of the housing assembly 21 is rotatably connected to a clamp 24; an inner wall of the clamp 24 is fixedly connected to a bearing cylinder 12; an inner wall of the bearing cylinder 12 is rotatably connected to a second bearing 14, and two sets of the second bearings 14 are symmetrically arranged; an inner wall of each set of the second bearings 14 is fixedly connected to a central pipe 16; an outer wall of the central pipe 16 is rotatably and fixedly connected to a first bearing 13, and two sets of the first bearings 13 are symmetrically arranged. One end of the central pipe 16 is provided with a lower rubber core connecting seat 20, and the other end of the central pipe 16 is provided with an upper rubber core rotary outer cylinder 7; an inner wall of the upper rubber core rotary outer cylinder 7 is rotatably and fixedly connected to an upper rubber core connecting seat 6; one side of the upper rubber core connecting seat 6 is provided with a set of sealing rubber cores 8, and there are two sets of the sealing rubber cores 8 in total. The other side of the upper rubber core connecting seat 6 is fixedly connected to a torque cylinder 3; an inner wall of the torque cylinder 3 is fixedly connected to a hexagon bushing 4, and one side of the torque cylinder 3 away from the upper rubber core connecting seat 6 is fixedly connected to a pressure ring 2.

[0030] In this embodiment, considering that the wellhead protector is usually used for sealing operations in a high-pressure environment, it is necessary to prevent damage caused by the impact of high-pressure liquid on the equipment during sealing. When traditional equipment is used, it usually directly blocks high-pressure liquid, and the equipment will be eroded by the liquid impact during operation, resulting in a reduction in its service life.

[0031] By allowing liquid to enter from one side of the torque tube 3 and flow into the interior of the device, when sealing, the outer cylinder 7 is rotated by rotating the glue-applying core, causing a set of sealing rubber cores 8 and the central tube 16 to rotate synchronously. When the central tube 16 rotates, it drives the lower rubber core connecting seat 20 and another set of sealing rubber cores 8 to rotate. During the rotation process, the liquid is forced to rotate and form a vortex. Since the characteristic of a vortex is that the pressure at the edge is higher than that at the center, the impact pressure of the liquid can be concentrated at the edge, avoiding direct impact of the liquid on the device. Through the bowl-shaped design of the sealing rubber core 8, it can conduct the flow of the liquid when it contacts the liquid at the edge, and after the flow diversion, the liquids will collide with each other. Also, since the material used for the sealing rubber core 8 itself is not a rigid material, it can undergo micro-deformation when impacted by the water flow to avoid erosion. At this time, the impact force caused by the liquid can be reduced, achieving the effect of using flexibility to overcome rigidity. Helical protrusions can be provided on the inner wall of the central tube 16 to assist in guiding the liquid to form a vortex when the liquid enters, which can reduce energy consumption and also reduce the direct impact of the liquid on the device during the flow diversion.

[0032] Specifically, on the outer wall of one side of the central tube 16 close to the first bearing 13, a wear-resistant cylinder 10 is rotatably connected, and two sets of wear-resistant cylinders 10 are symmetrically arranged; on the outer wall of one set of wear-resistant cylinders 10, a medium-pressure cover 9 is installed; on the side of the medium-pressure cover 9 close to the first bearing 13, a limit ring 11 is fixedly connected, and on the inner wall of the medium-pressure cover 9, a sealing ring is fixedly connected, and there are multiple sets of sealing rings; the inner wall of the sealing ring is rotatably connected to the wear-resistant cylinder 10; on the outer wall of the other set of wear-resistant cylinders 10, a lower-pressure cover 18 is installed, and a U-shaped sealing ring 19 is fixedly connected to the inner wall of the lower-pressure cover 18, and one side of the lower-pressure cover 18 is fixedly installed with another set of sealing rubber cores 8.

[0033] In this embodiment, during rotation, the first bearing 13 and the second bearing 14 can prevent the bearing cylinder 12 from rotating, and the first bearing 13 and the second bearing 14 are sealed through the connection of the medium-pressure cover 9, the lower-pressure cover 18, and the wear-resistant cylinder 10, to prevent the liquid inside the device from flowing into the first bearing 13 and the second bearing 14, and to prevent the leakage of the internal liquid and the lubricating oil of the first bearing 13 and the second bearing 14. At the same time, since the central tube 16 rotates and there will be continuous friction during the operation of the device, the wear-resistant cylinder 10 can be used to resist wear with wear-resistant materials, and it can be disassembled to reduce the usage cost; through the setting of the limit ring 11, the medium-pressure cover 9 and the lower-pressure cover 18 can be prevented from directly contacting the first bearing 13, to prevent the friction caused by the contact from affecting the rotation of the first bearing 13.

[0034] Specifically, on the side of the lower-pressure cover 18 close to the first bearing 13, two sets of positioning rings 17 are fixedly connected, and the inner wall of each set of positioning rings 17 is rotatably connected to the outer wall of the first bearing 13.

[0035] In this embodiment, the positioning ring 17 can limit the first bearing 13 and prevent the second bearing 14 from moving, preventing contact between the first bearing 13 and the second bearing 14 and avoiding wear or collision caused by contact. It can also prevent the second bearing 14 from shifting from its original position during rotation and avoid the second bearing 14 detaching from its original position.

[0036] Specifically, a upper gland 5 is fixedly installed on one side of the upper glue core rotating outer cylinder 7. The inner wall of the upper gland 5 is rotatably connected to the outer wall of the upper glue core connecting seat 6. One side of the upper gland 5 is fixedly connected with a first lifting eye bolt 1, and there are four groups of first lifting eye bolts 1; one side of the clamp 24 is fixedly connected with a second lifting eye bolt 25, and there are two groups of second lifting eye bolts 25.

[0037] In this embodiment, the first lifting eye bolt 1 and the second lifting eye bolt 25 can fix the position of the equipment, and the upper gland 5 can be used to disassemble the first lifting eye bolt 1 to facilitate the equipment to return to its original position after maintenance.

[0038] Specifically, a second blind flange 23 is installed at the bottom of the housing assembly 21, a first blind flange 22 is installed on one side of the housing assembly 21, and a limit screw 15 is provided on one side of the housing assembly 21.

[0039] In this embodiment, when the liquid pressure is too high, it flows to the second blind flange 23 and the first blind flange 22 for slow flow. When connecting external equipment, it can also be connected through the second blind flange 23 and the first blind flange 22. The limit screw 15 can limit the position of the housing assembly 21 to fix the housing assembly 21.

[0040] Specifically, the side of the housing assembly 21 away from the first blind flange 22 is U-shaped, and both ends of the U-shape are fixedly connected with connecting inserts 28; the inner wall of the connecting insert 28 is clamped with a fork plate pin 27, and the middle of the connecting insert 28 is fixedly connected with a hydraulic cylinder assembly 26.

[0041] In this embodiment, the hydraulic cylinder assembly 26 and the connecting insert 28 can be used to rotate the upper glue core rotating outer cylinder 7 and the central tube 16 by an external force to prevent the upper glue core rotating outer cylinder 7 and the central tube 16 from not rotating due to insufficient internal liquid pressure. The fork plate pin 27 can prevent the hydraulic cylinder assembly 26 from tilting due to jitter during operation, thus affecting the hydraulic effect.

[0042] During use,

[0043] First, during use, the glue-applying core rotating outer cylinder 7 and the central tube 16 can be rotated hydraulically. Through the arrangement of the hydraulic cylinder assembly 26 and the connecting plug board 28, an external force can be used to rotate the glue-applying core rotating outer cylinder 7 and the central tube 16, directly driving the glue-applying core rotating outer cylinder 7 and the central tube 16, and preventing the inability to rotate the glue-applying core rotating outer cylinder 7 and the central tube 16 due to insufficient internal liquid pressure.

[0044] Secondly, when liquid enters from one side of the torque cylinder 3 and flows into the device interior, during sealing, by rotating the glue-applying core rotating outer cylinder 7, a set of sealing glue cores 8 and the central tube 16 rotate synchronously. When the central tube 16 rotates, it drives the lower glue core connecting seat 20 and another set of sealing glue cores 8 to rotate. During the rotation process, the liquid is forced to rotate and form a vortex. Since the characteristic of a vortex is that the pressure at the edge is higher than that at the center, the pressure of the liquid impact can be concentrated at the edge, avoiding the direct impact of the liquid on the device.

[0045] Finally, through the bowl-shaped design of the sealing glue core 8, when it contacts the liquid at the edge, it can conduct the flow. After the flow conduction, the liquids will impact each other. And since the material used for the sealing glue core 8 itself is also a non-rigid material, it can undergo micro-deformation when impacted by the water flow to avoid erosion. At this time, the impact force caused by the liquid can be reduced, achieving the effect of using flexibility to overcome rigidity.

[0046] The preferred embodiments of the present utility model disclosed above are only used to help illustrate the present utility model. The preferred embodiments do not describe all the details in detail, nor limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present utility model, so that those skilled in the relevant technical field can well understand and utilize the present utility model. The present utility model is only limited by the claims and their full scope and equivalents.

Claims

1. A high-pressure upper and lower leather cup sealing rotary wellhead preventer, comprising a housing assembly (21), characterized in that: One end of the housing assembly (21) is rotatably connected to a clamp (24); the inner wall of the clamp (24) is rotatably connected to a bearing cylinder (12); the inner wall of the bearing cylinder (12) is rotatably connected to a second bearing (14), and two groups of the second bearings (14) are symmetrically arranged; the inner wall of each group of the second bearings (14) is fixedly connected to a central pipe (16); the outer wall of the central pipe (16) is rotatably and fixedly connected to a first bearing (13), and two groups of the first bearings (13) are symmetrically arranged. One end of the central pipe (16) is provided with a lower rubber core connecting seat (20), and the other end of the central pipe (16) is provided with an upper rubber core rotating outer cylinder (7); the inner wall of the upper rubber core rotating outer cylinder (7) is rotatably and fixedly connected to an upper rubber core connecting seat (6); one side of the upper rubber core connecting seat (6) is provided with a group of sealing rubber cores (8), and there are two groups of the sealing rubber cores (8) in total. The outer wall of the central pipe (16) near one side of the first bearing (13) is provided with wear-resistant cylinders (10), and two groups of the wear-resistant cylinders (10) are symmetrically arranged; the outer wall of one group of the wear-resistant cylinders (10) is rotatably connected to a medium-pressure cover (9); the outer wall of the other group of the wear-resistant cylinders (10) is rotatably connected to a lower-pressure cover (18). The inner wall of the lower-pressure cover (18) is fixedly connected with a U-shaped sealing ring (19). One side of the lower-pressure cover (18) is fixedly installed with the other group of sealing rubber cores (8). The other side of the upper rubber core connecting seat (6) is fixedly connected to a torque cylinder (3); the inner wall of the torque cylinder (3) is fixedly connected with a hexagon bushing (4), and one side of the torque cylinder (3) away from the upper rubber core connecting seat (6) is fixedly connected to a pressing ring (2).

2. The high-pressure upper and lower leather cup seal rotary wellhead preventer according to claim 1, characterized in that: One side of the medium-pressure cover (9) near the first bearing (13) is fixedly connected with a limit ring (11), and the inner wall of the medium-pressure cover (9) is fixedly connected with a plurality of sealing rings; the inner wall of the sealing rings is rotatably connected to the wear-resistant cylinder (10).

3. A high-pressure upper and lower leather cup seal rotary wellhead protector according to claim 1, characterized in that: One side of the lower-pressure cover (18) near the first bearing (13) is fixedly connected with positioning rings (17), and there are two groups of the positioning rings (17). The inner wall of each group of the positioning rings (17) is rotatably connected to the outer wall of the first bearing (13).

4. A high-pressure upper and lower leather cup sealing rotary wellhead protector according to claim 1, characterized in that: One side of the upper rubber core rotating outer cylinder (7) is fixedly installed with an upper-pressure cover (5). The inner wall of the upper-pressure cover (5) is rotatably connected to the outer wall of the upper rubber core connecting seat (6). One side of the upper-pressure cover (5) is fixedly connected with first lifting eye bolts (1), and there are four groups of the first lifting eye bolts (1); one side of the clamp (24) is fixedly connected with second lifting eye bolts (25), and there are two groups of the second lifting eye bolts (25).

5. The high-pressure upper and lower leather cup seal rotary wellhead preventer according to claim 1, characterized in that: The bottom of the housing assembly (21) is provided with a second blind flange (23), one side of the housing assembly (21) is provided with a first blind flange (22), and one side of the housing assembly (21) is provided with limit screws (15).

6. The high-pressure upper and lower leather cup seal rotary wellhead protector according to claim 1, wherein: One side of the housing assembly (21) away from the first blind flange (22) is U-shaped, and connecting inserts (28) are fixedly connected to both ends of the U-shape; a fork plate pin (27) is clamped to the inner wall of the connecting insert (28), and a hydraulic cylinder assembly (26) is fixedly connected to the middle of the connecting insert (28).

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