A blowout preventer having a wide flange body and methods of using the same

Abstract

The application discloses a blowout preventer with a wide flange body, and belongs to the technical field of well drilling. The blowout preventer with a wide flange body and a use method thereof comprise a drilling hole, a blowout preventer body and a wide flange body, the blowout preventer body is installed at the top of the drilling hole, the wide flange body is arranged at the top of the blowout preventer body, an activity cavity is arranged in the blowout preventer body, a steel shear is movably connected in the activity cavity, a steel shear connected with an electric telescopic rod is arranged in the blowout preventer body outside the activity cavity, a first fixing plate is arranged at the top of the inner wall of the activity cavity, a bidirectional screw rod is arranged on the inner side of the first fixing plate, and a U-shaped piece is movably connected to the surface of the bidirectional screw rod. The blowout preventer with a wide flange body can limit the drilling pipe, avoids the leakage caused by the damage of the inner wall of the drilling hole due to the inclination of the drilling pipe when the drilling pipe is cut by the steel shear, can realize the connection between the steel shear and the first limiting ring according to the requirement, and facilitates the post-treatment after the sealing of the drilling hole.

Description

Technical Field

[0001] This invention relates to the field of drilling equipment technology, and more specifically, to a blowout preventer with a wide flange and its method of use. Background Technology

[0002] Blowout preventers (BOPs) used in oil or gas wells prevent the potential catastrophic event known as a blowout, in which high pressure and uncontrolled fluid from the wellbore can eject pipes (such as drill pipe and casing), tools, and drilling fluid out of the wellbore. Blowouts pose serious safety hazards to drilling personnel, drilling rigs, and the environment, and are extremely costly.

[0003] Typically, BOPs (Blowout Preventers) have a plunger that is hydraulically pushed through the borehole to seal it. In some cases, these plungers have hardened steel shears that can cut through the drill string that may be in the borehole. When the steel shears cut the drill string, it may cause the drill string to tilt under stress, potentially damaging the borehole wall or even surface equipment and causing unnecessary economic losses. Furthermore, after the blowout preventer seals the borehole, subsequent operations may still be required. Re-drilling the borehole is time-consuming and labor-intensive, while using the original borehole may result in broken rods remaining inside, affecting subsequent use. Summary of the Invention

[0004] Technical problems to be solved

[0005] The purpose of this invention is to provide a blowout preventer with a wide flange and its method of use, in order to solve the problems mentioned in the background art above:

[0006] Typically, BOPs (Blowout Preventers) have a plunger that is hydraulically pushed through the borehole to seal it. In some cases, these plungers have hardened steel shears that can cut through the drill string that may be in the borehole. When the steel shears cut the drill string, it may cause the drill string to tilt under stress, potentially damaging the borehole wall or even surface equipment and causing unnecessary economic losses. Furthermore, after the blowout preventer seals the borehole, subsequent operations may still be required. Re-drilling the borehole is time-consuming and labor-intensive, while using the original borehole may result in broken rods remaining inside, affecting subsequent use.

[0007] Technical solution

[0008] A blowout preventer with a wide flange and its method of use include a drilled hole, a blowout preventer body, and a wide flange. The blowout preventer body is mounted on top of the drilled hole, and the wide flange is disposed on top of the blowout preventer body. A movable cavity is provided inside the blowout preventer body, and a steel shear is movably connected inside the movable cavity. A steel shear connected to an electric telescopic rod is installed inside the blowout preventer body outside the movable cavity. A first fixing plate is provided on the top of the inner wall of the movable cavity, and a bidirectional lead screw is provided on the inner side of the first fixing plate. A U-shaped component is movably connected to the surface of the bidirectional lead screw, and a first limiting ring is provided on the inner side of the U-shaped component. A gear assembly connecting the steel shear to the bidirectional lead screw is provided at one end of the bidirectional lead screw.

[0009] Preferably, the U-shaped component has a screw hole inside that matches the bidirectional lead screw, and the inner wall of the first limiting ring has a friction surface.

[0010] Preferably, the outer end of the upper surface of the steel shear is provided with a movable plate, the outer side of the blowout preventer body is provided with a guide rod, the interior of the movable plate is provided with a movable hole that matches the guide rod, and the steel shear is movably connected to the blowout preventer body through the guide rod provided in the movable hole.

[0011] Preferably, a limiting plate is provided at the outer end of the guide rod, and the outer diameter of the limiting plate is larger than the inner diameter of the movable hole.

[0012] Preferably, the gear assembly includes a rotating shaft, a first gear, a first bevel gear, a second bevel gear, a second gear, and a toothed plate. The second bevel gear is disposed at the outer end of the bidirectional lead screw. The rotating shaft is rotatably connected to the inside of the blowout preventer body below the second bevel gear. The top end of the rotating shaft is provided with the first gear. The upper surface of the first gear is provided with a first bevel gear that meshes with the second bevel gear. The side surface of the steel shear is provided with a toothed plate. The second gear is disposed between the toothed plate and the first gear.

[0013] Preferably, a rotating rod is provided on the upper surface of the second gear, and a limit component is provided at the top end of the rotating rod.

[0014] Preferably, the limiting component includes a second limiting ring, a movable locking block, and a second fixing plate. The second limiting ring is disposed at the top of the rotating rod, and the movable locking block is movably connected to the upper surface of the second limiting ring. The upper surface of the blowout preventer body on one side of the second limiting ring is provided with a second fixing plate, and the interior of the second fixing plate is provided with a slot that matches the movable locking block.

[0015] Preferably, the upper surface of the second limiting ring is provided with a sliding groove, the inner wall of the sliding groove is provided with a guide rail, the side surface of the movable block is provided with a movable groove that matches the guide rail, and the movable block is movably connected to the sliding groove through the guide rail provided in the movable groove.

[0016] Preferably, the upper surface of the movable card block is provided with an operating ball.

[0017] A method for using a blowout preventer with a wide flange includes the following steps:

[0018] S1: First, the staff installs the device on the top of the borehole. Then, when it is necessary to seal the borehole, the electric telescopic rod is used to drive the steel shears to cut the drill pipe inside the borehole. While the electric telescopic rod drives the steel shears to cut, the toothed plate on the surface of the steel shears drives the second gear to rotate, which in turn drives the first gear to rotate, thus rotating the first bevel gear. The first bevel gear drives the second bevel gear to rotate, which in turn drives the bidirectional lead screw to rotate. This causes the U-shaped part on the surface of the bidirectional lead screw to drive the first limiting ring to move in opposite directions, thus limiting the drill pipe.

[0019] S2: After the blowout preventer seals the borehole, the second limiting ring causes the rotating rod to move the second gear downward, disengaging the second gear from the toothed plate, thereby disengaging the steel shears from the double-acting screw. Then, by operating the ball to move the locking block, the locking block engages with the corresponding slot. At this time, the steel shears can be operated independently without affecting the first limiting ring. Conversely, the second limiting ring causes the rotating rod to move the second gear upward, meshing the second gear with the toothed plate, thereby connecting the steel shears to the double-acting screw. Then, by operating the ball to move the locking block, the locking block engages with the corresponding slot.

[0020] Beneficial effects

[0021] Compared with the prior art, the advantages of this invention are:

[0022] 1) When using this blowout preventer with a wide flange and its method of use, if it is necessary to seal the borehole, an electric telescopic rod is used to drive steel shears to cut the drill pipe inside the borehole. While the electric telescopic rod drives the steel shears to cut, the toothed plate on the surface of the steel shears drives the second gear to rotate, causing the first gear to rotate, thereby rotating the first bevel gear. The first bevel gear drives the second bevel gear to rotate, causing the double-acting screw to rotate. This causes the U-shaped part on the surface of the double-acting screw to drive the first limiting ring to move in opposite directions, thereby limiting the drill pipe and preventing leakage caused by the drill pipe tilting and damage to the inner wall of the borehole when the steel shears cut the drill pipe.

[0023] 2) This blowout preventer with a wide flange and its usage method: During use, the second limiting ring causes the rotating rod to move downward, thereby disengaging the steel shears from the double-acting screw. At this time, the steel shears can be operated independently without affecting the first limiting ring. Conversely, the second limiting ring causes the rotating rod to move upward, connecting the steel shears to the double-acting screw. Then, by operating the ball to move the locking block, the locking block engages with the corresponding locking slot. The connection between the steel shears and the first limiting ring can be achieved as needed, facilitating the post-drilling sealing process. The first limiting ring can limit the remaining broken rod, preventing it from sinking and facilitating retrieval. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the internal structure of the blowout preventer body of the present invention;

[0026] Figure 3 This is a schematic diagram of the movable plate structure of the present invention;

[0027] Figure 4 for Figure 3 A magnified view of part A in the image;

[0028] Figure 5 for Figure 1 A magnified view of part B in the image.

[0029] The following are the labeling symbols in the diagram: 1. Blowout preventer body; 2. Drill hole; 3. Wide flange; 4. First fixing plate; 5. Two-way lead screw; 6. U-shaped part; 7. First limiting ring; 8. Steel shears; 9. Guide rod; 10. Movable plate; 11. Electric telescopic rod; 12. Movable cavity; 13. Rotating shaft; 14. First gear; 15. First bevel gear; 16. Second bevel gear; 17. Rotating rod; 18. Second gear; 19. Gear plate; 20. Second limiting ring; 21. Second fixing plate; 22. Slot; 23. Slide groove; 24. Guide rail; 25. Operating ball; 26. Movable locking block; 27. Friction surface; 28. Limiting plate; 29. ​​Movable hole; 30. Movable groove. Detailed Implementation

[0030] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0031] In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] Example 1:

[0034] Typically, BOPs (Boiler Openings) have a plunger that is hydraulically pushed through the borehole to seal it. In some cases, these plungers have hardened steel shears that can pass through the drill string that may be in the borehole. When the steel shears shear the drill string, it may cause the drill string to tilt under stress, potentially damaging the borehole wall or even surface equipment and causing unnecessary economic losses. The following solutions address this problem.

[0035] Please see Figures 1 to 5A blowout preventer (BOP) with a wide flange body includes a borehole 2, a BOP body 1, and a wide flange body 3. The BOP body 1 is mounted on top of the borehole 2, and the wide flange body 3 is located on top of the BOP body 1. The wide flange body 3 is a major reinforcing element for the opening of a pressure vessel and is commonly used in important applications such as flammable and explosive, high-pressure, high-temperature, low-temperature, thick-walled pressure vessels, pressure vessels requiring fatigue analysis, and pressure vessels containing extremely or highly hazardous media. The BOP body 1 has an internal movable chamber 12, with a steel shear 8 movably connected inside the movable chamber 12. The steel shear 8, connected to an electric telescopic rod 11, is installed inside the BOP body 1 on the outside of the movable chamber 12. The electric telescopic rod 11 is a conventional electric telescopic device in the prior art, capable of moving the steel shear 8. A first fixed plate 4 is located at the top of the inner wall of the movable chamber 12, and a bidirectional lead screw 5 is located on the inner side of the first fixed plate 4. A U-shaped component 6 is movably connected to the surface of the bidirectional lead screw 5. The U-shaped component 6 has a screw hole that matches the bidirectional lead screw 5. A first limiting ring 7 is provided on the inner side of the U-shaped component 6. A gear assembly connecting the steel shears 8 and the bidirectional lead screw 5 is provided at one end of the bidirectional lead screw 5. When sealing the drill hole is required, the electric telescopic rod 11 is used to drive the steel shears 8 to cut the drill tube in the drill hole 2. While the electric telescopic rod 11 drives the steel shears 8 to cut, the toothed plate 19 on the surface of the steel shears 8 drives the second gear 18 to rotate, causing the first gear 14 to rotate, thereby rotating the first bevel gear 15. The first bevel gear 15 drives the second bevel gear 16 to rotate, causing the bidirectional lead screw 5 to rotate. This causes the U-shaped component 6 on the surface of the bidirectional lead screw 5 to drive the first limiting ring 7 to move in opposite directions, thereby limiting the drill tube and preventing leakage caused by the drill tube tilting and damage to the inner wall of the drill hole when the steel shears 8 cuts the drill tube.

[0036] As a further aspect of the present invention: the U-shaped part 6 is provided with a screw hole that matches the bidirectional lead screw 5, and the inner wall of the first limiting ring 7 is provided with a friction surface 27. The friction surface 27 can increase the friction force of the first limiting ring 7 on the broken rod, thereby better limiting the broken rod.

[0037] As a further embodiment of the present invention: a movable plate 10 is provided at the outer end of the upper surface of the steel shears 8, a guide rod 9 is provided on the outer side of the blowout preventer body 1, and a movable hole 29 matching the guide rod 9 is provided inside the movable plate 10. The steel shears 8 is movably connected to the blowout preventer body 1 through the guide rod 9 provided in the movable hole 29, thereby increasing the stability of the movement of the steel shears 8.

[0038] As a further embodiment of the present invention: a limiting plate 28 is provided at the outer end of the guide rod 9, the outer diameter of the limiting plate 28 being larger than the inner diameter of the movable hole 29, thereby preventing the steel shears 8 from detaching from the guide rod 9.

[0039] As a further embodiment of the present invention: the gear assembly includes a rotating shaft 13, a first gear 14, a first bevel gear 15, a second bevel gear 16, a second gear 18, and a toothed plate 19. The second bevel gear 16 is disposed at the outer end of the bidirectional lead screw 5. The rotating shaft 13 is rotatably connected to the inside of the blowout preventer body 1 below the second bevel gear 16. The top end of the rotating shaft 13 is provided with the first gear 14. The upper surface of the first gear 14 is provided with the first bevel gear 15 that meshes with the second bevel gear 16. The side surface of the steel shear 8 is provided with the toothed plate 19. The second gear 18 is disposed between the toothed plate 19 and the first gear 14, thereby realizing the connection between the steel shear 8 and the bidirectional lead screw 5.

[0040] The steps for using this invention are as follows: When using this blowout preventer with a wide flange, the operator first installs the device on the top of the borehole 2. Then, when it is necessary to seal the borehole, the electric telescopic rod 11 is used to drive the steel shears 8 to cut the drill pipe inside the borehole 2. While the electric telescopic rod 11 drives the steel shears 8 to cut, the toothed plate 19 on the surface of the steel shears 8 drives the second gear 18 to rotate, causing the first gear 14 to rotate, thereby rotating the first bevel gear 15. The first bevel gear 15 drives the second bevel gear 16 to rotate, causing the bidirectional lead screw 5 to rotate. This causes the U-shaped part 6 on the surface of the bidirectional lead screw 5 to drive the first limiting ring 7 to move in opposite directions, thereby limiting the drill pipe and preventing leakage caused by the drill pipe tilting and damage to the inner wall of the borehole when the steel shears 8 cuts the drill pipe.

[0041] Example 2:

[0042] After the blowout preventer seals the borehole, further operations may be required. Re-drilling the borehole is time-consuming and laborious, while using the original borehole may result in the remaining broken rod inside affecting subsequent use. The following solutions address these issues.

[0043] Please see Figures 1 to 5The difference from Embodiment 1 is that a rotating rod 17 is provided on the upper surface of the second gear 18, and a limiting component is provided at the top of the rotating rod 17. The limiting component includes a second limiting ring 20, a movable locking block 26, and a second fixing plate 21. The second limiting ring 20 is located at the top of the rotating rod 17, and the movable locking block 26 is movably connected to the upper surface of the second limiting ring 20. The second fixing plate 21 is provided on the upper surface of the blowout preventer body 1 on one side of the second limiting ring 20. The interior of the second fixing plate 21 has a slot 22 that matches the movable locking block 26. The upper surface of the second limiting ring 20 has a sliding groove 23, and the inner wall of the sliding groove 23 has a guide rail 24. The side surface of the movable locking block 26 has a movable groove 30 that matches the guide rail 24. The movable locking block 26 is connected to the movable locking block 26 by means of a movable locking block 26. The guide rail 24 in the moving groove 30 is movably connected to the sliding groove 23. The upper surface of the movable locking block 26 is provided with an operating ball 25. The second limiting ring 20 causes the rotating rod 17 to drive the second gear 18 to move downward, thereby disengaging the steel shears 8 from the double-acting screw 5. At this time, the steel shears 8 can be operated alone without affecting the first limiting ring 7. Conversely, the second limiting ring 20 causes the rotating rod 17 to drive the second gear 18 to move upward, connecting the steel shears 8 to the double-acting screw 5. Then, the operating ball 25 moves the locking block 26 to engage with the corresponding locking groove 22. The connection between the steel shears 8 and the first limiting ring 7 can be realized as needed, which facilitates the post-sealing of the borehole 2. The first limiting ring 7 can limit the remaining broken rod, preventing the broken rod from sinking and facilitating retrieval.

[0044] The steps of using this invention are as follows: When the blowout preventer with a wide flange is in use, after the blowout preventer seals the borehole 2, the second limiting ring 20 causes the rotating rod 17 to drive the second gear 18 downward, causing the second gear 18 to disengage from the toothed plate 19, thereby disengaging the steel shears 8 from the double-acting screw 5. Then, the operating ball 25 moves the locking block 26, causing the locking block 26 to engage with the corresponding locking groove 22. At this time, the steel shears 8 can be operated independently without affecting the first limiting ring 7. Conversely, the second limiting ring 20 causes the rotating rod 17 to drive the second gear 18 upward, causing the second gear 18 to mesh with the toothed plate 19, thereby connecting the steel shears 8 to the double-acting screw 5. Then, the operating ball 25 moves the locking block 26, causing the locking block 26 to engage with the corresponding locking groove 22. This solution can realize the connection between the steel shears 8 and the first limiting ring 7 as needed, which facilitates the post-sealing processing of the borehole 2. In addition, the first limiting ring 7 can limit the remaining broken rod, preventing the broken rod from sinking and facilitating retrieval.

[0045] A method for using a blowout preventer with a wide flange includes the following steps:

[0046] S1: First, the staff installs the device on the top of the borehole 2. Then, when it is necessary to seal the borehole, the electric telescopic rod 11 is used to drive the steel shears 8 to cut the drill pipe inside the borehole 2. While the electric telescopic rod 11 drives the steel shears 8 to cut, the toothed plate 19 on the surface of the steel shears 8 drives the second gear 18 to rotate, causing the first gear 14 to rotate, thereby rotating the first bevel gear 15. The first bevel gear 15 drives the second bevel gear 16 to rotate, causing the bidirectional lead screw 5 to rotate. This causes the U-shaped part 6 on the surface of the bidirectional lead screw 5 to drive the first limiting ring 7 to move in opposite directions, thereby limiting the drill pipe.

[0047] S2: After the blowout preventer seals the borehole 2, the second limiting ring 20 causes the rotating rod 17 to drive the second gear 18 downward, causing the second gear 18 to disengage from the toothed plate 19, thereby disengaging the steel shears 8 from the double-acting screw 5. Then, the operating ball 25 moves the locking block 26, causing the locking block 26 to engage with the corresponding locking slot 22. At this time, the steel shears 8 can be operated independently without affecting the first limiting ring 7. Conversely, the second limiting ring 20 causes the rotating rod 17 to drive the second gear 18 upward, causing the second gear 18 to mesh with the toothed plate 19, thereby connecting the steel shears 8 to the double-acting screw 5. Then, the operating ball 25 moves the locking block 26, causing the locking block 26 to engage with the corresponding locking slot 22.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A blowout preventer with a wide flange, comprising a blowout preventer body (1) and a wide flange (3), wherein the blowout preventer body (1) is mounted on top of a borehole (2), and the wide flange (3) is disposed on top of the blowout preventer body (1), characterized in that: The blowout preventer body (1) has an internal movable cavity (12), and a steel shear (8) is movably connected inside the movable cavity (12). A steel shear (8) connected to an electric telescopic rod (11) is installed inside the blowout preventer body (1) outside the movable cavity (12). A first fixing plate (4) is provided on the top of the inner wall of the movable cavity (12). A double-acting screw (5) is provided on the inner side of the first fixing plate (4). A U-shaped part (6) is movably connected to the surface of the double-acting screw (5). A first limiting ring is provided on the inner side of the U-shaped part (6). (7) One end of the bidirectional lead screw (5) is provided with a gear assembly that connects the steel shears (8) to the bidirectional lead screw (5). The gear assembly includes a rotating shaft (13), a first gear (14), a first bevel gear (15), a second bevel gear (16), a second gear (18), and a gear plate (19). The second bevel gear (16) is located at the outer end of the bidirectional lead screw (5). The rotating shaft (13) is rotatably connected to the inside of the blowout preventer body (1) below the second bevel gear (16). The top end of the rotating shaft (13) is provided with the first gear (14). The upper surface of the first gear (14) is provided with a first bevel gear (15) that meshes with the second bevel gear (16). The side surface of the steel shears (8) is provided with a toothed plate (19). A second gear (18) is provided between the toothed plate (19) and the first gear (14). A rotating rod (17) is provided on the upper surface of the second gear (18). A limit assembly is provided at the top of the rotating rod (17). The limit assembly includes a second limit ring (20), a movable locking block (26), and a second fixing plate (21). The second limit ring (20) The second limit ring (20) is set at the top of the rotating rod (17). The upper surface of the second limit ring (20) is movably connected to the movable locking block (26). The upper surface of the blowout preventer body (1) on one side of the second limit ring (20) is provided with a second fixing plate (21). The interior of the second fixing plate (21) is provided with a slot (22) that matches the movable locking block (26). The rotating rod (17) can be driven by the second limit ring (20) to move the second gear (18) downward, thereby disengaging the steel shears (8) from the double-acting screw (5). At this time, the steel shears (8) can be operated alone.

2. A blowout preventer with a wide flange body according to claim 1, characterized in that: The U-shaped part (6) has a screw hole inside that matches the bidirectional lead screw (5), and the inner wall of the first limiting ring (7) has a friction surface (27).

3. A blowout preventer with a wide flange body according to claim 2, characterized in that: The upper surface of the steel shears (8) is provided with a movable plate (10) at the outer end, and the outer side of the blowout preventer body (1) is provided with a guide rod (9). The movable plate (10) is provided with a movable hole (29) that matches the guide rod (9). The steel shears (8) is movably connected to the blowout preventer body (1) through the guide rod (9) provided in the movable hole (29).

4. A blowout preventer with a wide flange body according to claim 3, characterized in that: The guide rod (9) is provided with a limiting plate (28) at its outer end, and the outer diameter of the limiting plate (28) is larger than the inner diameter of the movable hole (29).

5. A blowout preventer with a wide flange body according to claim 4, characterized in that: The upper surface of the second limiting ring (20) is provided with a sliding groove (23), the inner wall of the sliding groove (23) is provided with a guide rail (24), the side surface of the movable block (26) is provided with a movable groove (30) that matches the guide rail (24), and the movable block (26) is movably connected to the sliding groove (23) through the guide rail (24) provided in the movable groove (30).

6. A blowout preventer with a wide flange body according to claim 5, characterized in that: The upper surface of the active card block (26) is provided with an operating ball (25).

7. A method of using a blowout preventer with a wide flange as described in claim 6, characterized in that: The steps are as follows: S1: First, the worker installs the blowout preventer on the top of the borehole (2). Then, when it is necessary to seal the borehole, the electric telescopic rod (11) is used to drive the steel shears (8) to cut the drill pipe inside the borehole (2). While the electric telescopic rod (11) drives the steel shears (8) to cut, the toothed plate (19) on the surface of the steel shears (8) drives the second gear (18) to rotate, causing the first gear (14) to rotate, thus realizing the rotation of the first bevel gear (15). Through the first bevel gear (15) driving the second bevel gear (16) to rotate, the double-acting screw (5) rotates, thus realizing the U-shaped part (6) on the surface of the double-acting screw (5) drives the first limiting ring (7) to move in opposite directions, thus limiting the drill pipe. S2: After the blowout preventer seals the borehole (2), the second limiting ring (20) can cause the rotating rod (17) to drive the second gear (18) to move downward, so that the second gear (18) disengages from the toothed plate (19), thereby disengaging the steel shears (8) from the double-acting screw (5). Then, the operating ball (25) moves the locking block (26) so that the locking block (26) engages with the corresponding slot (22). At this time, the steel shears (8) can be operated alone without affecting the first limiting ring (7). Conversely, the second limiting ring (20) causes the rotating rod (17) to drive the second gear (18) to move upward, so that the second gear (18) meshes with the toothed plate (19), thereby connecting the steel shears (8) to the double-acting screw (5). Then, the operating ball (25) moves the locking block (26) so that the locking block (26) engages with the corresponding slot (22).

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