Double-ram cooperative shear blowout preventer

Abstract

The application provides a double-gate-plate cooperative shearing blowout preventer, and relates to the technical field of leak-proof equipment.The blowout preventer comprises a blowout preventer body, a gate seal air cylinder is vertically fixed and installed in the middle part of the side wall of one end of the blowout preventer body, sealing drive members are symmetrically arranged left and right in the inner cavity of the blowout preventer body with the gate seal air cylinder as the center, sealing guide columns are connected to the sealing drive members, the two sealing guide columns are linearly opposite, sealing gate plates are arranged at the inner ends of the sealing guide columns, and the sealing gate plates are used for sealing and clamping a drill rod.The blowout preventer integrates multiple functions such as sealing, clamping and shearing, and effectively reduces the overall occupied space of the equipment by reasonably arranging the components, for example, the gate seal air cylinder is vertically fixed in the middle part of the side wall of one end of the blowout preventer body, the shearing device is butt-jointed to the upper end of the blowout preventer body through a flange plate, the clamping box is fixedly butt-jointed to the lower end of the blowout preventer body, and the like, so that the blowout preventer is convenient to install and use on a drilling platform and the space utilization rate is improved.

Description

Technical Field

[0001] This invention relates to the field of leak prevention equipment technology, and in particular to a dual-gate cooperative shear blowout preventer. Background Technology

[0002] As a core piece of equipment for preventing blowouts in oil and gas drilling, the performance and reliability of blowout preventers directly affect the safety and efficiency of drilling operations. In existing technologies, traditional blowout preventers generally suffer from unreasonable structural design: most devices require multiple independent power sources to drive the sealing and clamping mechanisms separately. This not only leads to a complex overall structure and high manufacturing costs, but also makes coordinated control of multiple power sources difficult, easily resulting in asynchronous sealing and clamping actions, leading to safety hazards such as delayed sealing and untimely clamping. Some blowout preventers lack reliable interlocking mechanisms; after the sealing gate clamps the drill pipe, the clamping mechanism is easily loosened by drilling vibrations and other factors, failing to maintain a stable clamping state for a long time, seriously affecting the blowout prevention effect. At the same time, existing clamping components often use flat or simple curved surface designs, resulting in insufficient contact with the drill pipe and poor anti-slip performance, easily causing drill pipe slippage during drilling, further reducing clamping reliability. Furthermore, the coordination between the emergency shearing mechanism and the sealing and clamping mechanism is insufficient, making it difficult to respond quickly in extreme blowout situations and unable to cut off the drill pipe in time to curb the escalation of the accident. Summary of the Invention

[0003] This invention relates to a dual-gate coordinated shear blowout preventer, which uses a single power source, a gate cylinder, and precise mechanical linkages such as crank-lever transmission, linkage guide block drive, and magnetic mechanical interlock to automatically and sequentially complete the drill pipe sealing, clamping, and locking actions. The shearer can be started independently according to emergency needs, ensuring the reliability and efficiency of blowout prevention.

[0004] This invention provides a dual-gate cooperative shear blowout preventer, specifically comprising: a blowout preventer body; a gate sealing cylinder vertically fixedly installed in the middle of one end side wall of the blowout preventer body; symmetrically arranged sealing drive components centered on the gate sealing cylinder within the inner cavity of the blowout preventer body, with sealing guide posts connected to the sealing drive components, the two sealing guide posts being linearly opposite each other, and a sealing gate plate provided at the inner end of the sealing guide post for sealing and clamping drill pipe; a shearing device connected to the upper end of the blowout preventer body via a flange; a clamping box fixedly connected to the lower end of the blowout preventer body; a drill pipe clamping mechanism provided in the clamping box for clamping drill pipe during a blowout; vertical top locking frames fixedly installed in the middle of the left and right side walls of the clamping box, and a cooperative guide block perpendicular to the top locking frame provided at the bottom of the inner cavity of the blowout preventer body above the top locking frame, the inner end of the cooperative guide block being fixedly connected to the sealing guide post via a vertically upward lifting block.

[0005] Optionally, inspection windows are provided on the left and right side walls of the blowout preventer body, and the end of the inner cavity of the blowout preventer body away from the gate sealing cylinder is a rectangular closed cavity. The closed cavity is vertically connected to the inner cavity of the blowout preventer body and the clamping box. The drill rod passes vertically through the closed cavity, and the inner cavity of the blowout preventer body has a concave structure with the closed cavity as the center.

[0006] Optionally, the piston rod end of the gate sealing cylinder is placed in the inner cavity of the blowout preventer body, and a connector is fixedly connected to the piston rod end of the gate sealing cylinder. The left and right ends of the connector are respectively rotatably connected to connecting arms via pins.

[0007] Optionally, the sealing drive is vertically rotatably installed in the blowout preventer body. A horizontal drive arm is rotatably installed on the sealing drive. One end of the drive arm is rotatably connected to the end of the connecting arm via a pin. The other end of the drive arm is provided with a vertically downward insertion shaft. The drive arm is a folded plate structure bent at 150 degrees. The lever arm at the end of the drive arm connected to the connecting arm is longer than the lever arm at the other end, and the included angle of the drive arm faces inward. The piston rod of the gate sealing cylinder retracts, causing the connecting arm to move outward. The connecting arm supports the connecting end of the drive arm, and the insertion shaft end of the drive arm moves inward, forming a crank-lever composite mechanism.

[0008] Optionally, the shearer is provided with shearing cylinders at its left and right ends respectively. The shearing cylinders and the gate sealing cylinders are distributed in a perpendicular direction. The inner end of the shearing cylinder is connected to a shearing gate plate. The two shearing gate plates are aligned in a straight line to cut off the drill rod in the middle.

[0009] Optionally, the sealing guide post is provided with two spaced annular liner plates, the insertion shaft is located between the two liner plates, the inner end of the sealing guide post is fixedly connected to a sealing gate plate, the sealing gate plate is vertically slidably placed in the side wall of the closed cavity, the insertion shaft end of the drive arm moves inward to drive the sealing guide post to move inward, and the inward movement of the sealing gate plate closes the drill rod around.

[0010] Optionally, clamping shafts are rotatably mounted laterally at both ends of the inner cavity of the clamping box. A clamping block is vertically fixed in the middle of the clamping shaft. The clamping block has a crescent-shaped structure. Two clamping blocks are placed on both sides of the drill rod. The end of the clamping block that contacts the drill rod is an arc surface, and a groove is provided in the middle of the arc surface. Anti-slip grooves are provided on the arc surfaces on both sides of the groove. The two clamping blocks are distributed in a "V" shape with an oblique downward orientation. An inner extension arm is fixedly provided on the clamping shaft near the clamping block. The inner extension arm is distributed along the side wall of the clamping block. The end of the inner extension arm is fixedly connected to the clamping block through a coupling. An outer extension arm is vertically fixedly connected to the end of the clamping shaft through the side wall of the clamping box. The outer extension arm forms a 150-degree angle with the clamping block. A connecting plate is rotatably connected to the end of the outer extension arm. The connecting plate moves up to support the outer extension arm. The outer extension arm drives the clamping block to rotate through the clamping shaft. The end of the clamping block moves inward to clamp the drill rod. Part of the arc surface of the drill rod is in the groove of the clamping block.

[0011] Optionally, a top-locking rod is vertically slidable in the top-locking frame. A cuboid top-locking block is fixedly connected to the upper end of the top-locking rod. The inner side wall of the top-locking block is vertically tangent to the outer wall of the top-locking frame. A spring is fitted on the top-locking rod below the top-locking block. The left and right sides of the middle of the top-locking block are rotatably connected to the ends of two connecting plates, respectively. A top-locking tongue is vertically upward at the upper end of the top-locking block. The upper end of the top-locking tongue slides vertically through the bottom plate of the blowout preventer body. A cuboid strip-shaped limiting magnetic block is slidably inserted into the upper end of the top-locking tongue facing away from the clamping box. An movable hole is opened at the top of the top-locking tongue above the limiting magnetic block along the direction of movement of the limiting magnetic block. A directional pin is vertically screwed to the upper end of the limiting magnetic block. The upper end face of the directional pin is lower than the upper end of the movable hole. An internal hexagonal wrench hole is provided in the upper end face of the directional pin.

[0012] Optionally, the bottom of the cooperating guide block is provided with a U-shaped groove, the upper end face of the top locking tongue is tangent to the groove, a locking groove is provided on the side of the groove away from the drill rod, the locking groove fits with the upper end of the top locking tongue, an adjustment hole is vertically provided through the groove wall at the end of the locking groove away from the drill rod, a magnetic strip is provided in the adjustment hole, the end face size of the magnetic strip is consistent with the end face size of the limiting magnetic block, and the magnetic strip and the limiting magnetic block have opposite magnetism, an adjustment screw is vertically screwed to the outer end of the cooperating guide block, the inner end of the adjustment screw is perpendicular to the outer end of the magnetic strip. When the rotating phase is engaged, and the sealing gate is not clamped, the top locking tongue is stopped by the cooperating guide block, and the top locking block is at its lowest position, meaning the clamping block is not clamped. The internal cavity of the clamping box is unobstructed, the drill rod is free, the sealing gate is clamped, the cooperating guide block moves inward, the upper end of the top locking tongue is inserted into the locking groove, and the limiting magnetic block on the top locking tongue is attracted by the magnetic strip and extends out into the adjustment hole. The top locking tongue and the cooperating guide block interlock, the sealing gate seals the drill rod, and the clamping block clamps the drill rod.

[0013] This invention provides a dual-gate synergistic shear blowout preventer, which has the following beneficial effects: This blowout preventer integrates multiple functions such as sealing, clamping, and shearing. By rationally arranging the components, such as vertically fixing the gate cylinder to the middle of one side wall of the blowout preventer body, connecting the shearer to the upper end of the blowout preventer body via a flange, and fixing the clamping box to the lower end of the blowout preventer body, the overall space occupied by the equipment is effectively reduced, making it easier to install and use on the drilling platform and improving space utilization.

[0014] In terms of operational coordination, the device achieves a high degree of automation and sequential operation. Using a gate cylinder as a single power source, a sophisticated mechanical linkage system automatically and sequentially completes the sealing of the gate, the clamping of the clamping block, and the interlocking between the top locking tongue and the cooperating guide block. When the piston rod of the gate cylinder retracts, it pulls the drive arm via the connector and connecting arm. The drive arm, acting as a crank-lever composite mechanism, pushes the sealing guide post inward, causing the gate to seal the annular space of the drill pipe. Simultaneously, the sealing guide post, through the lifting block, drives the cooperating guide block inward, achieving interlocking between the top locking tongue and the cooperating guide block, which in turn causes the clamping block to clamp the drill pipe. This series of actions is coherent and orderly, greatly improving operational efficiency and accuracy, reducing errors and delays that may be caused by manual intervention, and effectively enhancing the response speed for blowout prevention.

[0015] In terms of sealing and clamping performance, the sealing gate slides vertically within the sealed cavity sidewall, tightly fitting the drill pipe and effectively sealing the annular space around it. This prevents fluid leakage during blowouts and ensures drilling safety. The clamping blocks are designed with a crescent shape; their grooves and anti-slip grooves ensure a tight fit with the drill pipe surface. Two V-shaped clamping blocks work together to provide a stable and powerful clamping force, ensuring reliable clamping of the drill pipe under complex conditions such as blowouts and preventing the danger of drill pipe loss of control.

[0016] In terms of the interlocking mechanism, the top locking tongue and the cooperating guide block are mechanically interlocked by magnetic force. When the top locking tongue is embedded in the locking groove of the cooperating guide block, the limiting magnetic block is attracted by the opposite magnetic force of the magnetic strip, extends out and embeds into the adjustment hole, forming a reliable lock. This interlocking mechanism enhances the stability and reliability of the device during operation, prevents loosening or failure during sealing and clamping, and further ensures the effectiveness of blowout prevention.

[0017] Furthermore, the inspection window on the blowout preventer body provides operators with convenient access to observe the working status of internal components, enabling timely detection and maintenance of potential problems, extending the equipment's service life and reducing maintenance costs. The independently operating shear at the top can quickly cut the drill pipe in emergencies, providing additional safety for blowout control and ensuring timely control of the situation in extreme circumstances, minimizing losses. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0019] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0020] In the attached diagram: Figure 1 A schematic diagram of the first axial view structure of the present invention is shown; Figure 2 A schematic diagram of the second axial view structure of the present invention is shown; Figure 3 A schematic diagram of the shearer of the present invention in a semi-sectioned state is shown. Figure 4 A schematic axial view of the blowout preventer body top plate in a separated state is shown. Figure 5 This diagram shows an axial view of the blowout preventer body top plate in the removed state according to the present invention. Figure 6 A schematic diagram of the upper axial view of the collaborative guide block and top locking frame portion of the present invention is shown; Figure 7 A lower axial view of the collaborative guide block and top locking frame portion of the present invention is shown; Figure 8 This diagram shows a schematic axial view of the phase-separated structure of the cooperative guide block and top locking frame of the present invention. Figure 9 A schematic diagram of the partial cross-sectional separation structure of the collaborative guide block of the present invention is shown; Figure 10 A schematic diagram of the half-section separation structure of the clamping box of the present invention is shown; Figure 11 The present invention is shown Figure 10 Schematic diagram of the A-section of the middle section.

[0021] List of reference numerals in the attached diagram: 1. Blowout Preventer Body; 101. Inspection Window; 102. Sealed Chamber; 2. Gate Cylinder; 201. Connector; 202. Connecting Arm; 3. Shearer; 301. Shear Cylinder; 302. Shear Gate; 4. Clamping Box; 401. Clamping Shaft; 4011. Inner Extension Arm; 402. Clamping Block; 4021. Anti-slip Groove; 403. Outer Extension Arm; 404. Connecting Plate; 5. Sealing Drive Component; 501. Drive Arm; 502. 6. Insert shaft; 7. Sealing guide post; 8. Liner plate; 9. Sealing gate; 10. Cooperative guide block; 11. Lifting block; 12. Slide groove; 13. Lock groove; 14. Magnetic strip; 15. Adjusting screw; 16. Adjusting hole; 17. Top lock frame; 18. Top lock rod; 19. Top lock connecting block; 10. Spring; 10. Top lock tongue; 11. Movable hole; 12. Limiting magnetic block; 13. Directional shaft pin. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please refer to Figures 1 to 11 : Example 1: This invention proposes a dual-gate cooperative shearing blowout preventer, comprising: a blowout preventer body 1; a gate sealing cylinder 2 vertically fixedly installed in the middle of one end side wall of the blowout preventer body 1; symmetrically arranged sealing drive members 5 with the gate sealing cylinder 2 as the center in the inner cavity of the blowout preventer body 1, with sealing guide posts 6 connected to the sealing drive members 5, the two sealing guide posts 6 being linearly opposite each other, and a sealing gate 602 provided at the inner end of the sealing guide post 6, the sealing gate 602 being used to seal and clamp the drill pipe; the blowout preventer body 1... The upper end is connected to the shearing device 3 via a flange; the lower end of the blowout preventer body 1 is fixedly connected to the clamping box 4; the clamping box 4 is equipped with a drill pipe clamping mechanism, which is used to clamp the drill pipe when a blowout occurs; vertical top lock frames 8 are fixedly installed in the middle of the left and right side walls of the clamping box 4 respectively; the bottom of the inner cavity of the blowout preventer body 1 above the top lock frame 8 is provided with a cooperating guide block 7 perpendicular to the top lock frame 8; the inner end of the cooperating guide block 7 is fixedly connected to the sealing guide post 6 via a vertically upward lifting block 701.

[0024] The blowout preventer body 1 has inspection windows 101 on the left and right side walls respectively. The middle part of the blowout preventer body 1, away from the gate cylinder 2, is a rectangular closed cavity 102. The closed cavity 102 is vertically connected to the inner cavity of the blowout preventer body 1 and the clamping box 4. The drill rod passes vertically through the closed cavity 102. The inner cavity of the blowout preventer body 1 has a concave structure with the closed cavity 102 as the center.

[0025] The piston rod end of the gate sealing cylinder 2 is placed in the inner cavity of the blowout preventer body 1, and the piston rod end of the gate sealing cylinder 2 is fixedly connected to the connector 201. The left and right ends of the connector 201 are respectively rotatably connected to the connecting arm 202 through the pin.

[0026] The sealing drive component 5 is vertically rotatably installed in the blowout preventer body 1. A horizontal drive arm 501 is rotatably installed on the sealing drive component 5. One end of the drive arm 501 is rotatably connected to the end of the connecting arm 202 through a pin. The other end of the drive arm 501 is provided with a vertically downward insertion shaft 502. The drive arm 501 is a folded plate structure bent at 150 degrees. The lever arm of the end of the drive arm 501 connected to the connecting arm 202 is longer than the lever arm of the other end, and the included angle of the drive arm 501 faces inward. The piston rod of the gate sealing cylinder 2 retracts, causing the connecting arm 202 to move outward. The connecting arm 202 supports the connecting end of the drive arm 501, and the insertion shaft 502 end of the drive arm 501 moves inward, forming a crank-lever composite mechanism.

[0027] Among them, shearing cylinders 301 are provided at the left and right ends of shearer 3, and shearing cylinders 301 and gate sealing cylinder 2 are distributed in a perpendicular direction. The inner end of shearing cylinder 301 is connected to shearing gate 302. The two shearing gates 302 are aligned in a straight line to cut the drill rod in the middle.

[0028] The sealing guide post 6 is provided with two spaced annular liner plates 601, the insert shaft 502 is located between the two liner plates 601, the inner end of the sealing guide post 6 is fixedly connected to the sealing gate plate 602, the sealing gate plate 602 is vertically slidably placed in the side wall of the closed cavity 102, the insert shaft 502 end of the drive arm 501 moves inward to drive the sealing guide post 6 to move inward, and the sealing gate plate 602 moves inward to close the drill pipe around.

[0029] The clamping box 4 has two clamping shafts 401 mounted laterally at its front and rear ends. A clamping block 402 is vertically fixed in the middle of the clamping shaft 401. The clamping block 402 has a crescent-shaped structure and is positioned on both sides of the drill rod. The end of the clamping block 402 that contacts the drill rod is an arc surface with a groove in the middle. Anti-slip grooves 4021 are provided on the arc surfaces on both sides of the groove. The two clamping blocks 402 are arranged in a downward-sloping "V" shape. An inner extension arm 4011 is fixed on the clamping shaft 401 near the clamping block 402. The inner extension arm 4011 extends along the clamping shaft 401... The sidewall of the holding block 402 is distributed with the end of the inner extension arm 4011 fixedly connected to the holding block 402 by a coupling; the end of the clamping shaft 401 extends through the sidewall of the clamping box 4 and is vertically fixedly connected to the outer extension arm 403. The outer extension arm 403 forms a 150-degree angle with the clamping block 402. The end of the outer extension arm 403 is rotatably connected to the connecting plate 404. The connecting plate 404 moves upward to support the outer extension arm 403. The outer extension arm 403 drives the clamping block 402 to rotate through the clamping shaft 401. The end of the clamping block 402 moves inward to clamp the drill rod. Part of the arc surface of the drill rod is in the groove of the clamping block 402.

[0030] The top lock frame 8 includes a vertically sliding top lock rod 801. A cuboid top lock block 802 is fixedly connected to the upper end of the top lock rod 801. The inner sidewall of the top lock block 802 is vertically tangent to the outer wall of the top lock frame 8. A spring 803 is fitted onto the top lock rod 801 below the top lock block 802. The left and right sides of the middle of the top lock block 802 are rotatably connected to the ends of two connecting plates 404. A top lock tongue 804 is vertically upwardly positioned at the upper end of the top lock block 802. A rectangular strip-shaped limiting magnetic block 805 is slidably inserted into the top of the top locking tongue 804, which is slidably inserted into the side away from the clamping box 4. An movable hole 8041 is opened on the top of the top locking tongue 804 above the limiting magnetic block 805 along the moving direction of the limiting magnetic block 805. A directional shaft pin 8051 is vertically screwed to the upper end of the limiting magnetic block 805. The upper end face of the directional shaft pin 8051 is lower than the upper end of the movable hole 8041. An internal hexagonal wrench hole is provided in the upper end face of the directional shaft pin 8051.

[0031] In Example 2, based on Example 1, the bottom of the cooperating guide block 7 is provided with a U-shaped groove 702. The upper end face of the top locking tongue 804 is tangent to the groove 702. A locking groove 703 is provided on the side of the groove 702 away from the drill rod. The locking groove 703 fits with the upper end of the top locking tongue 804. An adjustment hole 706 is vertically provided through the groove wall of the end of the locking groove 703 away from the drill rod. A magnetic strip 704 is provided in the adjustment hole 706. The end face size of the magnetic strip 704 is consistent with the end face size of the limiting magnetic block 805, and the magnetic strip 704 and the limiting magnetic block 805 have different magnetic properties. An adjustment screw 705 is vertically screwed to the outer end of the cooperating guide block 7. The inner end of the adjustment screw 705 is connected to the magnetic strip 704. When the outer end of the strip 704 rotates vertically and engages, and the sealing gate 602 is not clamped, the top locking tongue 804 is stopped by the cooperating guide block 7, and the top locking connecting block 802 is at the lowest position, that is, the clamping block 402 is not clamped. The inner cavity of the clamping box 4 is unobstructed, the drill rod is free, the sealing gate 602 is clamped, the cooperating guide block 7 moves inward, the upper end of the top locking tongue 804 is inserted into the locking groove 703, and the limiting magnetic block 805 on the top locking tongue 804 is attracted by the magnetic strip 704 and extends out and is embedded in the adjustment hole 706. The top locking tongue 804 and the cooperating guide block 7 are interlocked, the sealing gate 602 seals the drill rod, and the clamping block 402 clamps the drill rod.

[0032] The following further explains and illustrates the function and effect of each structure mentioned above, so that those skilled in the art can better understand the technical solution: A gate cylinder 2, serving as the core drive source, is vertically fixedly installed in the middle of the side wall of one end of the blowout preventer body 1. The piston rod end of the gate cylinder 2 is connected to a connector 201 and connected to a drive arm 501 on a pair of sealing drive components 5 via a connecting arm 202. The drive arm 501 is designed as a crank-lever composite mechanism with a 150-degree bend. When its long lever arm end is supported externally by the connecting arm 202, the insertion shaft 502 at its short lever arm end will move inward.

[0033] The inward movement of the insertion shaft 502 directly pushes the sealing guide posts 6 on both sides toward the center. The sealing guide post 6 is provided with a liner 601 for guiding and limiting, and a sealing gate 602 is fixedly connected to its inner end. When the sealing guide post 6 is driven to move inward, the sealing gate 602 slides within the side wall of the enclosed cavity 102, thereby achieving an annular space seal for the centered drill pipe. Simultaneously, the movement of the sealing guide post 6 is transmitted to the cooperating guide block 7 at its bottom via the vertically upward lifting block 701, causing the cooperating guide block 7 to move inward synchronously.

[0034] The bottom of the cooperating guide block 7 is provided with a sliding groove 702 and a locking groove 703. In the initial state, the top locking tongue 804, which is fixed to the upper end of the top locking rod 801, is stopped by the sliding groove 702 of the cooperating guide block 7. The top locking rod 801 can slide vertically in the top locking frame 8, and the top locking connecting block 802 on it is pressed into the lower position by the spring 803. At this time, the clamping mechanism connected to the top locking connecting block 802 through the connecting plate 404 is in the loose state. When the cooperating guide block 7 moves inward and its locking groove 703 aligns with the top locking tongue 804, the top locking tongue 804 springs up under the action of the spring force and is embedded in the locking groove 703. At this time, the limiting magnetic block 805 at the upper end of the top locking tongue 804 is attracted by the opposite magnetic force of the magnetic strip 704 in the adjustment hole 706 of the cooperating guide block 7 and extends out, embedding itself in the adjustment hole 706, forming a reliable magnetic mechanical interlock.

[0035] The upward movement of the top locking tongue 804 causes the top locking connecting block 802 to rise, which in turn pulls the outer extension arm 403 through the connecting plate 404. The rotation of the outer extension arm 403 causes the clamping shaft 401 to rotate, and the clamping block 402 fixed on the clamping shaft 401 closes inward accordingly. The clamping block 402 is designed with a crescent-shaped structure, and the grooves and anti-slip grooves 4021 on its arc surface can effectively hold the drill pipe. The two clamping blocks 402 are distributed in a V-shape, which together form a stable clamping of the drill pipe.

[0036] In addition, the shearer 3 connected to the upper part of the blowout preventer body 1 via a flange operates independently. Driven by a shearing cylinder 301, it operates a shearing gate 302 to cut the drill pipe in emergency situations. The clamping box 4 at the lower end of the blowout preventer body 1 houses the entire clamping mechanism. An inspection window 101 on the blowout preventer body 1 facilitates observation and maintenance of the internal components.

[0037] In summary, this device, through a single power source—the sealing cylinder 2—automatically and sequentially achieves the sealing of the sealing gate 602, the clamping of the clamping block 402, and the interlocking between the top locking tongue 804 and the cooperating guide block 7 via a precise mechanical linkage.

[0038] Working principle: The blowout preventer body 1 serves as the core installation carrier. The gate cylinder 2, located in the middle of one side wall, provides the core power for the device's sealing and clamping actions. When a blowout occurs, the piston rod of the gate cylinder 2 retracts, causing the connector 201 to move synchronously. The connector 201 pulls the connecting arm 202 outward via pins at both ends. The end of the connecting arm 202 is externally supported by a pin on the drive arm 501 of the sealing drive component 5. The drive arm 501 is a crank-lever composite mechanism bent at 150 degrees. After the long lever end connected to the connecting arm 202 is subjected to external support force, the insertion shaft 502 at the short lever end moves inward. The insertion shaft 502 is positioned between the two bushings 601 of the sealing guide post 6, thereby pushing the two sealing guide posts 6 to move synchronously inward towards the center. The sealing gate plate 602 at the inner end of the sealing guide post 6 slides vertically within the side wall of the sealed cavity 102, ultimately achieving a seal around the annular space of the drill pipe passing through the sealed cavity 102. During the inward movement of the sealing guide post 6, it drives the cooperating guide block 7 to move inward synchronously through the vertically upward lifting block 701. In the initial state, the sliding groove 702 of the cooperating guide block 7 stops the top locking tongue 804. Under the pressure of the spring 803, the top locking rod 801 in the top locking frame 8 keeps the top locking connecting block 802 at its lowest position. At this time, the clamping mechanism in the clamping box 4 remains in a loose state, and the drill rod can move freely. When the cooperating guide block 7 moves inward to the position where the locking groove 703 is aligned with the top locking tongue 804, the top locking tongue 804 moves vertically upward under the elastic force of the spring 803 and inserts into the locking groove 703. At the same time, the limiting magnetic block 805 at the upper end of the top locking tongue 804 is attracted by the opposite magnetic force of the magnetic strip 704 in the adjustment hole 706 of the cooperating guide block 7, extends outward along the movable hole 8041 and is embedded in the adjustment hole 706, realizing reliable interlocking between the top locking tongue 804 and the cooperating guide block 7. As the top locking tongue 804 moves upward, it drives the top locking connecting block 802 to rise synchronously. The top locking connecting block 802 pulls the outer extension arm 403 of the clamping box 4 through the connecting plate 404 that is rotatably connected at both ends. The outer extension arm 403 and the clamping block 402 form a 150-degree angle. Under the pulling force of the connecting plate 404, it drives the clamping shaft 401 to rotate. The crescent-shaped clamping block 402 in the middle of the clamping shaft 401 then closes inward. The two clamping blocks 402 distributed in a V shape fit against the surface of the drill rod through the groove in the middle of the arc surface. The anti-slip grooves 4021 on both sides of the groove enhance the clamping friction, and finally achieve stable clamping of the drill rod. The shearer 3 at the upper end of the blowout preventer body 1 independently completes the shearing action. When it is necessary to cut the drill pipe urgently, the shearing cylinder 301 drives the shearing gates 302 at both ends to move towards the center, quickly cutting off the drill pipe in the middle. The inspection windows 101 at both ends of the blowout preventer body 1 make it easy for operators to observe the working status of the internal components and perform maintenance. The entire device is powered by a single gate cylinder 2, and through precise mechanical linkage such as crank-lever transmission, linkage guide block drive, and magnetic mechanical interlock, it automatically and sequentially completes the drilling pipe sealing, clamping and locking actions. The shearer 3 can be started independently according to emergency needs to ensure the reliability and efficiency of blowout prevention and control.

[0039] The following points should be noted in this article: 1. The accompanying drawings of the embodiments of the present invention only involve the structures involved in the embodiments of the present invention; other structures can refer to general designs.

[0040] 2. Where there is no conflict, the embodiments of the present invention and the features thereof can be combined with each other to obtain new embodiments.

[0041] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A dual-gate cooperative shear blowout preventer, comprising: A blowout preventer body (1); a gate cylinder (2) is vertically fixed in the middle of one side wall of the blowout preventer body (1); characterized in that, a sealing drive (5) is symmetrically arranged on the left and right sides of the inner cavity of the blowout preventer body (1) with the gate cylinder (2) as the center, and a sealing guide post (6) is connected to the sealing drive (5), the two sealing guide posts (6) are straight and opposite to each other, and a sealing gate plate (602) is provided at the inner end of the sealing guide post (6), the sealing gate plate (602) is used to seal and clamp the drill rod; the upper end of the blowout preventer body (1) is connected to the shearer (3) through a flange; the lower end of the blowout preventer body (1) is fixed The clamping box (4) is fixedly connected to the well; the clamping box (4) is equipped with a drill pipe clamping mechanism, which is used to clamp the drill pipe when a blowout occurs; vertical top lock frames (8) are fixedly provided in the middle of the left and right side walls of the clamping box (4); a cooperating guide block (7) perpendicular to the top lock frame (8) is provided at the bottom of the inner cavity of the blowout preventer body (1) above the top lock frame (8); the inner end of the cooperating guide block (7) is fixedly connected to the sealing guide post (6) through a vertically upward lifting block (701); clamping shafts (401) are installed laterally at the front and rear ends of the inner cavity of the clamping box (4); the clamping shafts (401) are installed laterally. A clamping block (402) is vertically fixed in the middle of the top lock frame (8); a top lock rod (801) is vertically slidably provided in the top lock frame (8), and a cuboid top lock connecting block (802) is fixedly connected to the upper end of the top lock rod (801). The inner side wall of the top lock connecting block (802) is vertically tangent to the outer wall of the top lock frame (8). A spring (803) is fitted on the top lock rod (801) below the top lock connecting block (802). The left and right sides of the middle of the top lock connecting block (802) are rotatably connected to the ends of two connecting plates (404) respectively. A top lock tongue (804) is vertically upward provided at the upper end of the top lock connecting block (802). The upper end of the locking tongue (804) slides vertically through the bottom plate of the blowout preventer body (1). A rectangular strip-shaped limiting magnetic block (805) is slidably inserted into the upper end of the top locking tongue (804) towards the side away from the clamping box (4). An active hole (8041) is opened on the top of the top locking tongue (804) above the limiting magnetic block (805) along the active direction of the limiting magnetic block (805). A directional pin (8051) is vertically screwed to the upper end of the limiting magnetic block (805). The upper end face of the directional pin (8051) is lower than the upper end of the active hole (8041). An internal hexagonal wrench hole is provided in the upper end face of the directional pin (8051).The bottom of the cooperating guide block (7) is provided with a U-shaped groove (702). The upper end face of the top locking tongue (804) is tangent to the groove (702). A locking groove (703) is provided on the side of the groove (702) away from the drill rod. The locking groove (703) fits with the upper end of the top locking tongue (804). An adjustment hole (706) is vertically provided through the groove wall at the end of the locking groove (703) away from the drill rod. A magnetic strip (704) is provided in the adjustment hole (706). The end face size of the magnetic strip (704) is consistent with the end face size of the limiting magnetic block (805). The magnetic strip (704) and the limiting magnetic block (805) have different magnetic properties. An adjustment screw (705) is vertically screwed to the outer end of the cooperating guide block (7). The inner end of the adjustment screw (705) is connected to the magnetic strip (704). When the outer end rotates vertically and engages with the locking mechanism, and the sealing gate (602) is not clamped, the top locking tongue (804) is stopped by the cooperating guide block (7), and the top locking connecting block (802) is at its lowest position, i.e., the clamping block (402) is not clamped. The inner cavity of the clamping box (4) is unobstructed, the drill rod is free, and the sealing gate (602) is clamped. The cooperating guide block (7) moves inward, and the upper end of the top locking tongue (804) is inserted into the locking groove (703). The limiting magnetic block (805) on the top locking tongue (804) is attracted by the magnetic strip (704) and extends out into the adjusting hole (706). The top locking tongue (804) and the cooperating guide block (7) interlock, the sealing gate (602) seals the drill rod, and the clamping block (402) clamps the drill rod.

2. The dual-gate synergistic shear blowout preventer according to claim 1, characterized in that, Inspection windows (101) are provided on the left and right side walls of the blowout preventer body (1). The middle part of the blowout preventer body (1) away from the gate cylinder (2) is a rectangular closed cavity (102). The closed cavity (102) is vertically connected to the inner cavity of the blowout preventer body (1) and the clamping box (4). The drill rod passes vertically through the closed cavity (102). The inner cavity of the blowout preventer body (1) has a concave structure with the closed cavity (102) as the center.

3. The dual-gate synergistic shear blowout preventer according to claim 1, characterized in that, The piston rod end of the gate sealing cylinder (2) is placed in the inner cavity of the blowout preventer body (1), and the piston rod end of the gate sealing cylinder (2) is fixedly connected to a connector (201). The left and right ends of the connector (201) are respectively connected to a connecting arm (202) by a pin.

4. The dual-gate cooperative shear blowout preventer according to claim 3, characterized in that, The sealing drive (5) is vertically rotatably installed in the blowout preventer body (1). A horizontal drive arm (501) is rotatably installed on the sealing drive (5). One end of the drive arm (501) is rotatably connected to the end of the connecting arm (202) through a pin. The other end of the drive arm (501) is provided with a vertically downward insertion shaft (502). The drive arm (501) is a folded plate structure bent at 150 degrees. The lever arm of the end of the drive arm (501) connected to the connecting arm (202) is longer than the lever arm of the other end. The included angle of the drive arm (501) faces inward. The piston rod of the gate sealing cylinder (2) retracts, causing the connecting arm (202) to move outward. The connecting arm (202) supports the connecting end of the drive arm (501) outward. The insertion shaft (502) end of the drive arm (501) moves inward, forming a crank-lever composite mechanism.

5. A dual-gate synergistic shear blowout preventer according to claim 1, characterized in that, The shearer (3) is provided with shearing cylinders (301) at its left and right ends respectively. The shearing cylinders (301) and the gate sealing cylinders (2) are distributed in a vertical direction. The inner end of the shearing cylinder (301) is connected to the shearing gate (302). The two shearing gates (302) are aligned in a straight line to cut off the drill rod in the middle.

6. A dual-gate synergistic shear blowout preventer according to claim 4, characterized in that, The sealing guide post (6) is provided with two spaced annular liner plates (601), and the insert shaft (502) is located between the two liner plates (601). The inner end of the sealing guide post (6) is fixedly connected to the sealing gate plate (602). The sealing gate plate (602) is vertically slidably placed in the side wall of the closed cavity (102). The insert shaft (502) end of the drive arm (501) moves inward, causing the sealing guide post (6) to move inward. The inward movement of the sealing gate plate (602) closes the drill rod around.

7. A dual-gate synergistic shear blowout preventer according to claim 1, characterized in that, The clamping block (402) has a crescent-shaped structure. Two clamping blocks (402) are placed on both sides of the drill rod. The end of the clamping block (402) that contacts the drill rod is an arc surface, and a groove is provided in the middle of the arc surface. Anti-slip grooves (4021) are provided on the arc surfaces on both sides of the groove. The two clamping blocks (402) are distributed in a "V" shape with an oblique downward orientation. An inner extension arm (4011) is fixedly provided on the clamping shaft (401) near the clamping block (402). The inner extension arm (4011) is distributed along the side wall of the clamping block (402), and the end of the inner extension arm (4011) communicates with the clamping block (402). The clamping shaft (401) is fixedly connected to the clamping box (4) by a coupling; the end of the clamping shaft (401) extends through the side wall of the clamping box (4) and is vertically fixed to an extension arm (403). The extension arm (403) forms a 150-degree angle with the clamping block (402). The end of the extension arm (403) is rotatably connected to a connecting plate (404). The connecting plate (404) moves upward to support the extension arm (403). The extension arm (403) drives the clamping block (402) to rotate through the clamping shaft (401). The end of the clamping block (402) moves inward to clamp the drill rod. Part of the arc surface of the drill rod is in the groove of the clamping block (402).

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