Full-electric controlled double-stage staggered shearing blowout preventer

Abstract

This invention discloses equipment for well control technology in oil and gas drilling, specifically a fully electrically controlled two-stage staggered shear blowout preventer (BOP), comprising a rotary clamping seal assembly, a rotary shearing seal assembly, and an electrically controlled drive assembly. The fully electrically controlled two-stage staggered shear blowout preventer has two operating modes: clamping seal mode and shearing full-seal mode. In clamping seal mode, the electrical control system drives the motor, and through the meshing transmission of a small bevel gear and a large gear, realizes the opening and closing movement of the gate, reliably sealing the wellhead and preventing fluid leakage. In shearing full-seal mode, the electrical control system controls the motor to output high torque, the small bevel gear drives the large gear to rotate, further driving the gate shearing mechanism to complete the shearing of the drill string inside the well, and relying on the fully sealed gate structure to achieve complete sealing of the wellhead. This invention employs a purely electrically controlled gear transmission method, achieving precise control of gate shearing and full sealing. This effectively improves the response speed and sealing reliability of the blowout preventer in complex working conditions and sudden blowout accidents, reduces the risk of well control failure, and is of great significance for improving drilling operation safety and the level of intelligence of well control equipment.

Description

Technical Field

[0001] This invention relates to the field of well control technology for oil and gas drilling, specifically to a fully electrically controlled two-stage offset shear blowout preventer. Background Technology

[0002] In drilling operations, blowout preventers (BOPs) are critical well control equipment, responsible for sealing the wellhead, controlling downhole pressure, and handling complex situations such as blowouts. Most existing BOPs employ traditional hydraulic drive systems. Hydraulic BOPs have several shortcomings in practical applications: their structure includes numerous hydraulic lines and a large hydraulic station, resulting in an overall large size, lack of compactness, and poor applicability. Furthermore, in the face of sudden blowouts, the process from receiving a command to establishing sufficient hydraulic pressure to push the gate is relatively long, leading to a slow response time. Moreover, with increased usage time, the complex stress environment downhole can cause problems such as pipeline aging and hydraulic oil leakage, leading to system jamming or inadequate sealing. Additionally, traditional gate-type BOPs often face insufficient thrust or easy jamming of the guide mechanism when shearing the drill string.

[0003] To effectively address these issues, a fully electrically controlled, two-stage staggered shear blowout preventer (BOP) with fast response, stable mechanical structure, and high level of intelligence has been developed. Through automatic control technology, the BOP's operation can be remotely and precisely controlled, and the purely mechanical combination of moving and stationary cutterheads and sliding grooves greatly improves operational reliability. Summary of the Invention

[0004] The purpose of this invention is to propose a fully electrically controlled two-stage staggered shear blowout preventer to solve the problems mentioned above, and to effectively improve the working stability and efficiency of the blowout preventer by combining automatic control with a mechanical moving and stationary disc guiding mechanism.

[0005] To solve the above problems, the present invention adopts the following technical solution: the fully electronically controlled dual-stage staggered shear blowout preventer includes a rotary shear sealing assembly, a rotary clamping sealing assembly, and an electronically controlled drive assembly.

[0006] The rotary shear sealing assembly is located at the top and includes a top flange, an upper housing, an upper bevel gear, an upper moving cutter disc, an upper cap, a shear gate, and an upper stationary cutter disc. The upper housing has a hexagonal groove inside, and the upper stationary cutter disc has a hexagonal outline and is directly fixed within this groove to prevent rotation. Its upper surface has five evenly distributed straight sliding grooves. The upper moving cutter disc has a large bevel gear structure on its exterior that meshes with the upper bevel gear, and its interior has five evenly distributed arc-shaped sliding grooves. The shear gate has sliding keys at the top and bottom, which engage and slide with the arc-shaped sliding grooves of the moving disc and the straight sliding grooves of the stationary disc, respectively. The upper cap and the sliding keys on the shear gate are connected by threads for positioning. When the upper moving cutter disc rotates, it drives the shear gate to slide between the discs, achieving staggered shearing.

[0007] The rotary clamping seal assembly is located at the bottom and includes a lower bevel gear, a lower moving cutter head, a lower end cap, a clamping gate, a lower stationary cutter head, a sensor, and a lower flange. The lower flange also has a hexagonal groove inside, and the lower stationary cutter head, in a hexagonal shape, is fixed within the groove to prevent rotation. Its upper surface has five evenly distributed straight sliding grooves. A large bevel gear meshes with the lower bevel gear on the outside of the lower moving cutter head, and its interior has five evenly distributed arc-shaped sliding grooves. The upper and lower sliding keys on the clamping gate engage with the arc-shaped sliding grooves of the moving cutter head and the straight sliding grooves of the stationary cutter head, respectively. The lower end cap and the sliding keys on the clamping gate are positioned by threads. When the lower moving cutter head rotates, it drives the clamping gate to slide towards the center, achieving a clamping seal.

[0008] The electronically controlled drive assembly includes a motor housing fixed to the side of the casing, housing upper and lower motors. The output shafts of the two motors are connected to upper and lower bevel gears via keys, and a mechanical dynamic seal is provided to prevent fluid intrusion from the well. The control unit is wired to the dual motors, sends commands and controls torque output, and is powered by a surface power source.

[0009] The fully electrically controlled, two-stage staggered shear blowout preventer is implemented as follows: When an action command is received, the motor drives the moving cutter head to rotate via a small bevel gear. Since the stationary cutter head is fixed in place by the hexagonal groove, the gate plate (with sliding keys on its upper and lower sides) installed between the moving and stationary cutter heads is simultaneously constrained by both the arc-shaped and straight sliding grooves. The rotation of the moving cutter head causes relative displacement of the trajectory surface of the arc-shaped groove, and the sidewall of this trajectory surface applies a normal thrust to the sliding key of the gate plate. Under the radial guidance of the straight sliding groove of the stationary cutter head, this circumferential thrust is converted into a strong radial linear thrust. During forward rotation, the eccentric trajectory of the arc-shaped groove forces each gate plate to converge synchronously towards the center, completing the clamping or shearing full-seal action using a high-strength metal tip; during reverse rotation, the arc-shaped groove pulls the gate plate outward along the straight sliding groove, realizing the opening and resetting of the gate plate.

[0010] As a further technical solution of the present invention, the fully electronically controlled dual-stage staggered shear blowout preventer has a clamping and sealing mode and a shearing and sealing mode; in the clamping and sealing mode, the control unit sends a command to drive the lower motor, and completes the torque transmission through the meshing of the lower bevel gear and the lower moving cutter disc; in the shearing and sealing mode, the control unit sends a command to control the upper motor to output high torque, and completes the powerful shearing through the meshing of the upper bevel gear and the upper moving cutter disc.

[0011] As a further technical solution of the present invention, the sliding motion of the shearing gate is achieved by the combined limiting and guiding of the upper moving cutter head arc-shaped slide groove and the upper stationary cutter head straight slide groove. When the upper moving cutter head moves, the arc-shaped slide groove inside it rotates accordingly. Through the sliding key acting on the shearing gate, the shearing gate is forced to make radial linear reciprocating motion along the straight slide groove fixed by the upper stationary cutter head, thereby completing the convergence and shearing or outward opening of the misaligned shearing gate.

[0012] As a further technical solution of the present invention, the sliding motion of the clamping gate is achieved by the combined limiting and guiding of the arc-shaped sliding groove of the lower moving cutterhead and the straight sliding groove of the lower stationary cutterhead. When the lower moving cutterhead moves, the arc-shaped sliding groove inside it acts on the sliding key on the clamping gate, forcing the clamping gate to make radial linear reciprocating motion along the straight sliding groove fixed by the lower stationary cutterhead, thereby realizing that multiple clamping gates converge at the center to clamp the drill bit or retract and open outward.

[0013] As a further technical solution of the present invention, the mechanical dynamic seal provided at the output shaft of the upper and lower motors is used to effectively isolate the fluid in the wellbore from the environment of the motor housing, and to ensure the safety of electrical components under the impact of high-pressure fluids such as blowouts; the wired connection between the upper and lower motors of the control unit is used to ensure the stability and anti-interference capability of the control signal and motor power transmission under the extreme and harsh working conditions of high interference and high vibration downhole.

[0014] As a further technical solution of the present invention, the tip of the shear gate is made of high-strength metal material to improve strength and facilitate cutting of drilling tools inside the well.

[0015] Compared with the prior art, the present invention has the following advantages: (1) The present invention adopts a pure electric gear transmission method, which completely eliminates the complex hydraulic drive pipeline; the design of the upper stationary cutter head and the lower stationary cutter head being embedded in the hexagonal groove of the housing is compact and has extremely high anti-rotation limit reliability; (2) The present invention cleverly utilizes the combined action of the arc-shaped sliding groove of the moving cutter head and the straight sliding groove of the stationary cutter head to smoothly and efficiently convert the rotational motion of the motor into the radial linear reciprocating motion of the gate, which completely solves the problem of easy jamming of the traditional push rod and the force distribution is more uniform. (3) The present invention uses a wired control unit to communicate with the motor and sets a mechanical dynamic seal at the motor output shaft, which greatly improves the safety protection level and signal transmission stability of the equipment in complex and harsh well control environments such as deep wells, high pressure, and strong vibration. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the fully electronically controlled two-stage staggered shear blowout preventer described in this invention; Figure 2 This is a schematic diagram of the rotary shear sealing assembly in the open state according to the present invention; Figure 3 This is a schematic diagram of the closed state of the rotary shear sealing assembly described in this invention; Figure 4 This is a schematic diagram of the open state of the rotary clamping sealing assembly described in this invention; Figure 5 This is a schematic diagram of the closed state of the rotary clamping sealing assembly described in this invention; Figure 6 This is a flowchart of the workflow of the present invention; In the diagram: 1-Top flange, 2-Upper housing, 3-Upper bevel gear, 4-Upper moving cutter head, 5-Upper end cap, 6-Shear gate, 7-Upper stationary cutter head, 8-Lower bevel gear, 9-Lower moving cutter head, 10-Lower end cap, 11-Clamping gate, 12-Lower stationary cutter head, 13-Sensor, 14-Lower flange, 15-Upper motor, 16-Lower motor, 17-Control unit, 18-Motor box, 19-Ground power supply. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0018] Reference Figures 1 to 6 A fully electrically controlled two-stage staggered shear blowout preventer, characterized in that: the fully electrically controlled two-stage staggered shear blowout preventer includes a rotary shear seal assembly, a rotary clamping seal assembly and an electrically controlled drive assembly.

[0019] The rotary shear sealing assembly is located on the upper part of the blowout preventer and mainly consists of a top flange 1, an upper housing 2, an upper bevel gear 3, an upper moving cutterhead 4, an upper cap 5, a shear gate 6, and an upper stationary cutterhead 7. In terms of assembly, the top flange 1 is bolted to the top of the upper housing 2 to connect to the wellhead equipment above. A hexagonal groove is machined at the bottom of the inner cavity of the upper housing 2. The outer contour of the upper stationary cutterhead 7 is a perfectly matched hexagon, directly nested and fixed within this hexagonal groove, thus achieving an extremely reliable circumferential anti-rotation function. Five straight sliding grooves are evenly arranged radially on the upper surface of the upper stationary cutterhead 7. A large bevel gear structure is machined on the outer circumference of the upper moving cutterhead 4, meshing with the upper bevel gear 3 on the side to complete the transmission. Five arc-shaped sliding grooves are evenly arranged inside the upper moving cutterhead 4. Each of the five shearing gate plates 6 has an integrally formed sliding key at both its upper and lower ends. During assembly, the shearing gate plates 6 are clamped and arranged between the upper moving cutter disc 4 and the upper stationary cutter disc 7. The upper sliding key engages with the arc-shaped groove of the upper moving cutter disc 4, and the lower sliding key engages with the straight groove of the upper stationary cutter disc 7. The upper cap 5 is connected to the sliding key on the shearing gate plate 6 by a thread to prevent detachment and ensure precise positioning. When the upper moving cutter disc 4 rotates, it drives the shearing gate plates 6 to slide between the discs, thereby realizing the opening and closing motion of staggered shearing.

[0020] The rotary clamping seal assembly is located at the lower part of the blowout preventer, and its structural principle is similar to that of the upper part. It includes a lower bevel gear 8, a lower moving cutter head 9, a lower end cap 10, a clamping gate 11, a lower stationary cutter head 12, a sensor 13, and a lower flange 14. The lower flange 14 is located at the bottom of the blowout preventer to connect to the lower wellhead, and it also has hexagonal grooves machined inside. The sensor (13) is embedded in the side wall of the central through hole inside the lower flange (14), and in terms of spatial relative position, it is directly below the lower stationary cutter head (12). The hexagonal lower stationary cutter head 12 is fixedly installed in the hexagonal groove of the lower flange 14 to prevent rotation, and its upper surface is evenly distributed with five straight sliding grooves. The lower moving cutter head 9 has a large bevel gear structure on its exterior that meshes with the lower bevel gear 8 to complete the transmission, and its interior is evenly distributed with five arc-shaped sliding grooves. Each of the five clamping gate plates 11 has a sliding key on its upper and lower sides, which engages with the arc-shaped sliding groove of the lower moving cutter head 9 and the straight sliding groove of the lower stationary cutter head 12, respectively. The lower end cap 10 and the sliding key on the clamping gate plate 11 are connected by threads for positioning. When the lower moving cutter head 9 rotates, it drives the clamping gate plate 11 to slide towards the center, thereby realizing the opening and closing movement of the clamping seal.

[0021] The electrically controlled drive assembly includes an upper motor 15, a lower motor 16, a control unit 17, a motor housing 18, and a surface power supply 19. The motor housing 18 is fixedly mounted on one side of the blowout preventer housing, with the upper motor 15 and lower motor 16 arranged vertically and installed inside it. The output shaft of the upper motor 15 is keyed to the upper bevel gear 3 to drive the rotary shear seal assembly, and a mechanical dynamic seal is provided at the point where the output shaft penetrates the housing to prevent the intrusion of high-pressure fluid from the well. The output shaft of the lower motor 16 is keyed to the lower bevel gear 8 to drive the rotary clamping seal assembly, and also has a mechanical dynamic seal. The control unit 17 is wired to the upper motor 15 and lower motor 16 to resist strong electromagnetic interference at the drilling site, and is used to send commands to precisely control the rotation and torque output of the two motors. The surface power supply 18 is connected to the control unit 17 to provide stable power to the entire blowout preventer system.

[0022] The fully electronically controlled two-stage staggered shear blowout preventer is specifically implemented as follows: Combination Figure 6 During the operation of the blowout preventer, the sensor (13) embedded in the lower flange (14) monitors the pressure and flow rate of the fluid flowing through the wellhead in real time. Meanwhile, in terms of mechanical transmission, since the upper stationary cutterhead 7 and the lower stationary cutterhead 12 are completely locked in circumferential freedom by the hexagonal grooves on their outer sides, the straight sliding grooves on their surfaces become the only displacement guide rails of the gate.

[0023] Reference Figure 4 , Figure 5 and Figure 6In the clamping and sealing mode: when the sensor (13) detects abnormal fluctuations in wellhead pressure or flow (such as early overflow) and transmits the data back in real time, and the intelligent system determines that clamping and sealing are required, the operator or system selects the clamping and sealing mode. The control unit 17 sends a command down through the wired network to drive the lower motor 16 to work. The lower motor 16 drives the lower bevel gear 8 to rotate forward through the key connection, which further drives the lower moving cutter head 9 to rotate synchronously. When the lower moving cutter head 9 rotates, the five arc-shaped sliding grooves inside its disc rotate accordingly, and the sidewalls of the sliding grooves generate a tangential thrust on the upper sliding key of the clamping gate 11. Since the lower sliding key of the clamping gate 11 is restricted in its rotational freedom by the straight sliding groove of the lower stationary cutter head 12, the tangential thrust is forcibly converted into a radial thrust along the direction of the straight sliding groove. The five clamping gates 11 move along a predetermined trajectory (from Figure 4 (In its open state) it smoothly, powerfully, and in absolute synchronicity converges towards the center (until...) Figure 5 (In the closed state), it finally fits tightly against the drill string at the center of the wellbore, achieving an effective annular clamping seal; when opened, the lower motor 16 reverses, and the arc-shaped slide groove pulls the clamping gate 11 to the outside through the sliding key to reset.

[0024] Reference Figure 2 , Figure 3 and Figure 6 In the shearing full-sealing mode: when the sensor (13) detects that the wellhead pressure has increased explosively and exceeded the limit safety threshold, and the system determines that it is in the event of a blowout or other severe working conditions and the drill string needs to be cut off urgently, the system selects the shearing full-sealing mode. In order to ensure that the shearing process is foolproof, the control unit (17) will send a command to start the lower motor (16) and the upper motor (15) at the same time. In the lower part, the lower motor (16) starts at high speed according to the aforementioned clamping logic, drives the clamping gate (11) to quickly close towards the center, first achieves annular isolation of the drill string and plays a role in strongly straightening and fixing the drill string; at the same time, in the upper part where shearing occurs, the control unit (17) outputs instantaneous high torque to the upper motor (15). The upper motor (15) drives the upper moving cutterhead (4) to rotate strongly through the upper bevel gear (3). Under the same "arc groove + straight groove" force mechanism as above, the five staggered shearing gates (6) are subjected to huge radial thrust transmitted by the arc groove, from Figure 2 The state contracts violently towards the center. Multiple shearing blades intersect at the center, generating immense shear stress, thus instantly cutting off the drill bit that was previously fixed in place by the lower gate. After cutting, the shearing gates (6) continue to intersect until... Figure 3 When the well reaches its ultimate closed state, the upper and lower sealing assemblies work together to form a double physical barrier, completely blocking the well passage and achieving a complete emergency seal at the wellhead.

[0025] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Although the present invention has been described in detail in the foregoing embodiments, those skilled in the art can still modify the above-described technical solutions. Based on these embodiments, those skilled in the art can make modifications without limitation.

Claims

1. A fully electrically controlled, two-stage staggered shear blowout preventer, characterized in that: The fully electronically controlled two-stage staggered shear blowout preventer includes a rotary shear seal assembly, a rotary clamping seal assembly, and an electronically controlled drive assembly. The rotary shear sealing assembly is located at the top and includes a top flange (1), an upper housing (2), an upper bevel gear (3), an upper moving cutter head (4), an upper cap (5), a shear gate (6), and an upper stationary cutter head (7). The top flange (1) is bolted to the top of the upper housing (2) to connect to the upper equipment. The upper housing (2) has a hexagonal groove inside. The upper stationary cutter head (7) is hexagonal in shape and fixedly installed in the hexagonal groove of the upper housing (2). Five straight sliding grooves are evenly distributed on the upper surface of the upper stationary cutter head (7). The upper moving cutter head (4) has a large bevel gear structure on the outside. The upper bevel gear (3) meshes with the upper moving cutter disc (4) to complete the transmission. Five arc-shaped sliding grooves are evenly distributed inside the upper moving cutter disc (4). The shearing gate (6) is provided with sliding keys on the upper and lower sides. The upper and lower sliding keys of the shearing gate (6) mesh with the arc-shaped sliding groove of the upper moving cutter disc (4) and the straight sliding groove of the upper stationary cutter disc (7) respectively. The upper cap (5) and the sliding key on the shearing gate (6) are connected by threads to achieve positioning. The shearing gate (6) is arranged between the upper moving cutter disc (4) and the upper stationary cutter disc (7). When the upper moving cutter disc (4) rotates, it drives the shearing gate (6) to slide between the discs to achieve the opening and closing motion of the staggered shearing. The rotary clamping seal assembly is located at the bottom and includes a lower bevel gear (8), a lower moving cutterhead (9), a lower end cap (10), a clamping gate (11), a lower stationary cutterhead (12), a sensor (13), and a lower flange (14). The lower flange (14) is located at the bottom of the blowout preventer to connect to the lower wellhead. The lower flange (14) has a hexagonal groove inside. The sensor (13) is embedded in the side wall of the central through hole inside the lower flange (14). In terms of spatial relative position, it is located directly below the lower stationary cutterhead (12) and is used to monitor the fluid state flowing through the wellhead in real time. The lower stationary cutterhead (12) has a hexagonal outline and is fixedly installed in the hexagonal groove of the lower flange (14). The upper surface is evenly distributed with five straight sliding grooves. The lower moving cutter disc (9) is provided with a large bevel gear structure on the outside, which meshes with the lower bevel gear (8) to complete the transmission. The lower moving cutter disc (9) is evenly distributed with five arc-shaped sliding grooves inside. The clamping gate (11) is provided with sliding keys on the upper and lower sides. The upper and lower sliding keys of the clamping gate (11) mesh with the arc-shaped sliding groove of the lower moving cutter disc (9) and the straight sliding groove of the lower stationary cutter disc (12) respectively. The lower end cap (10) and the sliding key on the clamping gate (11) are connected by threads to achieve positioning. The clamping gate (11) is arranged between the lower moving cutter disc (9) and the lower stationary cutter disc (12). When the lower moving cutter disc (9) rotates, it drives the clamping gate (11) to slide towards the middle to achieve the opening and closing movement of clamping seal. The electronically controlled drive assembly includes an upper motor (15), a lower motor (16), a control unit (17), a motor housing (18), and a ground power supply (19). The motor housing (18) is fixedly installed on one side of the blowout preventer housing. The upper motor (15) and the lower motor (16) are both installed inside the motor housing (18). The output shaft of the upper motor (15) is connected to the upper bevel gear (3) by a key to drive the rotary shear sealing assembly and is equipped with a mechanical dynamic seal. The output shaft of the lower motor (16) is connected to the lower bevel gear (8) by a key to drive the rotary clamping sealing assembly and is equipped with a mechanical dynamic seal. The control unit (17) is connected to the upper motor (15), the lower motor (16), and the sensor (13) by wire. The control unit (17) is used to receive the wellhead status data transmitted back by the sensor (13) in real time, make intelligent judgments, and send instructions to precisely control the rotation and torque output of the two motors. The ground power supply (19) is connected to the control unit (17) to provide power to the entire system.

2. The fully electronically controlled two-stage staggered shear blowout preventer according to claim 1, characterized in that: The fully electrically controlled dual-stage staggered shear blowout preventer has a clamping and sealing mode and a shearing and sealing mode. In the clamping and sealing mode, the control unit (17) sends a command to drive the lower motor (16) to work based on the monitoring signal of the sensor (13). The torque is transmitted through the meshing of the lower bevel gear (8) and the lower moving cutter head (9) to achieve clamping and sealing. In the shearing and sealing mode, the control unit (17) sends a command to control the lower motor (16) and the upper motor (15) to work based on the monitoring signal of the sensor (13). While the lower motor (16) drives the clamping gate (11) to clamp the drill bit, the upper motor (15) outputs high torque. The strong shearing and sealing are completed through the meshing of the upper bevel gear (3) and the upper moving cutter head (4).

3. The fully electronically controlled two-stage staggered shear blowout preventer according to claim 1, characterized in that: The sliding motion of the shearing gate (6) is achieved by the arc-shaped groove of the upper moving cutter head (4) and the straight groove of the upper stationary cutter head (7) together limiting and guiding. When the upper moving cutter head (4) rotates, the arc-shaped groove inside it rotates accordingly. Through the sliding key acting on the shearing gate (6), the shearing gate (6) is forced to make radial linear reciprocating motion along the straight groove fixed by the upper stationary cutter head (7), thereby completing the convergence and shearing or outward opening of the misaligned shearing gate.

4. The fully electronically controlled two-stage staggered shear blowout preventer according to claim 1, characterized in that: The sliding motion of the clamping gate (11) is achieved by the arc-shaped groove of the lower moving cutter head (9) and the straight groove of the lower stationary cutter head (12) together limiting and guiding. When the lower moving cutter head (9) rotates, the arc-shaped groove inside it forces the clamping gate (11) to make radial linear reciprocating motion along the straight groove fixed by the lower stationary cutter head (12) by the sliding key acting on the clamping gate (11), thereby realizing that multiple clamping gates (11) converge towards the center to clamp the drill bit or retract and open outward.

5. The fully electronically controlled two-stage staggered shear blowout preventer according to claim 1, characterized in that: The mechanical dynamic seals installed at the output shafts of the upper motor (15) and the lower motor (16) are used to effectively isolate the fluid inside the wellbore from the internal environment of the motor box (18) and ensure the safety of electrical components under the impact of high-pressure fluids such as blowouts; the wired connection between the control unit (17) and the upper motor (15), the lower motor (16) and the sensor (13) is used to ensure the stability and anti-interference ability of sensor status data feedback, control signal transmission and motor power transmission under the extreme and harsh working conditions of high interference and high vibration downhole.

6. The fully electronically controlled two-stage staggered shear blowout preventer according to claim 1, characterized in that: The tip of the shear gate (6) is made of high-strength metal to improve strength and facilitate cutting of drilling tools inside the well.

Images