Shearing device with drill rod restraining function and shearing ram assembly

Abstract

The utility model discloses a shearing device with a drill rod restraining function and a shearing ram assembly, the shearing device is used for shearing a drill rod, and the shearing device comprises a power unit and a cutting assembly; the power unit has an extension state and a contraction state, and the power unit can be switched between the extension state and the contraction state; the cutting assembly comprises a first cutter body and a second cutter body, the first cutter body and the second cutter body are arranged on the two opposite sides of the drill rod, the ends, away from the drill rod, of the first cutter body and the second cutter body are connected with power units correspondingly, and the two oppositely-arranged power units act synchronously to drive the first cutter body and the second cutter body to move in the opposite direction or in the opposite direction. In the process that the power unit is switched from the contraction state to the stretching state, the first cutter body and the second cutter body gradually get close to the drill rod, and when the first cutter body and the second cutter body oppositely move to the preset position, an operation space used for containing the drill rod is formed between the first cutter body and the second cutter body.

Description

Technical Field

[0001] This application relates to the field of oil drilling and production testing well control equipment technology, and more specifically, to a shearing device and shearing gate assembly with drill pipe restraint function. Background Technology

[0002] In oil and gas drilling operations, in order to safely drill through high-pressure oil and gas layers and avoid wellbore blowout accidents that could disrupt normal drilling operations, damage oil and gas resources, and ensure the safety of drilling personnel and oil and gas wells, a blowout preventer needs to be installed at the wellhead.

[0003] Blowout preventers (BOPs) are the most critical equipment in well control systems for controlling wellhead pressure and preventing blowouts. The shear gate is a key component of the BOP, primarily used to effectively cut the drill pipe in the event of a blowout during drilling, well workover, or well testing, thereby achieving an effective seal to prevent blowout accidents and ensure the safety of personnel and equipment.

[0004] The shear gate is the core component that enables the blowout preventer (BOP) to shear the drill pipe. When a conventional shear gate shears the drill pipe, the shearing reaction force from the drill pipe causes the drill pipe to deviate or detach from the shear gate's blades during the shearing process, resulting in the inability to shear the drill pipe. This prevents the BOP from effectively closing, threatening well control safety. Utility Model Content

[0005] One objective of this application is to provide a new technical solution for a shearing device with a drill pipe restraint function.

[0006] According to a first aspect of this application, a shearing device with a drill pipe restraining function is provided. This shearing device with drill pipe restraining function is used for shearing drill pipes. The shearing device includes a power unit and a cutting assembly. The power unit has an extended state and a retracted state, and the power unit can switch between the extended state and the retracted state. The cutting assembly includes a first cutter body and a second cutter body, which are disposed on opposite sides of the drill pipe, and the power unit is connected to the end of the cutter body facing away from the drill pipe. The two opposing power units synchronously drive the first cutter body and the second cutter body to move towards each other or away from each other. During the process of the power unit switching from the retracted state to the extended state, the first cutter body and the second cutter body gradually approach the drill pipe. When the second cutter body moves towards the preset position, a working space for accommodating the drill rod is formed between the first cutter body and the second cutter body; wherein, the cutting edge side of the first cutter body and the cutting edge side of the second cutter body both have a limiting part, and a shearing part is provided in the middle of the limiting part along the horizontal direction. The distance between the two shearing parts is greater than the distance between the ends of the two limiting parts away from the shearing parts. In a plane parallel to the axial direction of the drill rod, the first cutter body and the second cutter body are staggered. When the first cutter body and the second cutter body move to the preset position, one side of the first cutter body is in contact with one side of the second cutter body. In a plane perpendicular to the axial direction of the drill rod, the shearing part of the first cutter body is parallel to the shearing part of the second cutter body.

[0007] Optionally, the limiting part has a first end and a second end that are disposed opposite to each other in the horizontal direction. The first end is connected to the shearing part, and the distance between the limiting part of the first blade and the limiting part of the second blade that are disposed opposite to each other gradually decreases from the first end to the second end.

[0008] Optionally, the cutting assembly further includes a first shear gate and a second shear gate disposed opposite to each other. The first cutter body is detachably connected to the first shear gate, and the second cutter body is detachably connected to the second shear gate. The first shear gate and the second shear gate are connected to two power units disposed opposite to each other. The two power units respectively drive the first shear gate and the second shear gate to move towards each other or away from each other along the radial direction of the drill rod.

[0009] Optionally, the first shear gate is provided with support grooves at both ends along the horizontal direction, and the second shear gate is provided with fitting parts adapted to the support grooves on opposite sides along the horizontal direction. During the process of the power unit switching from the retracted state to the extended state, the first shear gate and the second shear gate gradually approach the drill rod. When the first shear gate and the second shear gate move towards each other to a preset position, the fitting parts are fitted into the support grooves, and the first shear gate and the second shear gate form a limiting fit in the axial direction of the drill rod.

[0010] Optionally, the first cutter body and the support groove are arranged from top to bottom along the axial direction of the drill rod, and the mounting portion is disposed on opposite sides of the second cutter body in the horizontal direction.

[0011] Optionally, both the support groove and the mounting portion are provided with a sealing element, and the sealing element is detachably connected to the support groove and the mounting portion.

[0012] Optionally, both the first shear gate and the second shear gate are provided with guide grooves, and the telescopic end of the power unit is embedded in the guide groove and forms a limiting fit with the guide groove along the axial direction of the drill rod.

[0013] Optionally, the power unit includes a gate shaft and a drive component, with the opposite ends of the gate shaft connected to the drive component and the cutting assembly, respectively.

[0014] According to a second aspect of this application, a shear gate assembly is provided, the shear gate assembly including a housing and a shearing device having a drill rod restraining function as described above, the housing having a receiving cavity, and the shearing device having the drill rod restraining function being located within the receiving cavity.

[0015] Optionally, the housing has a drill hole communicating with the receiving cavity, the drill rod passes through the drill hole and is located between the first cutter body and the second cutter body.

[0016] In this embodiment, the power unit can switch between an extension / retraction state and a retraction state. Two power units, arranged opposite each other, move synchronously to drive the first and second cutter bodies to move towards or away from each other. During the transition from the retraction state to the extension / retraction state, the first and second cutter bodies move towards each other, gradually approaching the drill rod, and the distance between them gradually decreases. When the first and second cutter bodies reach a preset position, the limiting part and shearing part of the first and second cutter bodies enclose a working space, defining the relative position of the drill rod and the first and second cutter bodies to facilitate drilling operations. In a plane perpendicular to the drill rod's axial direction, the shearing part of the first cutter body is parallel to the shearing part of the second cutter body. By arranging the two shearing parts parallel, the first and second cutter bodies gradually press the drill rod together horizontally. During the process, the drill rod can fully contact the shearing part within the working space to facilitate effective shearing of the drill rod. When the first and second cutter bodies move towards each other to a preset position, the opposite ends of the first cutter body along the horizontal direction contact the opposite ends of the second cutter body along the horizontal direction. In this state, the drill rod is located within the working space. The working space is closed by the contact between the end of the first cutter body limiting part away from the shearing part and the end of the second cutter body limiting part away from the shearing part, preventing the drill rod from leaving the working space during the shearing process. The power unit continues to drive the first and second cutter bodies to move towards each other, so that the first and second cutter bodies gradually press the drill rod together in the horizontal direction, so that the drill rod is located between the shearing part of the first cutter body and the shearing part of the second cutter body. The two parallel shearing parts can better restrain the drill rod, so that the drill rod does not deviate during the shearing process, thus facilitating smooth shearing.

[0017] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present application and, together with their description, serve to explain the principles of the present application.

[0019] Figure 1 This is a schematic diagram of the shearing device in the embodiments of this application;

[0020] Figure 2 This is a schematic diagram of the shearing unit in the embodiments of this application;

[0021] Figure 3 This is a top view of the cutting assembly and drill rod in the embodiments of this application;

[0022] Figure 4 This is a schematic diagram of the shear gate assembly in the embodiments of this application;

[0023] Figure 5 yes Figure 4 Exploded view.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1-Power unit; 11-Guard shaft; 12-Drive component;

[0026] 2-Cutting assembly; 21-First blade body; 22-Second blade body; 23-Working space; 24-Limiting part; 241-First end; 242-Second end; 25-Shearing part; 26-First shearing gate; 261-Support groove; 27-First shearing gate; 271-Embedding part; 28-Seal; 29-Guide groove;

[0027] 3-Shell; 31-Receiving cavity; 32-Drill hole;

[0028] 4-Drill pipe. Detailed Implementation

[0029] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0030] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0031] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0032] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0034] According to one embodiment of this application, a shearing device with a drill pipe restraining function is provided. This shearing device is used to shear a drill pipe 4, and includes a power unit 1 and a cutting assembly 2. The power unit 1 has an extended state and a retracted state, and can switch between the extended and retracted states. The cutting assembly 2 includes a first cutter body 21 and a second cutter body 22, which are disposed on opposite sides of the drill pipe 4, and the ends facing away from the drill pipe 4 are respectively connected to the power unit 1. The two opposing power units 1 synchronously drive the first cutter body 21 and the second cutter body 22 to move towards each other or away from each other. During the process of the power unit 1 switching from the retracted state to the extended state, the first cutter body 21... As the first cutter body 21 and the second cutter body 22 gradually approach the drill rod 4, when they move toward a preset position, a working space 23 for accommodating the drill rod 4 is formed between them. Both the cutting edge of the first cutter body 21 and the cutting edge of the second cutter body 22 have a limiting portion 24. A shearing portion 25 is provided at the middle of the limiting portion 24 in the horizontal direction. The distance between the two shearing portions 25 is greater than the distance between the ends of the two limiting portions 24 that are away from the shearing portions 25. In a plane perpendicular to the axial direction of the drill rod 4, the shearing portion 25 of the first cutter body 21 is parallel to the shearing portion 25 of the second cutter body 22.

[0035] like Figures 1 to 3 As shown, the shearing device is used to shear drill rod 4 and achieve effective sealing.

[0036] Power unit 1 can be a hydraulic pump or similar device. During the process of power unit 1 switching from the extended state to the retracted state, the cutting component 2 connected to the telescopic end of power unit 1 gradually moves away from the drill rod 4. When power unit 1 switches from the retracted state to the extended state, the cutting component 2 gradually approaches the drill rod 4, and when it moves to the preset position, it begins to cut the drill rod 4 until the drill rod 4 is cut off.

[0037] The shearing device includes a first cutter body 21 and a second cutter body 22. The drill rod 4 is located between the first cutter body 21 and the second cutter body 22. During the process of switching from a retracted state to an extended state by two opposing power units 1, the first cutter body 21 and the second cutter body 22 are driven to move towards each other, so that the distance between the first cutter body 21 and the second cutter body 22 gradually decreases. When the opposite ends of the first cutter body 21 and the second cutter body 22 in the horizontal direction come into contact, a working space 23 is formed between the first cutter body 21 and the second cutter body 22, confining the drill rod 4 located between the first cutter body 21 and the second cutter body 22 within the working space 23. The two power units 1 continue to drive the first cutter body 21 and the second cutter body 22 to move towards each other, so that the first cutter body 21 and the second cutter body 22 gradually approach the drill rod 4 until they clamp and shear the drill rod 4, thereby achieving the cutting and sealing of the drill rod 4.

[0038] When the two opposing power units 1 switch from the extended state to the retracted state, the first cutter body 21 and the second cutter body 22 move in opposite directions. During this process, the distance between the first cutter body 21 and the second cutter body 22 gradually increases. By moving the first cutter body 21 and the second cutter body 22 in opposite directions, it is easier to accommodate drill rods 4 of different diameters. Moreover, by moving the first cutter body 21 and the second cutter body 22 in opposite directions, it prepares for the next shearing of the drill rod 4, reduces the waiting time before shearing, and improves the shearing efficiency.

[0039] like Figures 1 to 3 As shown, the cutting edges of the first cutter body 21 and the second cutter body 22 have the same shape, that is, the cutting edge shape is the same. The cutting edge is arc-shaped, and a horizontal segment is formed in the middle of the horizontal direction of the arc-shaped cutting edge. This horizontal segment is the shearing part 25. The two opposite ends of the shearing part 25 in the horizontal direction are limiting parts 24. By setting the limiting parts 24 at the opposite ends of the shearing part 25, the limiting parts 24 of the first cutter body 21, the shearing part 25, and the limiting parts 24 and shearing part 25 of the second cutter body 22 enclose and form a working space 23, which confines the drill rod 4 within the working space 23 and prevents the drill rod 4 from sliding out of the working space 23 in the horizontal direction and detaching from the shearing part 25.

[0040] Of course, the limiting part 24 in this embodiment is not limited to the structure described above, and those skilled in the art can configure it according to actual needs. For example, the limiting part 24 can be an arc-shaped cutting edge or an inclined straight-edged cutting edge.

[0041] The first cutter body 21 and the second cutter body 22 are arranged alternately, that is, when the first cutter body 21 and the second cutter body 22 move towards each other through the power unit 1 until the two ends of the first cutter body 21 in the horizontal direction contact the two ends of the second cutter body 22 in the horizontal direction, the lower surface of the first cutter body 21 is in contact with the upper surface of the second cutter body 22, or the upper surface of the first cutter body 21 is in contact with the lower surface of the second cutter body 22. As the shearing portion 25 of the first cutter body 21 and the shearing portion 25 of the second cutter body 22 continue to move towards each other, the distance between the shearing portions 25 of the first cutter body 21 and the shearing portions 25 of the second cutter body 22 continues to decrease, thereby shearing the drill rod 4.

[0042] In this embodiment, the power unit 1 can switch between an extended state and a retracted state. Two power units 1 positioned opposite each other move synchronously to drive the first cutter body 21 and the second cutter body 22 to move towards or away from each other. During the process of the power unit 1 switching from the retracted state to the extended state, the first cutter body 21 and the second cutter body 22 move towards each other and gradually approach the drill rod 4, and the distance between the first cutter body 21 and the second cutter body 22 gradually decreases. When the first cutter body 21 and the second cutter body 22 move to a preset position... The limiting part 24 and shearing part 25 of the first cutter body 21 and the limiting part 24 and shearing part 25 of the second cutter body 22 enclose a working space 23 to limit the relative position of the drill rod 4 with the first cutter body 21 and the second cutter body 22, so as to facilitate the operation of the drill rod 4. In a plane perpendicular to the axial direction of the drill rod 4, the shearing part 25 of the first cutter body 21 and the shearing part 25 of the second cutter body 22 are parallel. By arranging the two shearing parts 25 in parallel, the first cutter body 21 and the second cutter body 22 gradually press the drill rod 4 together in the horizontal direction. During the process, the drill rod 4 can fully contact the shearing part 25 within the working space 23, so as to effectively shear the drill rod 4; when the first cutter body 21 and the second cutter body 22 move towards each other to the preset position, the opposite ends of the first cutter body 21 in the horizontal direction contact the opposite ends of the second cutter body 22 in the horizontal direction. In this state, the drill rod 4 is located within the working space 23, and the end of the limiting part 24 of the first cutter body 21 that is away from the shearing part 25 contacts the end of the limiting part 24 of the second cutter body 22 that is away from the shearing part 25. The end contacts close the working space 23 to prevent the drill rod 4 from leaving the working space 23 during the shearing process. The power unit 1 continues to drive the first cutter body 21 and the second cutter body 22 to move towards each other, so that the first cutter body 21 and the second cutter body 22 gradually press the drill rod 4 together in the horizontal direction, so that the drill rod 4 is located between the shearing part 25 of the first cutter body 21 and the shearing part 25 of the second cutter body 22. The two parallel shearing parts 25 can better restrain the drill rod 4, so that the drill rod 4 does not deviate during the shearing process, so as to facilitate smooth shearing.

[0043] In one example, the limiting portion 24 has a first end 241 and a second end 242 disposed opposite to each other in the horizontal direction. The first end 241 is connected to the shearing portion 25. The distance between the limiting portion 24 of the first blade body 21 and the limiting portion 24 of the second blade body 22 disposed opposite to each other gradually decreases from the first end 241 to the second end 242.

[0044] like Figures 1 to 3 As shown, the limiting part 24 is an inclined straight-edged blade. The limiting part 24 has a first end 241 and a second end 242 that are arranged opposite each other in the horizontal direction. The first end 241 is connected to one end of the shearing part 25.

[0045] The distance between the first cutter body 21 and the second cutter body 22 gradually decreases from the first end 241 to the second end 242. That is, the distance between the first end 241 of the limiting portion 24 of the first cutter body 21 and the first end 241 of the limiting portion 24 of the second cutter body 22 is greater than the distance between the second ends 242 of the limiting portion 24 of the first cutter body 21 and the second cutter body 22. By making the distance between the second ends 242 of the two opposing limiting portions 24 smaller than the distance between the first ends 241 of the two limiting portions 24, when the first cutter body 21 and the second cutter body 22 move towards each other to a preset position, the horizontal ends of the first cutter body 21 and the second cutter body 22 contact first, allowing the working space 23 to close. This confines the drill rod 4 within the working space 23, preventing the drill rod 4 from detaching from the working space 23 during the relative movement of the first cutter body 21 and the second cutter body 22, thus affecting the shearing effect.

[0046] Of course, the limiting part 24 in this embodiment is not limited to the structure described above, and those skilled in the art can configure it according to actual needs. For example, the limiting part 24 can also be an arc-shaped blade.

[0047] In one example, the cutting assembly 2 further includes a first shearing gate 26 and a second shearing gate 27 disposed opposite to each other. The first cutter body 21 is detachably connected to the first shearing gate 26, and the second cutter body 22 is detachably connected to the second shearing gate 27. The first shearing gate 26 and the second shearing gate 27 are connected to two power units 1 disposed opposite to each other. The two power units 1 respectively drive the first shearing gate 26 and the second shearing gate 27 to move towards each other or away from each other in the radial direction of the drill rod 4.

[0048] like Figures 1 to 3As shown, the drill rod 4 is located between the first shear gate 26 and the second shear gate 27. The first cutter body 21 is disposed on the first shear gate 26, and the second cutter body 22 is disposed on the second shear gate 27. The first shear gate 26 and the second shear gate 27 are driven to move towards each other by two power units 1 arranged opposite to each other, thereby driving the first cutter body 21 and the second cutter body 22 to move towards each other to shear the drill rod 4.

[0049] The first shearing gate 26 is detachably connected to the first blade 21, and the second shearing gate 27 is detachably connected to the second blade 22. This detachable connection facilitates blade replacement, effectively reducing equipment maintenance and repair costs and operational complexity.

[0050] In one example, the first shear gate 26 has support grooves 261 at both ends along the horizontal direction, and the second shear gate 27 has fitting portions 271 that are adapted to the support grooves 261 on opposite sides along the horizontal direction. During the process of the power unit 1 switching from the retracted state to the extended state, the first shear gate 26 and the second shear gate 27 gradually approach the drill rod 4. When the first shear gate 26 and the second shear gate 27 move towards each other to a preset position, the fitting portions 271 are fitted into the support grooves 261, and the first shear gate 26 and the second shear gate 27 form a limiting fit in the axial direction of the drill rod 4.

[0051] like Figures 1 to 3 As shown, the first shear gate 26 has a support groove 261, and the second shear gate 27 has an insert portion 271. The support groove 261 of the first shear gate 26 and the insert portion 271 of the second shear gate 27 are arranged opposite to each other. By synchronously switching from a retracted state to an extended state by the two power units 1, the first shear gate 26 and the second shear gate 27 are driven to move towards each other, so that the insert portion 271 gradually embeds into the support groove 261. During this process, the first cutter body 21 and the second cutter body 22 gradually approach the drill pipe 4, so that the dimension of the working space 23 along the radial direction of the drill pipe 4 gradually decreases.

[0052] The mounting portion 271 of the second shear gate 27 is embedded in the support groove 261 of the first shear gate 26. The first shear gate 26 and the second shear gate 27 support each other to form an integral unit, thereby reducing the vertical offset of the first shear gate 26 and the second shear gate 27 and effectively improving the sealing effect of the shearing device.

[0053] In one example, the first cutter body 21 and the support groove 261 are arranged from top to bottom along the axial direction of the drill rod 4, and the mounting portion 271 is disposed on opposite sides of the second cutter body 22 in the horizontal direction.

[0054] like Figures 1 to 3 As shown, when the first shearing gate 26 and the second shearing gate 27 move toward each other and shear the drill rod 4, the first cutter body 21 is located above the second cutter body 22. In this state, the mounting portion 271 of the second shearing gate 27 is embedded in the support groove 261 of the first shearing gate 26.

[0055] The support groove 261 is a through groove provided on the first shear gate 26, and the through groove is located below the first blade body 21. The groove extends from the first shear gate 26 to the second shear gate 27, and an opening is provided on the side of the through groove near the second shear gate 27, through which the mounting part 271 of the second shear gate 27 is inserted into the through groove.

[0056] The mounting portion 271 is a protrusion located at opposite ends of the second cutter body 22 along the horizontal direction. The protrusion is adapted to the support groove 261 of the first shear gate 26. By mounting the mounting portion 271 in the support groove 261, the first shear gate 26 and the second shear gate 27 are fitted together to form an integral unit, which effectively improves the connection strength of the first shear gate 26 and the second shear gate 27 in the axial direction of the drill rod 4 and prevents the first shear gate 26 and the second shear gate 27 from shifting vertically, causing the sealing of the shearing device to fail.

[0057] Of course, the mounting portion 271 in this embodiment is not limited to the above structure, and those skilled in the art can make it according to actual needs. For example, the mounting portion 271 and the second blade 22 are an integral structure, that is, the dimension of the second blade 22 in the horizontal direction is larger than the dimension of the first blade 21 in the horizontal direction, and the opposite ends of the second blade 22 in the horizontal direction can be embedded in the support groove 261.

[0058] In one example, both the support groove 261 and the mounting portion 271 are provided with a seal 28, which is detachably connected to the support groove 261 and the mounting portion 271.

[0059] like Figures 1 to 3 As shown, the sealing element 28 is provided on the outside of the insert portion 271 and the outside of the support groove 261. The sealing effect of the shearing device is enhanced by providing the sealing element 28.

[0060] For example, the support groove 261 of the first shear gate 26 is a long strip through groove structure, the shape of the seal 28 of the support groove 261 is adapted to the shape of the through groove, the seal 28 of the support groove 261 is long strip, and a plug is provided at one end of the seal 28.

[0061] Sealing grooves are provided on both opposite sides of the first shear gate 26. The sealing grooves are located outside the support groove 261, and insertion holes adapted to the insertion rod are provided on the side walls of the sealing grooves. When assembling the sealing element 28 with the first shear gate 26, the sealing element 28 is inserted into the sealing groove from the second shear gate 27 toward the first shear gate 26, and the insertion rod is gradually embedded into the insertion hole. The connection between the insertion rod and the insertion hole not only enhances the sealing effect of the sealing element 28, but also effectively improves the connection strength between the sealing element 28 and the sealing groove.

[0062] In one example, both the first shear gate 26 and the second shear gate 27 are provided with guide grooves 29. The telescopic end of the power unit 1 is embedded in the guide groove 29 and forms a limiting fit with the guide groove 29 along the axial direction of the drill rod 4.

[0063] like Figures 1 to 3 As shown, a horizontal guide groove 29 is provided on the side of the first shear gate 26 away from the first cutter body 21, and a horizontal guide groove 29 is provided on the side of the second shear gate 27 away from the second cutter body 22.

[0064] For example, such as Figures 1 to 3 As shown, the horizontal guide groove 29 is a long, narrow through-slot structure. This through-slot extends horizontally from the middle of the first shear gate 26 to its edge. The end of the gate shaft 11 is embedded in the horizontal guide groove 29 and connected to the middle of the end face of the first shear gate 26. The horizontal guide groove 29 connects to the gate shaft 11, thus limiting the position of the cutting assembly 2 in the axial direction of the drill rod 4, effectively reducing the downward force exerted by the drill rod 4 on the cutting assembly 2.

[0065] A horizontal guide groove 29 is provided on the side of the second shear gate 27 away from the first shear gate 26. The guide groove 29 extends in the opposite direction to the guide groove 29 of the first shear gate 26.

[0066] The second shear gate 27 has the same structure as the first shear gate 26, and the second shear gate 27 is arranged opposite to the first shear gate 26.

[0067] In one example, the power unit 1 includes a gate shaft 11 and a drive member 12, with the opposite ends of the gate shaft 11 connected to the drive member 12 and the cutting assembly 2, respectively.

[0068] like Figures 1 to 3As shown, the drive unit 12 can be a hydraulic pump or similar device. The drive unit 12 is connected to the cutting assembly 2 via a gate shaft 11. Gate shafts 11 are connected to opposite sides of the cutting assembly 2, with the side of the gate shaft 11 facing away from the cutting assembly 2 connected to the drive unit 12. The drive unit 12 drives the gate shafts 11 to move, thereby driving the first shearing gate 26 and the second shearing gate 27 to move towards or away from each other, so that the oppositely arranged first cutter body 21 and second cutter body 22 can gradually approach and shear the drill rod 4.

[0069] According to another embodiment of this application, a shear gate assembly is provided, which includes a housing 3 and a shearing device with a drill rod restraining function as described above. The housing 3 has a receiving cavity 31, and the shearing device with the drill rod restraining function is located in the receiving cavity 31.

[0070] like Figures 1 to 5 As shown, the housing 3 is rectangular in shape. A receiving cavity 31 is provided inside the housing 3. The receiving cavity 31 is used to house the cutting assembly 2. The telescopic end of the power unit 1 extends into the receiving cavity 31 and connects to the shearing device. The drill rod 4 passes through the receiving cavity 31 and is located between the first cutter body 21 and the second cutter body 22. The power unit 1 drives the first cutter body 21 and the second cutter body 22 to move towards each other to shear the drill rod 4.

[0071] By placing the cutting assembly 2 inside the housing 3, not only can the axial bearing force of the first cutter body 21 and the second cutter body 22 be strengthened, and the downward force exerted by the drill rod 4 on the cutting assembly 2 be reduced, but also the connection strength of the first shearing gate 26 and the second shearing gate 27 in the axial direction can be improved through the cooperation of the power unit 1 and the housing 3. This reduces the vertical displacement of the first shearing gate 26 and the second shearing gate 27 during the shearing of the drill rod 4, and makes the cutter bodies on the first shearing gate 26 and the second shearing gate 27 move closer to each other to shear the drill rod 4, thus achieving effective sealing.

[0072] In one example, the housing 3 has a drill hole 32 communicating with the receiving cavity 31, the drill rod 4 passes through the drill hole 32 and is located between the first cutter body 21 and the second cutter body 22.

[0073] like Figures 1 to 5 As shown, the drill hole 32 is used to accommodate the drill rod 4. The drill hole 32 is formed on the housing 3, penetrates the housing 3 along the axial direction of the drill rod 4, and communicates with the receiving cavity 31. By forming the drill hole 32, so that the drill rod 4 can pass through the shear gate assembly, not only can the relative positional accuracy of the drill rod 4 and the cutting component 2 be improved, but the sway amplitude of the drill rod 4 can also be reduced, effectively limiting the position of the drill rod 4 within the working space 23 and improving the shearing efficiency.

[0074] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. A shearing device with a drill pipe restraining function, used for shearing drill pipe (4), characterized in that, include: A power unit (1) having an extended state and a retracted state, and the power unit (1) being able to switch between the extended state and the retracted state; The cutting assembly (2) includes a first cutter body (21) and a second cutter body (22). The first cutter body (21) and the second cutter body (22) are disposed on two opposite sides of the drill rod (4), and the power unit (1) is connected to the end opposite to the drill rod (4). The two power units (1) disposed opposite to each other drive the first cutter body (21) and the second cutter body (22) to move towards each other or away from each other. During the process of the power unit (1) switching from the retracted state to the extended state, the first cutter body (21) and the second cutter body (22) gradually approach the drill rod (4). When the first cutter body (21) and the second cutter body (22) move towards each other to a preset position, a working space (23) for accommodating the drill rod (4) is formed between the first cutter body (21) and the second cutter body (22). The first blade (21) and the second blade (22) each have a limiting part (24) on their cutting edge sides. A shearing part (25) is provided at the middle of the limiting part (24) in the horizontal direction. The distance between the two shearing parts (25) is greater than the distance between the ends of the two limiting parts (24) that are away from the shearing parts (25). In a plane parallel to the axial direction of the drill rod (4), the first cutter body (21) and the second cutter body (22) are staggered. When the first cutter body (21) and the second cutter body (22) move to a preset position, one side of the first cutter body (21) is in contact with one side of the second cutter body (22). In a plane perpendicular to the axial direction of the drill rod (4), the shearing part (25) of the first cutter body (21) is parallel to the shearing part (25) of the second cutter body (22).

2. The shearing device with drill pipe restraint function according to claim 1, characterized in that, The limiting part (24) has a first end (241) and a second end (242) arranged opposite to each other in the horizontal direction. The first end (241) is connected to the shearing part (25). The distance between the limiting part (24) of the first blade body (21) and the limiting part (24) of the second blade body (22) arranged opposite to each other gradually decreases from the first end (241) to the second end (242).

3. The shearing device with drill pipe restraint function according to claim 1, characterized in that, The cutting assembly (2) further includes a first shear gate (26) and a second shear gate (27) arranged opposite to each other. The first cutter body (21) is detachably connected to the first shear gate (26), and the second cutter body (22) is detachably connected to the second shear gate (27). The first shear gate (26) and the second shear gate (27) are connected to two power units (1) arranged opposite to each other. The two power units (1) respectively drive the first shear gate (26) and the second shear gate (27) to move towards each other or away from each other along the radial direction of the drill rod (4).

4. The shearing device with drill pipe restraint function according to claim 3, characterized in that, The first shear gate (26) has support grooves (261) at both ends along the horizontal direction. The second shear gate (27) has fitting parts (271) adapted to the support grooves (261) on opposite sides along the horizontal direction. During the process of the power unit (1) switching from the retracted state to the extended state, the first shear gate (26) and the second shear gate (27) gradually approach the drill rod (4). When the first shear gate (26) and the second shear gate (27) move towards each other to a preset position, the fitting parts (271) are embedded in the support grooves (261). The first shear gate (26) and the second shear gate (27) form a limiting fit in the axial direction of the drill rod (4).

5. The shearing device with drill pipe restraint function according to claim 4, characterized in that, The first cutter body (21) and the support groove (261) are arranged from top to bottom along the axial direction of the drill rod (4), and the mounting part (271) is disposed on opposite sides of the second cutter body (22) in the horizontal direction.

6. The shearing device with drill pipe restraint function according to claim 4, characterized in that, Both the support groove (261) and the mounting part (271) are provided with a sealing element (28), and the sealing element (28) is detachably connected to the support groove (261) and the mounting part (271).

7. The shearing device with drill pipe restraint function according to claim 3, characterized in that, The first shear gate (26) and the second shear gate (27) are both provided with guide grooves (29). The telescopic end of the power unit (1) is embedded in the guide groove (29) and forms a limiting fit with the guide groove (29) along the axial direction of the drill rod (4).

8. The shearing device with drill pipe restraint function according to claim 1, characterized in that, The power unit (1) includes a gate shaft (11) and a drive member (12), with the two ends of the gate shaft (11) connected to the drive member (12) and the cutting assembly (2) respectively.

9. A shear gate assembly, characterized in that, The device includes a housing (3) and a shearing device with a drill pipe restraining function as described in any one of claims 1-8, wherein the housing (3) has a receiving cavity (31) and the shearing device with the drill pipe restraining function is located in the receiving cavity (31).

10. The shear gate assembly according to claim 9, characterized in that, The housing (3) has a drill hole (32) communicating with the receiving cavity (31), and the drill rod (4) passes through the drill hole (32) and is located between the first cutter body (21) and the second cutter body (22).

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