Self-balancing shear ram assembly and blowout prevention system

Abstract

The utility model discloses a self-balancing type shear ram assembly and a blowout prevention system, the self-balancing type shear ram assembly is used for shearing a drill rod, and the self-balancing type shear ram assembly comprises a driving device, a shearing device and a blade; the shearing device comprises a first flashboard body and a second flashboard body which are oppositely arranged, the first flashboard body and the second flashboard body are connected with two driving devices which are oppositely arranged, and the two driving devices drive the first flashboard body and the second flashboard body to move in the opposite directions or move in the opposite directions in the radial direction of the drill rod. The distance between the middle portions of the two oppositely-arranged blades in the horizontal direction is larger than the distance between the ends of the two blades. The first flashboard body is provided with an inserting groove, the blade of the second flashboard body is provided with an inserting part matched with the inserting groove, when the first flashboard body and the second flashboard body oppositely move to a preset position, the inserting part is embedded in the inserting groove, and the first flashboard body and the second flashboard body are in limiting fit in the axial direction of the drill rod; and a shearing space for accommodating a drill rod is formed between the two oppositely arranged blades.

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 self-balancing shear gate assembly and blowout preventer system. Background Technology

[0002] In oil and gas drilling operations, in order to safely drill through high-pressure oil and gas layers and avoid well 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 shear 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 assembly is a core component that enables the blowout preventer (BOP) to shear the drill pipe and achieve effective sealing. When a conventional shear gate shears the drill pipe, the shearing reaction force causes relative displacement between the upper and lower shear gate blades, leading to shear gate blade seal failure. This prevents safe wellhead closure and threatens well control safety. Utility Model Content

[0005] One objective of this application is to provide a new technical solution for a self-balancing shear gate assembly.

[0006] According to a first aspect of this application, a self-balancing shear gate assembly is provided for shearing drill pipe. The self-balancing shear gate assembly includes a drive unit, a shearing device, and blades; the shearing device includes a first gate body and a second gate body disposed opposite to each other, the first gate body and the second gate body being connected to two drive units disposed opposite to each other, the two drive units respectively driving the first gate body and the second gate body to move towards each other or away from each other along the radial direction of the drill pipe; the first gate body and the second gate body are each provided with blades, the two blades being disposed on opposite sides of the drill pipe, and the horizontal distance between the midpoints of the two oppositely disposed blades is greater than [missing information]. The distance between the ends of the two blades; wherein, the first gate body has an insertion groove, and the blade of the second gate body has an insertion portion, the insertion portion being adapted to the insertion groove, when the first gate body and the second gate body move toward each other to a preset position, the insertion portion is embedded in the insertion groove, and a shearing space for accommodating the drill rod is formed between the two blades arranged opposite each other, the first gate body and the second gate body forming a limiting fit in the axial direction of the drill rod, and when the insertion portion is fully embedded in the insertion groove, the two blades cut the drill rod.

[0007] Optionally, the first gate body has insertion slots at both ends along the horizontal direction, the insertion slots being located below the blade of the first gate body, and the blade of the second gate body has insertion portions at both ends along the horizontal direction.

[0008] Optionally, both the insertion part and the insertion slot are provided with a sealing element.

[0009] Optionally, the driving device includes a gate shaft and a driver, with the opposite ends of the gate shaft connected to the driver and the shearing device, respectively.

[0010] Optionally, both the first gate body and the second gate body are provided with horizontal guide grooves. One end of the gate shaft is connected to the telescopic end of the driver, and the other end is embedded in the horizontal guide groove. The gate shaft and the horizontal guide groove form a limiting fit along the axial direction of the drill rod.

[0011] Optionally, the self-balancing shear gate assembly further includes a housing, the housing having a receiving cavity, a shearing hole being formed on the housing, the shearing hole penetrating the receiving cavity and communicating with the receiving cavity, and the shearing device being disposed within the receiving cavity.

[0012] Optionally, the self-balancing shear gate assembly further includes a connector, which is detachably connected to the housing. The connector and the housing form a limiting fit along the axial direction of the shear hole. The connector is disposed between the drive device and the housing. The drive end of the drive device extends through the connector into the receiving cavity of the housing. The connector is disposed at opposite ends of the housing.

[0013] Optionally, the connector is provided with a limiting protrusion, and the housing is provided with a limiting hole that matches the limiting protrusion. When the connector is connected to the housing, the limiting protrusion is embedded in the limiting hole.

[0014] Optionally, a groove is provided on the side of the connector opposite to the limiting protrusion, the groove being adapted to the driving device, and the groove forming a limiting fit with the driving device.

[0015] According to a second aspect of this application, a blowout prevention system is provided, the system including the drill rod and a self-balancing shear gate assembly as described above, the drill rod being located between the first gate body and the second gate body, and when the first gate body and the second gate body move toward each other to a preset position, the two oppositely arranged blades are capable of shearing the drill rod.

[0016] In this embodiment, a driving device drives the first and second gate bodies to move towards or away from each other, thereby enabling two opposing blades to shear the drill rod located between the first and second gate bodies. The insertion groove on the first gate body is adapted to the insertion part on the blade of the second gate body, and a limiting fit is formed in the axial direction of the drill rod. When the first and second gate bodies move towards each other to a preset position, the insertion part gradually embeds into the insertion groove. Through the fit between the insertion part and the insertion groove, the first and second gate bodies are connected as a whole to form a support, effectively reducing the downward force caused by the drill rod during the shearing process, and effectively reducing the friction between the first and second gate bodies. The relative displacement between the bodies, and in this state, a shearing space for accommodating the drill pipe is formed between the two oppositely arranged blades. The insertion part is gradually embedded into the insertion slot, so that the size of the shearing space in the radial direction of the drill pipe gradually decreases, thereby playing a role in positioning and clamping the drill pipe, reducing the amplitude of drill pipe sway, so as to facilitate shearing. During the process of the insertion part gradually being embedded into the insertion slot, the blades on the first gate body and the blades on the second gate body gradually press the drill pipe in the horizontal direction and shear the drill pipe until the drill pipe is cut off. At this time, the insertion part is completely embedded in the insertion slot. Through the insertion and cooperation of the insertion slot and the insertion part, the sealing effect after the drill pipe is cut off is effectively improved, and the safety of drilling operations is improved.

[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 structure of the self-balancing shear gate assembly in the embodiments of this application;

[0020] Figure 2 This is an exploded structural diagram of the self-balancing shear gate assembly in the embodiments of this application;

[0021] Figure 3 yes Figure 2 Enlarged schematic diagram of the shearing device.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1-Drive unit; 11-Gate shaft; 12-Driver;

[0024] 2-Shearing device; 21-First gate body; 211-Insertion groove; 22-Second gate body; 221-Insertion part; 23-Seal; 24-Horizontal guide groove;

[0025] 3-blade;

[0026] 4-Shearing hole; 41-Receiving cavity; 42-Shearing hole; 43-Limiting hole;

[0027] 5-Connector; 51-Limiting protrusion; 52-Groove. Detailed Implementation

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] According to one embodiment of this application, a self-balancing shear gate assembly is provided for shearing drill pipe. The self-balancing shear gate assembly includes a drive device 1, a shearing device 2, and blades 3. The shearing device 2 includes a first gate body 21 and a second gate body 22 disposed opposite to each other. The first gate body 21 and the second gate body 22 are connected to two drive devices 1 disposed opposite to each other. The two drive devices 1 respectively drive the first gate body 21 and the second gate body 22 to move towards each other or away from each other along the radial direction of the drill pipe. Blades 3 are provided on both the first gate body 21 and the second gate body 22, and the two blades 3 are disposed on opposite sides of the drill pipe. The horizontal center-to-center distance between the blades 3 is greater than the end-to-end distance between the two blades 3; wherein, the first gate body 21 has an insertion groove 211, and the second gate body 22 has an insertion part 221, the insertion part 221 is adapted to the insertion groove 211, when the first gate body 21 and the second gate body 22 move toward each other to a preset position, the insertion part 221 is embedded in the insertion groove 211, and a shearing space for accommodating the drill rod is formed between the two blades 3 arranged opposite to each other, the first gate body 21 and the second gate body 22 form a limiting fit in the axial direction of the drill rod, and when the insertion part 221 is completely embedded in the insertion groove 211, the two blades 3 cut the drill rod.

[0034] like Figures 1 to 3 As shown, the shearing device 2 includes a first gate body 21 and a second gate body 22. The first gate body 21 and the second gate body 22 are respectively connected to a driving device 1. The driving device 1 can drive the first gate body 21 and the second gate body 22 to approach each other until the first gate body 21 and the second gate body 22 are connected, and the drill rod is sheared by the blades 3 on the first gate body 21 and the second gate body 22.

[0035] The first gate body 21 has an insertion groove 211, and the second gate body 22 has an insertion portion 221. The insertion groove 211 of the first gate body 21 and the insertion portion 221 of the second gate body 22 are arranged opposite to each other. Two driving devices 1 drive the first gate body 21 and the second gate body 22 to move towards each other, causing the blades 3 of the first gate body 21 and the second gate body 22 to gradually approach the drill rod, and a shearing space for accommodating the drill rod is formed between the two blades 3. As the insertion portion 221 gradually embeds into the insertion groove 211, the two blades 3 gradually approach the drill rod, causing the radial dimension of the shearing space along the drill rod to gradually decrease. The insertion portion 221 of the second gate body 22 is embedded into the insertion groove 211 of the first gate body 21. The first gate body 21 and the second gate body 22 support each other to form a single unit, thereby reducing the vertical offset of the first gate body 21 and the second gate body 22 and effectively improving the sealing effect of the shearing device 2.

[0036] like Figures 1 to 3 As shown, both the first gate body 21 and the second gate body 22 are equipped with blades 3. Driven by the driving device 1, the first gate body 21 and the second gate body 22 move towards each other, causing the blades 3 on the first gate body 21 and the second gate body 22 to approach each other. The lower surface of the blade 3 on the first gate body 21 is in contact with the lower surface of the blade 3 on the second gate body 22, thus shearing the drill rod located between the two blades 3. In this state, the insertion part 221 of the second gate body 22 is located within the insertion groove 211 of the first gate body 21, making the first gate body 21 and the second gate body 22 a unified support structure, effectively improving the sealing effect after shearing the drill rod.

[0037] When the first gate body 21 and the second gate body 22 move in opposite directions, the horizontal distance between the two blades 3 gradually increases, and the insertion part 221 of the second gate body 22 gradually disengages from the insertion groove 211 of the first gate body 21 to facilitate the next shearing and sealing.

[0038] The cutting edge of the blade 3 is arc-shaped, meaning that the two ends of the cutting edge protrude from the middle of the blade along the radial direction of the drill rod. The cutting edge of the blade 3 on the first gate plate body 21 is recessed to the side away from the second gate plate body 22, and the cutting edge of the blade 3 on the second gate plate body 22 is recessed to the side away from the first gate plate body 21. By designing the blade 3 as an arc-shaped structure, the first gate plate body 21 and the second gate plate body 22 can move towards each other during the shearing of the drill rod, so that the insertion part 221 connects with the insertion groove 211 earlier than the blade 3 cuts the drill rod. Then, the first gate plate body 21 and the second gate plate body 22 are connected through the insertion part 221 and the insertion groove 211, which effectively improves the support strength of the shearing device 2 during the shearing process, reduces the sinking force caused by the drill rod during the shearing process, and thus reduces the relative displacement of the first gate plate body 21 and the second gate plate body 22 during the shearing process.

[0039] In this embodiment, a driving device drives the first and second gate bodies to move towards or away from each other, thereby enabling two opposing blades to shear the drill rod located between the first and second gate bodies. The insertion groove on the first gate body is adapted to the insertion part on the blade of the second gate body, and a limiting fit is formed in the axial direction of the drill rod. When the first and second gate bodies move towards each other to a preset position, the insertion part gradually embeds into the insertion groove. Through the fit between the insertion part and the insertion groove, the first and second gate bodies are connected as a whole to form a support, effectively reducing the downward force caused by the drill rod during the shearing process, and effectively reducing the friction between the first and second gate bodies. The relative displacement between the bodies, and in this state, a shearing space for accommodating the drill pipe is formed between the two oppositely arranged blades. The insertion part is gradually embedded into the insertion slot, so that the size of the shearing space in the radial direction of the drill pipe gradually decreases, thereby playing a role in positioning and clamping the drill pipe, reducing the amplitude of drill pipe sway, so as to facilitate shearing. During the process of the insertion part gradually being embedded into the insertion slot, the blades on the first gate body and the blades on the second gate body gradually press the drill pipe in the horizontal direction and shear the drill pipe until the drill pipe is cut off. At this time, the insertion part is completely embedded in the insertion slot. Through the insertion and cooperation of the insertion slot and the insertion part, the sealing effect after the drill pipe is cut off is effectively improved, and the safety of drilling operations is improved.

[0040] In one example, the first gate body 21 has insertion slots 211 at both opposite ends along the horizontal direction, the insertion slots 211 being located below the blade 3 of the first gate body 21, and the blade 3 of the second gate body 22 has insertion portions 221 at both opposite ends along the horizontal direction.

[0041] like Figures 1 to 3 As shown, when the first gate body 21 and the second gate body 22 move toward each other and shear the drill rod, the blade 3 of the first gate body 21 is located above the blade 3 of the second gate body 22. In this state, the insertion part 221 of the second gate body 22 is embedded in the insertion slot 211 of the first gate body 21.

[0042] The insertion slot 211 is a through slot provided below the blade 3 of the first gate body 21. The slotting direction of the through slot extends from the first gate body 21 to the second gate body 22, and an opening is provided on the side of the through slot near the second gate body 22, so that the insertion part 221 of the second gate body 22 can be inserted into the through slot through the opening.

[0043] The insertion part 221 is a protrusion at both ends of the blade 3 of the second gate body 22. The protrusion is adapted to the insertion groove 211 of the first gate body 21. By embedding the insertion part 221 into the insertion groove 211, the first gate body 21 and the second gate body 22 are fitted together to form an integral unit, which effectively improves the connection strength of the first gate body 21 and the second gate body 22 in the axial direction of the drill rod and prevents the first gate body 21 and the second gate body 22 from shifting vertically, causing the shearing blade 3 to fail to seal.

[0044] Of course, the insertion part 221 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 insertion part 221 and the blade 3 of the second gate body 22 are an integral structure, that is, the dimension of the blade 3 of the second gate body 22 in the horizontal direction is larger than the dimension of the blade 3 of the first gate body 21 in the horizontal direction, and the opposite ends of the blade 3 of the second gate body 22 in the horizontal direction can be embedded in the insertion slot 211.

[0045] In one example, both the insertion portion 221 and the insertion slot 211 are provided with a seal 23.

[0046] like Figures 1 to 3 As shown, both the first gate body 21 and the second gate body 22 are provided with sealing elements 23. The sealing elements 23 are located on the outside of the insertion part 221 and the outside of the insertion groove 211. The sealing effect of the shearing device 2 is enhanced by providing sealing elements 23.

[0047] For example, the insertion groove 211 of the first gate body 21 is a long strip through groove structure, the shape of the seal 23 of the insertion groove 211 is adapted to the shape of the through groove, the seal 23 of the insertion groove 211 is long strip, and a rod is provided at one end of the seal 23.

[0048] Sealing grooves are provided on both opposite sides of the first gate plate body 21. The sealing grooves are located outside the insertion groove 211, and insertion holes adapted to the insertion rod are provided on the side walls of the sealing grooves. When assembling the sealing element 23 with the first gate plate body 21, the sealing element 23 is inserted into the sealing groove from the second gate plate body 22 toward the first gate plate body 21, 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 23, but also effectively improves the connection strength between the sealing element 23 and the sealing groove.

[0049] In one example, the drive device 1 includes a gate shaft 11 and a driver 12, with the opposite ends of the gate shaft 11 connected to the driver 12 and the shearing device 2, respectively.

[0050] like Figures 1 to 3As shown, the actuator 12 can be a hydraulic pump or similar device. The actuator 12 is connected to the shearing device 2 via the gate shaft 11. The gate shaft 11 and the actuator 12 are connected to opposite sides of the shearing device 2, respectively, to drive the first gate body 21 and the second gate body 22 to move towards each other or away from each other, thereby enabling the two oppositely arranged blades to cut the drill rod.

[0051] In one example, both the first gate body 21 and the second gate body 22 are provided with horizontal guide grooves 24. One end of the gate shaft 11 is connected to the telescopic end of the driver 12, and the other end is embedded in the horizontal guide groove 24. The gate shaft 11 and the horizontal guide groove 24 form a limiting fit along the axial direction of the drill rod.

[0052] like Figures 1 to 3 As shown, a horizontal guide groove 24 is provided on the side of the first gate body 21 opposite to the second gate body 22, and a horizontal guide groove 24 is provided on the side of the second gate body 22 opposite to the first gate body 21.

[0053] The horizontal guide groove 24 is a long, narrow through-slot structure. This through-slot extends horizontally from the middle of the first gate body 21 to the edge. The end of the gate shaft 11 is embedded in the horizontal guide groove 24 and connected to the middle of the end face of the first gate body 21. By connecting the horizontal guide groove 24 to the gate shaft 11, the vertical displacement of the first gate body 21 and the second gate body 22 within the blowout preventer gate cavity can be effectively reduced.

[0054] A horizontal guide groove 24 is provided on the side of the second gate body 22 that is away from the first gate body 21. The guide groove extends in the opposite direction to the guide groove of the first gate body 21.

[0055] The second gate body 22 has the same structure as the first gate body 21, and the second gate body 22 is arranged opposite to the first gate body 21.

[0056] In one example, the self-balancing shear gate assembly further includes a housing 4, the housing 4 having a receiving cavity 41, a shearing hole 42 provided on the housing 4, the shearing hole 42 penetrating the receiving cavity 41 and communicating with the receiving cavity 41, and the shearing device 2 being disposed within the receiving cavity 41.

[0057] like Figures 1 to 3As shown, the housing 4 is rectangular in shape. A receiving cavity 41 is formed inside the housing 4. A shearing hole 42 is formed on the housing 4, penetrating not only the housing 4 but also communicating with the receiving cavity 41. The receiving cavity 41 is used to house the shearing device 2, and the telescopic end of the driver 12 extends into the receiving cavity 41 and connects to the shearing device 2. The drill rod passes through the receiving cavity 41 via the shearing hole 42 and is located between the first gate plate body 21 and the second gate plate body 22. The driver 12 drives the first gate plate body 21 and the second gate plate body 22 to move towards each other, so that the first gate plate body 21 and the second gate plate body 22 cooperate to form a support, improving the axial connection strength between the first gate plate body 21 and the second gate plate body 22, reducing the vertical displacement of the first gate plate body 21 and the second gate plate body 22 during the shearing of the drill rod, and causing the blades 3 on the first gate plate body 21 and the second gate plate body 22 to approach each other to shear the drill rod, achieving a seal.

[0058] In one example, the housing 4 of the self-balancing shear gate assembly further includes a connector 5, which is detachably connected to the housing 4. The connector 5 and the housing 4 form a limiting fit along the axial direction of the shear hole 42. The connector 5 is disposed between the drive device 1 and the housing 4. The drive end of the drive device 1 extends through the connector 5 into the receiving cavity 41 of the housing 4. The connector 5 is respectively disposed at opposite ends of the housing 4.

[0059] like Figures 1 to 3 As shown, the connector 5 is a rectangular block, and connectors 5 are respectively provided at opposite ends of the housing 4. The connector 5 is located between the drive unit 1 and the housing 4. The housing 4 and the connector 5 are detachably connected by bolts.

[0060] Of course, the housing 4 and connector 5 in this embodiment are not limited to the above-described structure, and those skilled in the art can make modifications according to actual needs. For example, detachable connections can also be achieved by means of fitting or snap-fitting.

[0061] The connector 5 is provided with a through hole, and the driving end of the driving device 1 extends into the receiving cavity 41 through the through hole and is connected to the shearing device 2.

[0062] By setting the connector 5 to form a limiting fit with the housing 4 along the axial direction of the shearing hole 42, the stability of the housing 4 in the axial direction is effectively improved, thereby further reducing the relative displacement between the first gate body 21 and the second gate body 22, effectively improving the sealing effect after shearing the drill pipe and the safety of drilling operations.

[0063] In one example, the connector 5 is provided with a limiting protrusion 51, and the housing 4 is provided with a limiting hole 43 that is adapted to the limiting protrusion 51. When the connector 5 is connected to the housing 4, the limiting protrusion 51 is embedded in the limiting hole 43.

[0064] like Figures 1 to 3 As shown, the connector 5 has a limiting protrusion 51 on the side near the housing 4. The housing 4 has a limiting hole 43 on the side near the connector 5 that matches the limiting protrusion 51. The limiting hole 43 is oblong in shape, and the shape of the limiting protrusion 51 matches the shape of the limiting hole 43.

[0065] When the connector 5 and the housing 4 are connected, the limiting protrusion 51 is embedded in the limiting hole 43, and a sealing gasket is provided in the limiting hole 43. The sealing effect of the shear gate assembly is improved by providing a sealing gasket in the limiting hole 43.

[0066] In one example, the connector 5 has a groove 52 on the side opposite to the limiting protrusion 51. The groove 52 is adapted to the driving device 1, and the groove 52 and the driving device 1 form a limiting fit.

[0067] like Figures 1 to 3 As shown, the side of the connector 5 opposite to the limiting protrusion 51 has a groove 52. The groove 52 is adapted to the driver 12 of the drive device 1. By setting the groove 52 to limit the relative position of the driver 12 and the connector 5 in the connected state, it can not only effectively improve the connection accuracy between the drive device 1 and the shearing device 2, but also effectively improve the overall connection stability of the device, reduce the relative position offset amplitude generated during the shearing process, and further improve the sealing effect of the shearing gate assembly.

[0068] According to another embodiment of this application, a blowout prevention system is provided, which includes a drill rod and a self-balancing shear gate assembly as described above. The drill rod is located between the first gate body 21 and the second gate body 22. When the first gate body 21 and the second gate body 22 move toward each other to a preset position, the two oppositely arranged blades 3 can shear the drill rod.

[0069] In this embodiment, the self-balancing shearing gate assembly is used to shear and cut the drill rod. The drill rod is tubular and located between the first gate body 21 and the second gate body 22. The first gate body 21 and the second gate body 22 are driven to move towards each other by the driving device 1, so that the insertion part 221 of the second gate body 22 is embedded into the insertion groove 211 of the first gate body 21. This connects the first gate body 21 and the second gate body 22 to form a support and become an integral unit, thereby enhancing the bearing strength of the first gate body 21 and the second gate body 22 in the axial direction of the drill rod. As the first gate body 21 and the second gate body 22 gradually approach each other, the insertion part 221 is embedded in the insertion groove 211, causing the distance between the blades 3 on the first gate body 21 and the blades 3 on the second gate body 22 to gradually decrease until the drill pipe is sheared. At this time, the insertion part 221 of the second gate body 22 is embedded in the insertion groove 211 of the first gate body 21. Through the cooperation between the insertion part 221 and the insertion groove 211, the first gate body 21 and the second gate body 22 form a support and become an integral unit, effectively reducing the relative displacement between the first gate body 21 and the second gate body 22, thereby effectively improving the sealing effect after shearing the drill pipe and improving the safety of drilling operations.

[0070] 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 self-balancing shear gate assembly for shearing drill pipe, characterized in that, include: Drive unit (1); The shearing device (2) includes a first gate body (21) and a second gate body (22) arranged opposite to each other. The first gate body (21) and the second gate body (22) are connected to two driving devices (1) arranged opposite to each other. The two driving devices (1) respectively drive the first gate body (21) and the second gate body (22) to move towards each other or away from each other along the radial direction of the drill rod. Blade (3), the first gate body (21) and the second gate body (22) are both provided with the blade (3), the two blades (3) are provided on opposite sides of the drill rod, and the mid-distance between the two blades (3) arranged opposite each other in the horizontal direction is greater than the end distance between the two blades (3); The first gate body (21) has an insertion groove (211), and the blade (3) of the second gate body (22) has an insertion part (221). The insertion part (221) is adapted to the insertion groove (211). When the first gate body (21) and the second gate body (22) move towards each other to a preset position, the insertion part (221) is embedded in the insertion groove (211), and a shearing space for accommodating the drill rod is formed between the two blades (3) arranged opposite to each other. The first gate body (21) and the second gate body (22) form a limiting fit in the axial direction of the drill rod. When the insertion part (221) is fully embedded in the insertion groove (211), the two blades (3) cut off the drill rod.

2. The self-balancing shear gate assembly according to claim 1, characterized in that, The first gate body (21) has insertion slots (211) at both ends of the horizontal direction. The insertion slots (211) are located below the blade (3) of the first gate body (21). The blade (3) of the second gate body (22) has insertion portions (221) at both ends of the horizontal direction.

3. The self-balancing shear gate assembly according to claim 2, characterized in that, Both the insertion part (221) and the insertion slot (211) are provided with a sealing element (23).

4. The self-balancing shear gate assembly according to claim 1, characterized in that, The drive device (1) includes a gate shaft (11) and a driver (12), with the two ends of the gate shaft (11) connected to the driver (12) and the shearing device (2) respectively.

5. The self-balancing shear gate assembly according to claim 4, characterized in that, Both the first gate body (21) and the second gate body (22) are provided with horizontal guide grooves (24). One end of the gate shaft (11) is connected to the telescopic end of the driver (12), and the other end is embedded in the horizontal guide groove (24). The gate shaft (11) and the horizontal guide groove (24) form a limiting fit along the axial direction of the drill rod.

6. The self-balancing shear gate assembly according to claim 1, characterized in that, It also includes a housing (4), which has a receiving cavity (41) and a shearing hole (42) is provided on the housing (4). The shearing hole (42) penetrates the receiving cavity (41) and is connected to the receiving cavity (41). The shearing device (2) is disposed in the receiving cavity (41).

7. The self-balancing shear gate assembly according to claim 6, characterized in that, It also includes a connector (5), which is detachably connected to the housing (4). The connector (5) and the housing (4) form a limiting fit along the axial direction of the shear hole (42). The connector (5) is disposed between the driving device (1) and the housing (4). The driving end of the driving device (1) extends through the connector (5) into the receiving cavity (41) of the housing (4). The connecting member (5) is provided at each of the opposite ends of the housing (4).

8. The self-balancing shear gate assembly according to claim 7, characterized in that, The connector (5) is provided with a limiting protrusion (51), and the housing (4) is provided with a limiting hole (43) that is adapted to the limiting protrusion (51). When the connector (5) is connected to the housing (4), the limiting protrusion (51) is embedded in the limiting hole (43).

9. The self-balancing shear gate assembly according to claim 8, characterized in that, The connector (5) has a groove (52) on the side opposite to the limiting protrusion (51). The groove (52) is adapted to the driving device (1) and the groove (52) and the driving device (1) form a limiting fit.

10. A blowout prevention system, characterized in that, Includes the drill rod and the self-balancing shear gate assembly as described in any one of claims 1-9. The drill rod is located between the first gate body (21) and the second gate body (22). When the first gate body (21) and the second gate body (22) move toward each other to a preset position, the two oppositely arranged blades (3) can cut the drill rod.

Images