Drilling blowout preventer

Abstract

The application provides a drilling blowout preventer, which comprises a base, an opening, a mounting cavity and an avoiding opening, the opening is located at the top of the mounting cavity, the avoiding opening is located at the bottom of the mounting cavity, the opening and the avoiding opening are communicated with the mounting cavity, and a drill rod is sequentially penetrated through the opening, the mounting cavity and the avoiding opening; the clamping part comprises two clamping assemblies which are oppositely arranged on the base and can approach or move away from each other; the sealing part comprises two sealing assemblies which are one-to-one correspondingly arranged with the two clamping assemblies, the sealing assemblies are at least partially located in the mounting cavity, the two sealing assemblies have a sealing state of moving towards each other to clamp the drill rod and an initial state of moving away from each other, and when the sealing assemblies are in the sealing state, the two sealing assemblies are arranged around the outer periphery of the drill rod to block the outer periphery of the drill rod. The technical scheme of the application can solve the problem of poor sealing effect of the sealing part in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drilling equipment, in particular to a drilling blowout prevention device. BACKGROUND

[0002] When carrying out coal mining or geological exploration, drilling work needs to be carried out on the working face to explore the geological environment around the working face. However, as the drilling work proceeds, water flow is prone to be sprayed at the drilling hole, which affects the construction site. At present, a plugging device is mainly sleeved on the drill rod to prevent water flow from being sprayed during drilling work.

[0003] The plugging device in the prior art is generally sleeved on the drill rod and enters the drilling hole along with the drill bit to plug the space between the drill rod and the inner wall of the drilling hole, thereby achieving the effect of plugging and preventing blowout of the drilling hole. However, if the plugging device is subjected to the force of water flow during the process of entering the drilling hole along with the drill rod, the plugging device may not be able to enter the drilling hole, and the part of the plugging device that has already entered the drilling hole is also prone to be pushed out by the water flow and lose the plugging effect. SUMMARY

[0004] The present application provides a drilling blowout prevention device to solve the problem of poor plugging effect of the plugging member in the prior art.

[0005] The present application provides a drilling blowout prevention device, which comprises a base for installation at a drilling hole, the base having an opening, a mounting cavity and an avoiding opening, the opening being located at the top of the mounting cavity, the avoiding opening being located at the bottom of the mounting cavity, and the opening and the avoiding opening being in communication with the mounting cavity, the drill rod being sequentially inserted through the opening, the mounting cavity and the avoiding opening; a clamping part, the clamping part comprising two clamping assemblies, the two clamping assemblies being oppositely arranged on the base, the two clamping assemblies being capable of moving towards or away from each other; a sealing part, the sealing part comprising two sealing assemblies, the two sealing assemblies being correspondingly arranged with the two clamping assemblies, the sealing assembly being at least partially located in the mounting cavity, the two sealing assemblies having a sealing state of moving towards each other to clamp the drill rod and an initial state of moving away from each other, when the sealing assembly is in the sealing state, the two sealing assemblies being arranged around the outer periphery of the drill rod to plug the outer periphery of the drill rod.

[0006] Further, each clamping assembly has a clamping end, the clamping ends of the two clamping assemblies being oppositely arranged, the sealing assembly comprising a sliding block and a sealing member, the sliding block being arranged on the clamping end, the sliding block being capable of rotating along the drill rod relative to the clamping end, the sealing member being arranged on the sliding block, the sealing members of the two sealing assemblies being cooperated with each other to be arranged around the outer periphery of the drill rod.

[0007] Further, the clamping end is provided with a sliding groove, a protrusion is arranged on the side wall of the sliding block close to the clamping end, the protrusion extends along the circumference of the sliding block, the protrusion is movably arranged in the sliding groove, and the protrusion and the sliding groove cooperate to enable the sliding block to rotate relative to the clamping end.

[0008] Further, the sliding groove has oppositely arranged openings and a groove bottom in the radial direction of the mounting cavity, the openings of the sliding groove are located on the inner wall of the clamping end, the width dimension of the openings is smaller than the width dimension of the groove bottom, the protrusion has oppositely arranged first and second ends in the radial direction of the mounting cavity, the first end is connected with the outer side wall of the sliding block, the dimension of the first end is matched with the dimension of the openings, and the dimension of the second end is matched with the dimension of the groove bottom, so as to limit the radial displacement of the sliding block relative to the clamping end.

[0009] Further, the sealing part further comprises an air bag, the air bag is arranged between the outer side wall of each clamping assembly and the inner wall of the mounting cavity, and the air bag is used for sealing the gap between the mounting cavity and the sealing assembly.

[0010] Further, the clamping assembly comprises: a mounting frame movably arranged on the base; and a mounting block arranged on the mounting frame, the mounting block forming the clamping end.

[0011] Further, the mounting frame is provided with a guide column extending in the axial direction of the mounting cavity, the mounting block is movably arranged on the guide column, and the sealing part can move along the axis of the mounting cavity by the mounting block.

[0012] Further, the drilling blowout prevention device further comprises: a drive screw comprising a first segment and a second segment connected in sequence, threads are arranged on the first segment and the second segment, the directions of the threads on the first segment and the second segment are opposite, one mounting frame of the two clamping assemblies is threadedly connected with the first segment, the other mounting frame is threadedly connected with the second segment, the drive screw drives the two mounting frames to move close to or away from each other; and a guide rail arranged on the base, the two mounting frames are movably arranged on the guide rail, and the two mounting frames are located on the two sides of the mounting cavity respectively, and the extension direction of the guide rail is the same as the extension direction of the drive screw.

[0013] Further, the inner wall of the drilling hole has a mounting groove, one end of the mounting groove extends to the top of the drilling hole, the base comprises: a bottom plate having an opening, the clamping part is arranged above the bottom plate; a sleeve arranged below the bottom plate, a cavity in the sleeve forms the mounting cavity, the bottom of the sleeve has a avoiding opening, the sleeve has a fixing plate on one side of the opening, the sleeve is connected with the bottom plate through the fixing plate, a fastener is arranged on the side wall of the sleeve, the fastener is arranged corresponding to the mounting groove, the fastener is used for connecting with the mounting groove to fix the sleeve in the drilling hole; and a plugging piece arranged on the outer wall of the sleeve and corresponding above the fastener, the plugging piece is used for plugging one end of the mounting groove located at the top of the drilling hole.

[0014] Further, the base further comprises a sealing ring sleeved on the fastener, and the sealing ring is used for sealing the gap between the fastener and the mounting groove.

[0015] According to the technical scheme of the present application, the base is arranged to fix the blowout preventer on the borehole, the sealing part is clamped by the clamping part to tightly hold the drill pipe, the sealing part is fixed, and the effect of sealing the borehole and preventing water flow from being sprayed out can be achieved. In the conventional technical scheme, the plugging device is affected by the force of water flow during the working process of entering the borehole with the drill pipe, and the plugging device cannot enter the borehole or is even washed out of the borehole. The clamping part can clamp and fix the sealing part, prevent the sealing part from being washed out of the borehole by water flow, and improve the sealing performance of the borehole. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the application, and together with the description, explain the application. The present application is shown in the drawings as follows:

[0017] Figure 1 A side view of the borehole blowout preventer provided by the present application is shown;

[0018] Figure 2 Another side view of the borehole blowout preventer provided by the present application is shown;

[0019] Figure 3 A cross-sectional view of the borehole blowout preventer provided by the present application is shown;

[0020] Figure 4 A structure schematic view of the sleeve provided by the present application is shown;

[0021] Figure 5 A structure schematic view of the borehole provided by the present application is shown.

[0022] Among the above drawings, the following reference signs are included:

[0023] 10, base; 11, bottom plate; 12, sleeve; 121, mounting cavity; 122, fixing plate; 123, fastener; 124, plugging piece; 125, sealing ring; 126, avoiding opening;

[0024] 20, clamping part; 21, mounting frame; 211, guide column; 22, mounting block;

[0025] 30, sealing part; 31, sliding block; 32, sealing piece; 33, air bag;

[0026] 40, drive screw; 41, guide rail;

[0027] 100, borehole; 101, mounting groove; 200, drill rod. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and not intended to limit the present application and its applications or uses in any way. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0029] As shown in Figures 1 to 3 The present application provides a borehole blowout preventer, which comprises a base 10, a clamping part 20 and a sealing part 30. The base 10 is used to be installed at a borehole 100. The base 10 has an opening, a mounting cavity 121 and an avoiding opening 126. The opening is located at the top of the mounting cavity 121, and the avoiding opening 126 is located at the bottom of the mounting cavity 121. Both the opening and the avoiding opening 126 are in communication with the mounting cavity 121, and a drill rod 200 sequentially passes through the opening, the mounting cavity 121 and the avoiding opening 126. The clamping part 20 comprises two clamping assemblies, which are oppositely arranged on the base 10 and can move close to or away from each other. The sealing part 30 comprises two sealing assemblies, which are correspondingly arranged with the two clamping assemblies. The sealing assemblies are at least partially located in the mounting cavity 121. The two sealing assemblies have a sealing state of moving towards each other to clamp the drill rod 200 and an initial state of moving away from each other. When the sealing assemblies are in the sealing state, the two sealing assemblies are arranged around the outer periphery of the drill rod 200 to block the outer periphery of the drill rod 200.

[0030] According to the technical solutions of the present application, the base 10 can fix the borehole blowout preventer to the borehole 100. The clamping part 20 clamps the sealing part 30 to tightly hold the drill rod 200, which can fix the sealing part 30, thereby achieving the effects of sealing the borehole 100 and preventing water flow from being sprayed out. In the conventional technical solutions, the blocking device is affected by the force of water flow during the working process of entering the borehole with the drill rod, which causes the blocking device to be unable to enter the borehole or even be washed out of the borehole. The clamping action of the clamping part 20 can clamp and fix the sealing part 30, prevent the sealing part 30 from being washed out of the borehole by water flow, and improve the sealing performance of the borehole.

[0031] Specifically, when the two sealing assemblies are in the initial state of moving away from each other, a certain distance exists between the two sealing assemblies, facilitating the installation and replacement of the drill pipe 200, waiting for the installation and positioning of the drill pipe 200 to be completed, the two clamping assemblies move towards each other to clamp the two sealing assemblies, so that the two sealing assemblies switch to the sealing state, and the sealing effect on the outer circumference of the drill pipe 200 is realized. At this time, the drill pipe 200 sequentially penetrates the opening, the installation cavity 121 and the avoiding opening 126 of the base 10 to carry out drilling work, and the clamping effect of the clamping part 20 prevents the sealing part 30 from being washed out of the borehole with the water flow, thereby improving the sealing performance of the borehole.

[0032] Specifically, each clamping assembly has a clamping end, and the clamping ends of the two clamping assemblies are arranged towards each other. The sealing assembly includes a sliding block 31 and a sealing element 32. The sliding block 31 is arranged on the clamping end, and the sliding block 31 can rotate relative to the clamping end along the drill pipe 200. The sealing element 32 is arranged on the sliding block 31, and the sealing elements 32 of the two sealing assemblies cooperate with each other to surround the outer circumference of the drill pipe 200. Through the above arrangement, the sealing element 32 surrounds the outer circumference of the drill pipe 200 to realize the sealing of the drill pipe 200, so as to prevent the water flow from being sprayed from the drill pipe 200. The drill pipe 200 rotates in work to drive the sealing element 32 to rotate. The sealing element 32 is fixedly connected with the sliding block 31, and the sliding block can rotate relative to the clamping end. In this way, it can be ensured that the sealing element 32 surrounds the drill pipe 200 to play a sealing role, and the drill pipe 200 will not wear the sealing element 32 to lose the sealing effect, so as to ensure the sealing performance of the blowout preventer.

[0033] As shown in Figure 3 In a specific embodiment of the present application, the sealing element 32 includes a housing connected with the sliding block 31 and a sealing gasket surrounding the drill pipe 200. The inner wall of the housing and the outer wall of the sealing gasket are provided with pin holes, and a connecting pin is arranged in the pin hole. The sealing housing and the sealing gasket are fixed by the connecting pin shaft. The sealing gasket can be provided as a multi-layer structure, and the multi-layer sealing gasket is arranged in a stacked manner along the radial direction of the installation cavity 121. In this way, the inner diameter of the two sealing elements 32 can be adjusted according to the diameter of the drill pipe 200, and the sealing effect of the sealing element 32 can be ensured when different diameter specifications of the drill pipe 200 are used. In order to prevent the sealing gasket and the housing from slipping during the rotation of the drill pipe 200, the connecting pin can ensure the connection effect of the sealing gasket and the housing.

[0034] Further, the clamping end is provided with a sliding groove, a protrusion is arranged on the side wall of the sliding block 31 close to the clamping end, the protrusion extends along the circumference of the sliding block 31, the protrusion is movably arranged in the sliding groove, and the protrusion and the sliding groove cooperate to enable the sliding block 31 to rotate relative to the clamping end. Through the above arrangement, the sliding groove can guide the protrusion, and when the drill rod 200 is working, the sliding block 31 can rotate within the range limited by the sliding groove, thereby ensuring the stability of the rotation of the sliding block 31.

[0035] Specifically, the sliding groove has oppositely arranged openings and groove bottoms in the radial direction of the mounting cavity 121, the openings of the sliding groove are located on the inner wall of the clamping end, the width dimension of the openings is smaller than the width dimension of the groove bottoms, the protrusion has oppositely arranged first ends and second ends in the radial direction of the mounting cavity 121, the first ends are connected with the outer side walls of the sliding blocks 31, the dimensions of the first ends are adapted to the dimensions of the openings, and the dimensions of the second ends are adapted to the dimensions of the groove bottoms to limit the displacement of the sliding blocks 31 in the radial direction relative to the clamping end. Through the above arrangement, the sliding groove not only plays a guiding role in the rotation of the sliding blocks 31, but also prevents the sealing elements 32 from shaking due to water flow impact, limits the displacement of the sliding blocks 31 in the radial direction, and further improves the stability of the rotation of the sliding blocks 31.

[0036] As shown in Figure 3 The sealing part 30 further includes air bags 33 arranged between the outer side walls of each clamping assembly and the inner wall of the mounting cavity 121, and the air bags 33 are used to seal the gap between the mounting cavity 121 and the sealing assembly. Specifically, the outer side walls of the sealing elements 32 are circumferentially provided with receiving grooves for receiving the air bags 33, and when water flow injection occurs at the drill hole 100, the air bags 33 can be inflated to expand, thereby sealing the mounting cavity 121 and preventing water flow from overflowing out of the mounting cavity 121, and improving the sealing performance of the drill hole blowout prevention device.

[0037] Further, the clamping assembly includes a mounting frame 21 and a mounting block 22. The mounting frame 21 is movably arranged on the base 10, and the mounting block 22 is arranged on the mounting frame 21 and forms the clamping end. In this way, the manufacturing and installation of the clamping assembly can be facilitated. Specifically, the mounting block 22 and the sliding block 31 are both arc-shaped structures, the mounting block 22 is provided with a sliding groove to guide the rotation of the sliding block 31, and the central angle of the arc of the mounting block 22 is smaller than the central angle of the arc of the sliding block 31. In this way, when the sliding block 31 rotates, each sliding block 31 is located in at least one mounting block 22 to guide the sliding block 31, thereby preventing the sliding block 31 from falling off the mounting block 22 and ensuring the stability of the rotation of the sliding block 31.

[0038] Specifically, the mounting frame 21 is provided with a guide column 211 extending along the axial direction of the mounting cavity 121, and the mounting block 22 is movably arranged on the guide column 211, and the sealing part 30 can move along the axial direction of the mounting cavity 121 through the mounting block 22. In this way, the two sealing parts 30 can enter the mounting cavity 121 along the axial direction of the mounting cavity 121 in the sealing state, the bottom surfaces of the two sealing parts 30 are in contact with the bottom surface of the mounting cavity 121, the water flow is prevented from entering the mounting cavity 121, and the sealing effect is further improved. Specifically, the guide column 211 can be provided as two or more, as long as the guiding effect on the mounting block 22 can be achieved. In an embodiment of the present application, the guide column 211 is provided as two, and a limiting block is arranged on the mounting frame 21, the limiting block is located at the top of the guide column 211, and the limiting block serves to limit the movement range of the mounting block 22.

[0039] Further, the drilling blowout preventer further comprises a driving screw 40 and a guide rail 41. The driving screw 40 comprises a first segment and a second segment connected in sequence, and the first segment and the second segment are both provided with threads, and the thread directions of the first segment and the second segment are opposite, one of the two mounting frames 21 is threadedly connected with the first segment, and the other mounting frame 21 is threadedly connected with the second segment, and the driving screw 40 drives the two mounting frames 21 to move close to or away from each other. The guide rail 41 is arranged on the base 10, and the two mounting frames 21 are movably arranged on the guide rail 41, and the two mounting frames 21 are respectively located on the two sides of the mounting cavity 121, and the extension direction of the guide rail 41 is the same as the extension direction of the driving screw 40.

[0040] Through the above arrangement, the driving screw 40 drives the two mounting frames 21 to move towards each other, the guide rail 41 provides guidance for the mounting frames 21, the driving screw 40 cooperates with the guide rail 41 to drive the two sealing assemblies to switch between the initial position and the sealing position. Specifically, a plurality of supports are arranged on the base 10, the supports are provided with bearings, and the driving screw 40 passes through the plurality of supports in sequence to be arranged on the base 10 and threadedly connected with the mounting frames 21. In this way, the bearings can be used to reduce the resistance of the driving screw 40 during rotation, facilitating the operation of the operator and improving the work efficiency. In the present application, the guide rail 41 can be a plurality of guide rails, the plurality of guide rails 41 are arranged on the two sides of the opening and have the same extension direction as the driving screw 40, and the plurality of guide rails 41 are arranged on the two sides of the opening in a spaced manner, and two rows of guide rails are arranged on each side of the opening. The stability of the movement of the clamping assembly is improved; or the guide rails 41 can be arranged on the two sides of the opening opposite to the driving screw 40, and the guide rails 41 simultaneously guide the two clamping assemblies, facilitating the machining and installation of the guide rails 41.

[0041] As Figure 4 and Figure 5As shown, the inner wall of the drill hole 100 has a mounting groove 101, one end of the mounting groove 101 extends to the top of the drill hole 100, and the base 10 includes a bottom plate 11, a sleeve 12 and a sealing piece 124. Among them, the bottom plate 11 has an opening, and the clamping part 20 is arranged above the bottom plate 11. The sleeve 12 is arranged below the bottom plate 11, and the cavity in the sleeve 12 forms a mounting cavity 121. The bottom of the sleeve 12 has a avoiding opening 126, and the sleeve 12 has a fixed plate 122 on one side of the opening. The sleeve 12 is connected with the bottom plate 11 through the fixed plate 122. The sleeve 12 is provided with a fastener 123 on the side wall, and the fastener 123 is arranged corresponding to the mounting groove 101. The fastener 123 is used to connect with the mounting groove 101, so as to fix the sleeve 12 in the drill hole 100. The sealing piece 124 is arranged on the outer wall of the sleeve 12 and corresponds to the upper side of the fastener 123. The sealing piece 124 is used to seal one end of the mounting groove 101 located at the top of the drill hole 100. Through the above arrangement, the sleeve 12 can fix the base 10 in the drill hole 100, so as to stably fix the drill hole blowout prevention device on the working surface, prevent the drill hole blowout prevention device from moving when it is impacted by water flow with large pressure, cause the drill rod 200 to deviate, and then ensure the quality of drilling work. By arranging the sealing piece 124 to seal one end of the mounting groove 101 located at the top of the drill hole 100, when the underground water flow is ejected, the water flow can be prevented from flowing from the fastener 123 to the ground through the mounting groove 101 as far as possible.

[0042] Specifically, the fastener 123 can be a fastening bolt, and a plurality of fastening bolts are arranged along the axial direction of the sleeve 12. A plurality of screw holes are arranged on the side wall of the sleeve 12, and the fastening bolts are arranged through the screw holes and extend from the inner wall of the sleeve 12 to the drill hole, so as to play a fixing role on the base 10.

[0043] Further, the base 10 further includes a sealing ring 125, the sealing ring 125 is sleeved on the fastener 123, and the sealing ring 125 is used to seal the gap between the fastener 123 and the mounting groove 101. In this way, the sealing ring 125 can be used to block the water flow from entering the mounting cavity 121, and the sealing effect of the drill hole blowout prevention device is further improved.

[0044] In order to facilitate understanding, the following are specific working steps of the drill hole blowout prevention device:

[0045] 1. Open a drill hole 100 at a determined exploration position;

[0046] 2. Sink the base 10 into the drill hole 100, and fix the base 10 in the drill hole by using the fastener 123;

[0047] 3. The drill rod 200 passes through the opening, the mounting cavity 121 and the clearance opening 126 and enters the borehole 100. The clamping assembly clamps the sealing assembly, so that the sealing assembly changes from the initial state to the sealed state and surrounds the drill rod 200 for drilling work.

[0048] 4. If water spraying from borehole 100 is severe, the mounting block 22 can be operated to lower the sealing element 32, so that the bottom of the sealing element 32 abuts against the bottom of the mounting cavity 121, thereby further sealing the borehole 100.

[0049] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0050] 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 invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all 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. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0051] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0052] For purposes of the description hereinafter, the orientations in the various drawings will be described as shown in the drawings. However, it will be understood that the device can assume different orientations, e.g. viewed from the bottom, based on the application. Accordingly, the illustrative terms such as "above", "below", "upper", "lower", and the like are used as a shorthand notations to convey the relative positions of an object or feature as shown in the figures. It will be further appreciated that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device described is turned over, then a depiction that was previously described as "above" other parts or steps would then be oriented "below" other parts or steps. Thus, the exemplary term "above" can encompass both an "above" and "below" position depending on the particular orientation being referred to. Similarly, the terms "above" and "below" can include vertical orientations of the device as well as horizontal orientations of the device. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0053] In addition, it should be noted that the use of "first", "second", and the like words of comparison are used herein to describe various elements in the example embodiments. Such words of comparison are not intended to limit the scope of the present application to the specific elements to which such words are referring to unless otherwise indicated. Such words of comparison are used to distinguish one element from another element in the example embodiments.

[0054] The preferred embodiments of the present application have been described herein. The skilled person will understand that modifications and variations can be made to the described embodiments without departing from the spirit and scope of the present application. Any modification, equivalent replacement, improvement, and the like made within the spirit and principle of the present application shall be included in the scope of the present application.

Claims

1. A borehole blowout prevention device, characterized in that, The borehole blowout prevention device includes: A base (10) is used for mounting at a drill hole (100). The base (10) has an opening, a mounting cavity (121), and a clearance opening (126). The opening is located at the top of the mounting cavity (121), and the clearance opening (126) is located at the bottom of the mounting cavity (121). Both the opening and the clearance opening (126) are connected to the mounting cavity (121). The drill rod (200) is inserted sequentially through the opening, the mounting cavity (121), and the clearance opening (126). The clamping part (20) includes two clamping components, which are disposed opposite to each other on the base (10) and can move closer or further apart from each other; The sealing part (30) includes two sealing components, which are respectively arranged in correspondence with the two clamping components. The sealing components are at least partially located in the mounting cavity (121). The two sealing components have a sealing state in which they move towards each other to clamp the drill rod (200) and an initial state in which they move away from each other. When the sealing components are in the sealing state, the two sealing components surround the outer periphery of the drill rod (200) to seal the outer periphery of the drill rod (200). Each of the clamping assemblies has a clamping end, and the clamping ends of the two clamping assemblies are arranged facing each other. The sealing assembly includes a sliding block (31) and a sealing element (32). The sliding block (31) is disposed on the clamping end and is rotatable relative to the clamping end along the drill rod (200). The sealing element (32) is disposed on the sliding block (31). The sealing elements (32) of the two sealing assemblies cooperate with each other to surround the outer periphery of the drill rod (200). The clamping end is provided with a sliding groove, and the side wall of the sliding block (31) near the clamping end is provided with a protrusion. The protrusion extends circumferentially along the sliding block (31) and is movably disposed in the sliding groove. The protrusion and the sliding groove cooperate to enable the sliding block (31) to rotate relative to the clamping end. The groove has an opening and a bottom that are oppositely arranged along the radial direction of the mounting cavity (121). The opening of the groove is located on the inner wall of the clamping end. The width of the opening is smaller than the width of the bottom of the groove. The protrusion has a first end and a second end that are oppositely arranged along the radial direction of the mounting cavity (121). The first end is connected to the outer wall of the sliding block (31). The size of the first end is adapted to the size of the opening. The size of the second end is adapted to the size of the bottom of the groove, so as to limit the radial displacement of the sliding block (31) relative to the clamping end. The clamping assembly includes: Mounting bracket (21) is movably mounted on the base (10); Mounting block (22), which is disposed on the mounting frame (21) and forms the clamping end; The mounting bracket (21) is provided with a guide post (211), which extends along the axial direction of the mounting cavity (121). The mounting block (22) is movably disposed on the guide post (211), and the sealing part (30) can move relative to the mounting cavity (121) along the axial direction of the mounting cavity (121) via the mounting block (22).

2. The blowout prevention device according to claim 1, characterized in that, The sealing part (30) further includes an airbag (33) disposed between the outer wall of each clamping assembly and the inner wall of the mounting cavity (121), the airbag (33) being used to seal the gap between the mounting cavity (121) and the sealing assembly.

3. The blowout prevention device according to claim 1, characterized in that, The borehole blowout prevention device also includes: The drive screw (40) includes a first section and a second section connected in sequence. Both the first section and the second section are provided with threads, and the threads on the first section and the second section are in opposite directions. One of the two clamping assemblies, the mounting bracket (21), is threadedly connected to the first section, and the other mounting bracket (21) is threadedly connected to the second section. The drive screw (40) drives the two mounting brackets (21) to move closer to each other or further away from each other. A guide rail (41) is disposed on the base (10), and two mounting brackets (21) are movably disposed on the guide rail (41), and the two mounting brackets (21) are respectively located on both sides of the mounting cavity (121). The extension direction of the guide rail (41) is the same as the extension direction of the drive screw (40).

4. The blowout prevention device according to claim 1, characterized in that, The inner wall of the borehole (100) has a mounting groove (101), one end of which extends to the top of the borehole (100), and the base (10) includes: A base plate (11) having the opening, and a clamping part (20) disposed above the base plate (11); A sleeve (12) is disposed below the base plate (11). The cavity inside the sleeve (12) forms the mounting cavity (121). The bottom of the sleeve (12) has the clearance opening (126). The sleeve (12) has a fixing plate (122) on one side of the opening. The sleeve (12) is connected to the base plate (11) through the fixing plate (122). Fasteners (123) are provided on the side wall of the sleeve (12). The fasteners (123) are provided corresponding to the mounting groove (101). The fasteners (123) are used to connect with the mounting groove (101) to fix the sleeve (12) in the drill hole (100). A sealing element (124) is disposed on the outer wall of the sleeve (12) and is located above the fastener (123). The sealing element (124) is used to seal the end of the mounting groove (101) located at the top of the drill hole (100).

5. The blowout prevention device according to claim 4, characterized in that, The base (10) also includes a sealing ring (125), which is sleeved on the fastener (123) and is used to seal the gap between the fastener (123) and the mounting groove (101).

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