Wet type blowout preventer for gas drainage drilling

Abstract

The utility model belongs to the technical field of underground construction, and particularly relates to a wet-type blowout preventer for gas drainage drilling, which comprises a cyclone separator, the cyclone separator is mounted on a support, a star-shaped discharger is mounted at the bottom end of the cyclone separator, the top end of the cyclone separator is communicated with a gas outlet pipe, the other end of the gas outlet pipe is connected with a gas storage tank, and the gas storage tank is connected with a gas pump. The top side of the cyclone separator is communicated with an air inlet pipe, one end of the air inlet pipe is connected with a compressor air outlet, the bottom side of the air inlet pipe is connected with one end of a feeding pipe, the other end of the feeding pipe is connected with the side face of an outer pipe body, the top end of the outer pipe body is provided with a through hole matched with a sealing piece, and the bottom of the outer pipe body is in threaded connection with a lengthening piece. Under the action of the flow velocity difference, coal cinder, gas and liquid beads generated in the drilling process are sucked into the cyclone separator, efficient separation of the coal cinder, the gas and the liquid beads is achieved, and therefore collection and treatment of the gas are effectively achieved; the sealing piece is matched with the lengthening piece, so that effective sealing of the gas drainage hole by the outer pipe body is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of underground construction, and in particular relates to a wet blowout prevention device for gas extraction drilling. Background Art

[0002] During the drilling process at the underground drilling site, first of all, drilling blowout may occur, resulting in abnormal or excessive gas. Coal, rock particles and gas will be ejected from the borehole at high speed, injuring the drilling construction workers. The outburst of a large amount of gas will cause the gas to exceed the limit, and the drilling construction will be unable to continue. Secondly, if the coal powder generated by drilling seriously exceeds the standard, a large amount of dust will be generated when using wind slag removal. 70% of the dust is respirable dust. Coal dust is also explosive, causing fires and creating various harmful gases that threaten the lives of employees and directly endanger the safe production of mines.

[0003] The utility model patent with authorization announcement number CN217632555U discloses a wet blowout prevention device for gas extraction drilling, including a drilling machine installed on a coal wall, the drilling machine is connected to a gas pipe and a slag discharge pipe, a negative pressure gauge is installed on the gas pipe, the output end of the slag discharge pipe is connected to a gas-water-slag separator, an L-shaped baffle is installed at the input end of the gas-water-slag separator, the gas-water-slag separator is provided with a slag discharge port, the output end of the gas-water-slag separator is connected to a return air pipe, the output end of the return air pipe and the input end of the gas pipe are both installed with a gas extraction pipe, a negative pressure device is installed inside the gas extraction pipe; the gas pipe, the slag discharge pipe and the return air pipe are all installed with a filter gate valve.

[0004] However, the above structure is not suitable for vertically opened gas extraction holes. When the above device is used on vertically opened gas extraction holes, gas, coal slag and water cannot be automatically separated through the gas pipe and the slag discharge pipe under the action of gravity. Utility Model Content

[0005] In view of the above problems, the purpose of the utility model is to provide a wet blowout preventer for gas extraction drilling holes, so as to solve the problem that the existing wet blowout preventer for gas extraction drilling holes is not suitable for vertically opened gas extraction holes.

[0006] To achieve the above objectives, the utility model adopts the following technical solution: a wet blowout prevention device for gas extraction drilling, comprising a cyclone separator, the cyclone separator is mounted on a bracket, a star-shaped discharger is mounted at the bottom end of the cyclone separator, the top end of the cyclone separator is connected to an outlet pipe, the other end of the outlet pipe is connected to a gas storage tank, the top side of the cyclone separator is connected to an inlet pipe, one end of the inlet pipe is connected to an outlet port of a compressor, the bottom side of the inlet pipe is connected to one end of a feed pipe, the other end of the feed pipe is connected to the side of an outer tube body, a through hole for fitting a seal is provided at the top end of the outer tube body, and an extension piece is threadedly connected to the bottom of the outer tube body.

[0007] The beneficial effects of the utility model are as follows: under the action of flow rate difference, coal slag, gas and liquid droplets generated during the drilling process are sucked into the cyclone separator, achieving efficient separation of the three, thereby effectively realizing the collection and treatment of gas; the sealing member cooperates with the extension member to ensure the effective sealing of the outer tube body to the gas extraction hole.

[0008] In order to effectively collect the coal slag, gas and liquid droplets discharged from the gas drainage hole;

[0009] As a further improvement of the above technical solution: the axis of the extension piece is perpendicular to the bottom surface of the bracket, and the extension piece is an internally threaded tube structure.

[0010] The beneficial effect of this improvement is that when the extension piece is twisted downward on the outside of the outer tube body, it can be pressed tightly against the ground, playing an effective sealing role, so that the coal slag, gas and liquid droplets discharged from the gas extraction hole can be effectively collected through the outer tube body.

[0011] In order to effectively ensure the sealing between the outer tube body and the drill pipe;

[0012] As a further improvement of the above technical solution: the sealing member is an annular rubber pad structure formed by surrounding a plurality of sealing pads.

[0013] The beneficial effect of this improvement is that the sealing gasket can produce elastic deformation when the drill pipe is inserted into the outer tube body, and adhere to the surface of the drill pipe, thereby preventing coal slag, gas and liquid droplets discharged from the gas extraction hole from leaking through the connection between the outer tube body and the drill pipe.

[0014] In order to allow the coal slag, gas and liquid droplets collected in the outer tube to effectively enter the air intake pipe through the feed pipe;

[0015] As a further improvement of the above technical solution: the top end of the feed pipe is inclined toward the direction of the cyclone separator.

[0016] The beneficial effect of this improvement is that under the effect of the flow rate difference, the coal slag, gas and liquid droplets collected in the outer tube body are effectively sucked into the air intake pipe through the inclined feed pipe.

[0017] In order to avoid structural interference between the drill pipe and the air intake pipe;

[0018] As a further improvement of the above technical solution: the vertical projection of the outer tube body is located outside the vertical projection of the air intake pipe.

[0019] The beneficial effect of this improvement is that the outer tube body and the air inlet pipe are staggered in the vertical direction, which can avoid structural interference between the vertically moving drill rod and the air inlet pipe.

[0020] In order to ensure the stability of the cyclone separator;

[0021] As a further improvement of the above technical solution: the bracket includes a cross frame and a column, the cross frame is composed of four angle irons welded on the side wall of the cyclone separator to form a square frame structure, and the column is a circular tube structure.

[0022] The beneficial effect of this improvement is that the bracket composed of the horizontal frame and the vertical column can provide stable support for the cyclone separator, thereby ensuring the stability of the operation of the cyclone separator.

[0023] The parts not involved in the device are the same as those in the prior art or can be implemented by using the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a cross-sectional structural diagram of the utility model;

[0025] Figure 2 It is a structural schematic diagram of the utility model;

[0026] Figure 3 It is the front view of the utility model;

[0027] Figure 4 It is a top view of the utility model;

[0028] In the figure: 1, cyclone separator; 2, bracket; 21, cross frame; 22, column; 3, air inlet pipe; 4, feed pipe; 5, outer tube body; 6, sealing member; 61, sealing gasket; 7, extension member; 8, air outlet pipe; 9, star-shaped discharger. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory and should not have any limiting effect on the protection scope of the present invention.

[0030] Embodiment 1:

[0031] like Figure 1As shown in FIG. 4 , a wet blowout prevention device for gas extraction drilling comprises a cyclone separator 1, wherein the cyclone separator 1 is mounted on a bracket 2, a star-shaped discharger 9 is mounted at the bottom end of the cyclone separator 1, an air outlet pipe 8 is connected to the top end of the cyclone separator 1, and the other end of the air outlet pipe 8 is connected to a gas storage tank, an air inlet pipe 3 is connected to the top side of the cyclone separator 1, one end of the air inlet pipe 3 is connected to the air outlet of a compressor, the bottom side of the air inlet pipe 3 is connected to one end of a feed pipe 4, and the other end of the feed pipe 4 is connected to the side of an outer tube body 5, and the top end of the outer tube body 5 is opened. A through hole is provided for fitting and installing a sealing member 6. The bottom of the outer tube body 5 is threadedly connected with an extension member 7. Under the effect of the flow rate difference, the coal slag, gas and liquid droplets generated during the drilling process are sucked into the cyclone separator 1, achieving efficient separation of the three, thereby effectively realizing the collection and treatment of the gas; the sealing member 6 cooperates with the extension member 7 to ensure the effective sealing of the gas extraction hole by the outer tube body 5. The axis of the extension member 7 is perpendicular to the bottom surface of the bracket 2. The extension member 7 is an internal threaded tube structure. When the extension member 7 is screwed downward on the outside of the outer tube body 5, it can be pressed tightly against the ground, thereby playing an effective sealing role. , so that the coal slag, gas and liquid droplets discharged from the gas extraction hole can be effectively collected through the outer tube body 5. The sealing member 6 is an annular rubber pad structure formed by surrounding a plurality of sealing pads 61. The sealing pad 61 can produce elastic deformation when the drill rod is inserted into the outer tube body 5, and is tightly attached to the surface of the drill rod to prevent the coal slag, gas and liquid droplets discharged from the gas extraction hole from leaking through the connection between the outer tube body 5 and the drill rod. The top end of the feed pipe 4 is inclined toward the direction of the cyclone separator 1. Under the action of the flow velocity difference, the coal slag, gas and liquid droplets collected in the outer tube body 5 are collected through the inclined feed pipe 4. The air is effectively sucked into the air intake pipe 3, the vertical projection of the outer tube body 5 is located outside the vertical projection of the air intake pipe 3, the outer tube body 5 and the air intake pipe 3 are staggered in the vertical direction, and structural interference between the vertically moving drill rod and the air intake pipe 3 can be avoided. The bracket 2 includes a cross frame 21 and a column 22. The cross frame 21 is composed of four angle irons welded on the side wall of the cyclone separator 1 to form a square frame structure, and the column 22 is a circular tube structure. The bracket 2 composed of the cross frame 21 and the column 22 can provide stable support for the cyclone separator 1 and ensure the stability of the cyclone separator 1 at work.

[0032] The working principle of the present technical solution is as follows: the drill rod passes vertically through the seal 6 into the outer tube body 5, and a hole is drilled on the ground inside the outer tube body 5. The seal 6 is deformed to seal the connection between the drill rod and the outer tube body 5. When there is a height difference between the bottom end of the outer tube body 5 and the ground, the extension piece 7 is rotated to move the extension piece 7 downwards from the outer tube body 5, so that the bottom end of the extension piece 7 is pressed against the ground. The compressor connected to the intake pipe 3 is started, so that high-speed air flows into the cyclone through the intake pipe 3. In the air separator 1, drilling work is then carried out. The gas, coal slag, water, etc. ejected from the coal seam enter the air inlet pipe 3 through the feed pipe 4 under the action of the air flow difference, and enter the interior of the cyclone separator 1 together with the compressed air. Under the action of centrifugal force, the coal slag and liquid droplets are thrown to the bottom of the cyclone separator 1, and the gas and other gases are discharged to the subsequent separation equipment and storage equipment through the outlet pipe 8 for processing; the star-shaped discharger 9 operates intermittently to discharge the coal slag and liquid droplets deposited at the bottom of the cyclone separator 1.

[0033] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0034] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. The above is only a preferred implementation of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. A wet blowout prevention device for gas extraction drilling, characterized in that: The invention comprises a cyclone separator (1), wherein the cyclone separator (1) is mounted on a bracket (2), a star-shaped discharger (9) is mounted at the bottom end of the cyclone separator (1), an air outlet pipe (8) is connected to the top end of the cyclone separator (1), the other end of the air outlet pipe (8) is connected to a gas storage tank, an air inlet pipe (3) is connected to the top side of the cyclone separator (1), one end of the air inlet pipe (3) is connected to the air outlet of a compressor, the bottom side of the air inlet pipe (3) is connected to one end of a feed pipe (4), the other end of the feed pipe (4) is connected to the side of an outer tube body (5), a through hole for fitting a sealing member (6) is provided at the top end of the outer tube body (5), and an extension member (7) is threadedly connected to the bottom of the outer tube body (5).

2. A wet blowout prevention device for gas extraction drilling according to claim 1, characterized in that: The axis of the extension piece (7) is perpendicular to the bottom surface of the bracket (2), and the extension piece (7) is an internally threaded tube structure.

3. A wet blowout prevention device for gas extraction drilling according to claim 1, characterized in that: The sealing member (6) is an annular rubber pad structure formed by surrounding a plurality of sealing pads (61).

4. A wet blowout prevention device for gas extraction drilling according to claim 1, characterized in that: The top end of the feed pipe (4) is arranged to be inclined toward the cyclone separator (1).

5. A wet blowout prevention device for gas extraction drilling according to claim 1, characterized in that: The vertical projection of the outer tube body (5) is located outside the vertical projection of the air intake pipe (3).

6. A wet blowout prevention device for gas extraction drilling according to claim 1, characterized in that: The support (2) comprises a cross frame (21) and a column (22); the cross frame (21) is composed of four angle irons welded to the side wall of the cyclone separator (1) to form a square frame structure; and the column (22) is a circular tube structure.

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