Gas drilling blowout prevention device

Abstract

The present invention provides a gas drilling blowout prevention device, including a drilling rig, a multi-pass orifice unit fixed at the front end of the drilling rig, the drill rod of the drilling rig can freely pass through the multi-pass orifice unit to act on the coal wall, a coal wall sealing capsule fixed at the front end of the multi-pass orifice unit, the multi-pass orifice unit has a slag discharge channel inclined downward, the slag discharge channel has a movable baffle, and the multi-pass orifice unit at the front end of the baffle is connected to a gas separation unit through a pipeline; the drilling rig is provided with a control unit, and when the control unit detects that the gas content exceeds a threshold value, the baffle is automatically closed to block the slag discharge channel, and the power supply of the blowout prevention device is turned off. The advantages of the present invention are: the coal wall sealing capsule is used to block the gap between the multi-pass orifice unit and the coal wall, ensuring that coal slag and gas can only enter the multi-pass orifice unit, and the coal slag in the drilling process is discharged. When gas leakage occurs, the slag discharge channel is closed, so that the gas can only enter the gas separation unit for processing, ensuring the safety of the working environment.

Description

Technical Field

[0001] The present invention relates to the field of gas extraction technology, and in particular to a gas drilling blowout prevention device. Background Art

[0002] During coal mining, gas outburst is a very serious accident. At present, gas is mainly extracted by drilling and extraction to prevent excessive gas pressure. However, during the extraction process, drilling may cause blowouts, thereby affecting the safety of the operation. At present, a blowout prevention device is mainly used to control the orifice. The invention patent application with the publication number CN106223997A discloses a high-gas outburst coal seam drilling and hydraulic cutting blowout prevention and outburst prevention device and method. A sealing capsule is arranged outside the casing, and the sealing capsule and the inner wall of the borehole are sealed by injecting liquid during operation, thereby preventing gas, dust, etc. from being ejected from the borehole. Although the device can meet the needs of daily work, the sealing capsule is in contact with the inner wall of the borehole and may be damaged during use, resulting in leakage when filling with liquid, and the borehole cannot be blocked. There may also be liquid splashing, which may expand the borehole cracks and affect the safety of the operation; and the borehole itself may have cracks during the extraction process. At this time, the pressure of the sealing capsule may expand the cracks, causing gas and dust to be ejected from the cracks, and the purpose of blowout prevention cannot be effectively achieved. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a blowout prevention device which can timely block the borehole in case of an accident to prevent splashing accidents.

[0004] The present invention solves the above-mentioned technical problems through the following technical solutions: a gas drilling blowout prevention device, comprising a drilling rig, a multi-way orifice unit is fixed at the front end of the drilling rig, the drill rod of the drilling rig can freely pass through the multi-way orifice unit to act on the coal wall, a coal wall sealing capsule that can be compressed axially is fixed at the front end of the multi-way orifice unit, the multi-way orifice unit has a slag discharge channel inclined downward, the slag discharge channel has a movably arranged baffle, and the multi-way orifice unit at the front end of the baffle is connected to a gas separation unit through a pipeline; a control unit is arranged on the drilling rig, the control unit includes a gas monitoring sensor, and the gas monitoring sensor is configured to automatically close the baffle to block the slag discharge channel and turn off the power supply of the blowout prevention device when it detects that the gas content exceeds a threshold value.

[0005] The present invention discharges coal slag during the drilling process by arranging an orifice multi-pass unit, and uses a coal wall sealing capsule to seal the gap between the orifice multi-pass unit and the coal wall, ensuring that coal slag and gas can only enter the orifice multi-pass unit. When gas leakage occurs, the control unit controls the baffle to close the slag discharge channel, so that the gas can only enter the coal gas separation unit for processing, ensuring the safety of the working environment, and at the same time shutting down the power supply of the blowout prevention device to prevent electric sparks from igniting the gas and avoid accidents; the blowout prevention device does not directly act on the drill hole, reducing the impact on the drill hole structure and improving safety.

[0006] Preferably, the coal wall sealing capsule is in a bellows structure and is made of a rubber-clamped woven steel mesh material.

[0007] Preferably, one end of the baffle is hinged and fixed to the edge of the slag discharge channel by a torsion spring. In the natural state, the torsion spring drives the baffle to cover the slag discharge channel. A limiting nut is fixed on the side of the baffle facing the direction of incoming coal slag. A limiting hole for the limiting nut to pass through is provided on the side wall of the slag discharge channel. A accommodating block is fixed on the outside of the limiting hole. When the slag discharge channel is opened, the limiting nut is confined in the accommodating block.

[0008] Preferably, a hydraulic telescopic cylinder is connected to the accommodating block, and a power shaft of the hydraulic telescopic cylinder can be inserted into a limiting nut in the accommodating block.

[0009] Preferably, both ends of the power shaft extend beyond the two ends of the hydraulic telescopic cylinder respectively, and the end of the power shaft away from the accommodating block is hingedly matched with the middle position of a pressure rod, and the end of the pressure rod facing the slag discharge channel is hingedly matched with a fixed rod fixed on the outside of the slag discharge channel.

[0010] Preferably, a funnel-shaped slag discharge port is also provided at the end of the slag discharge channel, the slag discharge port is hinged to one side of the slag discharge channel, and the other side is detachably connected to the side wall of the slag discharge channel by a buckle, and a baffle is arranged at the position where the slag discharge channel is connected to the slag discharge port.

[0011] Preferably, the gas monitoring sensor is arranged on the side of the orifice multi-pass unit facing away from the coal wall, and the control unit also includes a power-on controller and an electric water valve which are communicatively connected to the gas monitoring sensor. When the monitoring value of the gas monitoring sensor exceeds a threshold value, the power-on controller is powered off, and the electric water valve supplies water to the hydraulic telescopic cylinder to drive the power shaft to leave the limit nut axially.

[0012] Preferably, a drill rod sealing unit for the drill rod to pass through is coaxially arranged on the side of the orifice multi-channel unit facing away from the coal wall. The inner cavity of the drill rod sealing unit is provided with an annular bag. The drill rod can pass through the annular bag to drill holes. After the electric water valve is opened, the annular bag can be filled with water to block the circumferential space of the drill rod.

[0013] Preferably, a supporting bracket supporting the orifice multi-pass unit is provided at the front end of the drilling rig, and the supporting bracket includes a vertical plate fixed on the drilling rig, and a multi-stage cylinder is hingedly provided on both sides of the vertical plate, and a support rod is hingedly fixed on the outer tube of the multi-stage cylinder, and the other end of the support rod is hinged on the vertical plate and is located below the fixed position of the multi-stage cylinder; ear plates are fixedly provided on both sides of the orifice multi-pass unit, and the telescopic ends of the multi-stage cylinder are fixedly connected to the ear plates.

[0014] Preferably, the gas separation unit includes a tank body, which is provided with a dustproof net that divides the tank body in a vertical direction, and the tank body is provided with an inlet extending below the dustproof net and an outlet above the dustproof net, wherein the outlet is connected to a negative pressure system, and a movable door that can be movably opened is provided at the lower part of the tank body.

[0015] The advantages of the gas drilling blowout prevention device provided by the present invention are: by setting an orifice multi-channel unit, coal slag in the drilling process is discharged, and at the same time, the gap between the orifice multi-channel unit and the coal wall is blocked by a coal wall sealing capsule to ensure that coal slag and gas can only enter the orifice multi-channel unit; when gas leakage occurs, the control unit controls the baffle to close the slag discharge channel, so that the gas can only enter the coal gas separation unit for processing, ensuring the safety of the working environment, and at the same time shutting down the power supply of the blowout prevention device to prevent electric sparks from igniting the gas and avoid accidents; the blowout prevention device does not directly act on the drilling hole, reducing the impact on the drilling structure and improving safety. The automatic closing of the baffle is achieved through the cooperation of the hydraulic telescopic cylinder and the limit nut, which is easy to control, and the drill rod and the slag discharge channel are closed simultaneously based on high-pressure water to prevent gas leakage; the pressure rod is set to drive the power shaft to move, so that the baffle can be opened manually conveniently, and the orifice multi-channel unit is fixedly connected to the drilling rig by setting a supporting bracket, and the distance between the orifice multi-channel unit and the coal wall can be conveniently adjusted to ensure the sealing effect of the coal wall sealing capsule; a dustproof net is set in the gas separation unit to filter the gas, so that most of the coal slag remains in the tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a gas drilling blowout prevention device provided by an embodiment of the present invention;

[0017] Figure 2 A schematic diagram of a coal wall sealing capsule of a gas drilling blowout prevention device provided by an embodiment of the present invention;

[0018] Figure 3 A schematic diagram of a slag discharge channel of a gas drilling blowout prevention device provided by an embodiment of the present invention;

[0019] Figure 4 A schematic diagram of an orifice multi-pass unit of a gas drilling blowout prevention device provided by an embodiment of the present invention;

[0020] Figure 5 A schematic diagram of a hydraulic telescopic cylinder of a gas drilling blowout prevention device provided by an embodiment of the present invention;

[0021] Figure 6 A schematic diagram of a drill pipe sealing unit of a gas drilling blowout prevention device provided by an embodiment of the present invention;

[0022] Figure 7 A schematic diagram of a gas separation unit of a gas drilling blowout prevention device provided by an embodiment of the present invention;

[0023] Figure 8 A cross-sectional view of a gas separation unit of a gas drilling blowout prevention device provided by an embodiment of the present invention;

[0024] Fig. 9 A schematic diagram of a support bracket for a gas drilling blowout prevention device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the technical solution of the present invention is clearly and completely described below in combination with specific embodiments and with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] like Figure 1 As shown, this embodiment provides a gas drilling blowout prevention device, including a drilling rig 2, a multi-hole unit 3 is fixed at the front end of the drilling rig 2, a drill rod 21 of the drilling rig 2 can freely pass through the multi-hole unit 3 to act on the coal wall 1, and a coal wall sealing capsule 4 that can be compressed in the axial direction is fixed at the front end of the multi-hole unit 3; Figure 3 The orifice multi-channel unit 3 has a slag discharge channel 31 inclined downward, and the slag discharge channel 31 has a movably arranged baffle 32. The orifice multi-channel unit 3 between the baffle 32 and the coal wall sealing capsule 4 is also connected to a gas separation unit 6 through a pipeline. The drilling rig 2 is also provided with a control unit 5, and the control unit 5 includes a gas monitoring sensor 51. The gas monitoring sensor 51 is configured to automatically close the baffle 32 to block the slag discharge channel 31 and turn off the power supply of the blowout prevention device when the detected gas content exceeds a threshold value.

[0027] In this embodiment, the coal slag generated during the drilling process is discharged by setting up the orifice multi-channel unit 3, and the coal wall sealing capsule 4 is used to block the gap between the orifice multi-channel unit 3 and the coal wall, ensuring that the coal slag and gas can only enter the orifice multi-channel unit 3. When gas leakage occurs, the control unit 5 controls the baffle 32 to close the slag discharge channel 31, so that the gas can only enter the coal gas separation unit 6 for processing, ensuring the safety of the working environment, and at the same time turning off the power supply of the blowout prevention device to prevent electric sparks from igniting the gas and avoid accidents; the blowout prevention device does not directly act on the borehole, reducing the impact on the borehole structure and improving safety.

[0028] refer to Figure 4 The orifice multi-channel unit 3 includes a main body 37 arranged between the drilling rig 2 and the coal wall 1, and the slag discharge channel 31 is arranged on the main body 37. In order to prevent the coal slag from directly leaving the orifice multi-channel unit 3 along the main body 37, a coal slag blocking plate 371 is also arranged in the main body 37 in this embodiment. The surface of the coal slag blocking plate 371 is provided with a through hole 372 with a diameter slightly larger than the diameter of the drill rod 21, so that the gap between the drill rod 21 and the coal slag blocking plate 371 is small, preventing the coal slag from passing through; the entrance of the slag discharge channel 31 is arranged on the main body 37 between the coal slag blocking plate 371 and the coal wall 1, so that most of the coal slag can naturally fall into the slag discharge channel 31, and enter the subsequent processing equipment through the guidance of the slag discharge channel 31, or be directly discharged into the tunnel.

[0029] A drill rod sealing unit 7 for the drill rod 21 to pass through is coaxially fixed on the side of the orifice multi-pass unit 3 facing away from the coal wall 1. During normal operation, the drill rod sealing unit 7 does not contact the drill rod 21. When the gas content exceeds the standard, the control unit 5 can control the drill rod sealing unit 7 to seal the circumferential space of the drill rod 21 to prevent gas from entering the working space along the axial direction of the drill rod 21.

[0030] refer to Figure 2 The coal wall sealing capsule 4 is in a corrugated tube structure and is made of a rubber-clamped woven wire mesh material, so it has a certain shrinkage and can be tightly pressed between the orifice multi-pass unit 3 and the coal wall 1. It is not easy to be damaged by friction with coal slag during drilling. The edge of the coal wall sealing capsule 4 facing one end of the orifice multi-pass unit 3 is fixedly connected to the front end of the orifice multi-pass unit 3 by bolts. When in use, a sealing gasket can be added as needed to improve the sealing effect.

[0031] Combination Figure 3One end of the baffle 32 is hinged and fixed to the edge of the slag discharge channel 31 by a torsion spring 321. In the natural state, the torsion spring 321 drives the baffle 32 to cover the slag discharge channel 31. When the baffle 32 is closed, a limiting nut 322 is fixed on the side facing the direction of the coal slag material. A limiting hole (not shown) allowing the limiting nut 322 to pass through is provided on the side wall of the slag discharge channel 31. A accommodating block 33 fixedly connected to the slag discharge channel 31 is fixed on the outside of the limiting hole. When the slag discharge channel 31 is fully opened, the limiting nut 322 is restricted in the accommodating block 33, thereby ensuring that the slag discharge channel 31 remains unobstructed during normal slag discharge.

[0032] Combination Figure 4 and Figure 5 The accommodation block 33 is connected to a hydraulic telescopic cylinder 34 , and a power shaft 341 of the hydraulic telescopic cylinder 34 can penetrate into a limiting nut 322 in the accommodation block 33 , thereby limiting the movement of the baffle 32 .

[0033] Recombination Figure 1 The gas monitoring sensor 51 acts on the entrance of the slag discharge channel 31, so that abnormal gas discharge can be monitored in time. The control unit 5 also includes a power-on controller (not shown) and an electric water valve (not shown) that are communicatively connected to the gas monitoring sensor 51. When the detection value of the gas detection sensor 51 exceeds the threshold, the electric water valve opens to provide high-pressure water to the hydraulic telescopic cylinder 34, thereby driving the power shaft 341 to axially leave the limit nut 322, and the baffle 32 moves under the action of the torsion spring to block the slag discharge channel 31.

[0034] refer to Figure 6 The inner cavity of the drill pipe sealing unit 7 is provided with an annular bag 71, through which the drill pipe 21 can pass to drill a hole, and the annular bag 71 is provided with a water inlet 72 connected to the electric water valve. After the electric water valve is opened, the annular bag 71 can be filled with water to expand, thereby blocking the circumferential space of the drill pipe 21. High-pressure water provides power, and the space between the slag discharge channel 31 and the drill pipe 21 is blocked at the same time, so that the gas can only enter the coal gas separation unit 6 for processing, thereby ensuring the safety of the operation.

[0035] Combination Figure 4 and Figure 5The end of the slag discharge channel 31 is also provided with a funnel-shaped slag discharge port 311, which is hinged to one side of the slag discharge channel 31, and the other side is detachably connected to the side wall of the slag discharge channel through a buckle 312. The baffle 32 is arranged at the position where the slag discharge channel 31 is connected to the slag discharge port 311. After the baffle 32 closes the slag discharge channel 31, if it is necessary to reopen the baffle 32, the buckle 312 on the slag discharge port 311 can be opened, and the baffle 32 can be directly pushed down manually to make the limiting nut 322 in the accommodating block 33, and then the power shaft 341 of the hydraulic telescopic cylinder 34 is inserted into the limiting nut 322, so as to complete the locking of the baffle 32, and then the slag discharge port 311 can be re-fixed to carry out the slag discharge work.

[0036] Both ends of the power shaft 341 extend beyond the two ends of the hydraulic telescopic cylinder 34. The end of the power shaft 341 away from the accommodating block 33 is hingedly cooperated with the middle position of a pressure rod 342. The pressure rod 342 is hingedly cooperated with a fixing rod 343 on the side facing the slag discharge channel 31. The fixing rod 343 is fixed on the side wall of the slag discharge channel 31. The power shaft 341 can be inserted into the limit nut 322 by pressing down the pressure rod 342 to complete the locking of the baffle 32.

[0037] refer to Figure 7 The coal gas separation unit 6 includes a tank body 61, and a dustproof net (not shown) is provided inside the tank body 61 to divide the tank body 61 in the vertical direction. The tank body 61 is provided with an inlet 62 extending below the dustproof net and an outlet 63 located above the dustproof net. The inlet 62 is connected to the orifice multi-pass unit 3, and the outlet 63 is connected to the negative pressure system to prevent gas leakage; the lower part of the tank body 61 is provided with an openable movable door 64 to facilitate the cleaning of coal slag; a rubber ring (not shown) is provided at the connection between the movable door 64 and the tank body 61 for sealing to prevent gas leakage. The dustproof net will prevent coal slag from entering the negative pressure system, and the gas will be preliminarily filtered to prevent the coal slag from damaging the processing equipment. Combined with Figure 4 The orifice multi-pass unit 3 is provided with two gas outlets 35 , and the tank body 61 is correspondingly provided with two inlets 62 .

[0038] refer to Figure 7 One side of the movable door 64 is hinged and fixed to the tank body 61, and the other side is detachably fixed to the tank body 61 through a buckle 641. The locking buckle 641 ensures the sealing effect. The movable door 64 has a handle 642 to facilitate the switch operation.

[0039] The bottom of the tank body 61 is evenly provided with a plurality of legs 66 along the circumferential direction, so as to facilitate placing the gas separation device directly in a tunnel with uneven ground. To improve stability, the lower ends of the legs are radially inclined outward to expand the supporting area.

[0040] refer to Figure 8 In the preferred embodiment, a small amount of clean water is also stored at the bottom of the tank body 61, so as to prevent coal slag from directly hitting the tank body 61 during feeding, thereby protecting the tank body 61. The water storage height is lower than the lower frame height of the movable door 64, so as to prevent water from soaking the rubber ring and affecting its service life.

[0041] As the drilling work proceeds, the distance between the orifice multi-pass unit 3 and the coal wall 1 may increase, resulting in the coal wall sealing capsule 4 being unable to effectively seal, and the drilling rig 2 is not convenient to move after being fixed. In this embodiment, a support bracket 8 is fixedly provided at the end of the drilling rig 2, and the support bracket 8 is fixed to the orifice multi-pass unit 3 and drives the orifice multi-pass unit 3 to move axially to change the distance between the orifice multi-pass unit 3 and the coal wall 1. Specifically, refer to Fig. 9 The support bracket 8 includes a vertical plate 81 fixed to the end of the drilling rig 2, a multi-stage oil cylinder 82 perpendicular to the vertical plate 81, and a support rod 83 hingedly matched with the outer cavity of the multi-stage oil cylinder 82. The other end of the support rod 83 is hinged on the vertical plate 81 and is located below the fixed position of the multi-stage oil cylinder 82; Figure 4 , two ear plates 36 are fixedly provided on both sides of the orifice multi-pass unit 3, and a multi-stage oil cylinder 82 and a strut 83 supporting the multi-stage oil cylinder 82 are respectively provided on both sides of the vertical plate 81. The end of the multi-stage oil cylinder 82 facing the coal wall 1 is fixedly matched with the ear plate 36. Through the expansion and contraction of the multi-stage oil cylinder 82, the orifice multi-pass unit 3 is driven to expand and contract along the axial direction, thereby adjusting the distance between the orifice multi-pass unit 3 and the coal wall 1 to ensure the sealing effect of the coal wall sealing capsule 4. The upper part of the vertical plate 81 has a semicircular notch 84, and the drill rod passes through the notch 84 to cooperate with the orifice multi-pass unit 3. The fixed end of the multi-stage oil cylinder 82 is hinged and fixed to the vertical plate 81. The length of the strut 83 is adjustable, so that the length of the strut 83 can be adjusted to fine-tune the position of the orifice multi-pass unit 3, ensuring that the drill rod 21 will not interfere with the structure of the orifice multi-pass unit 3.

[0042] During normal drilling operations, waste materials such as coal slag generated by drilling the drill rod 21 enter the orifice multi-channel unit 3 along the slag discharge head 31 and leave the orifice multi-channel unit 3, which is convenient for collecting or cleaning the coal slag; the compressed coal wall sealing capsule 4 prevents the coal slag from leaking at the drilling site, and the coal slag blocking plate 371 prevents the coal slag from leaving the main body 37 along the axial direction of the drill rod 21, but the coal slag blocking plate 371 cannot strictly seal. When a gas leak occurs, the control unit 5 cuts off the system power supply to stop the drill rod 21, and at the same time controls the electric water valve to open, and the high-pressure water drives the lower hydraulic telescopic cylinder 34 to release the baffle 32, thereby blocking the slag discharge channel. The high-pressure water can also be filled into the annular bag 71, causing the annular bag 71 to expand and block the circumferential space of the drill rod 21, thereby blocking the channel of the main body 37, so that the gas can only enter the coal gas separation unit 6, thereby improving operation safety. When the drilling distance is large, the support bracket 8 can be used to push the orifice multi-pass unit 3 to move axially along the drill rod 21 to ensure that the coal wall sealing capsule 4 is always pressed against the coal wall to reliably seal the coal wall.

[0043] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A gas drilling blowout prevention device, characterized in that: The invention comprises a drilling rig, wherein a multi-pass orifice unit is fixed at the front end of the drilling rig, the drill rod of the drilling rig can freely pass through the multi-pass orifice unit to act on the coal wall, a coal wall sealing capsule that can be compressed in the axial direction is fixed at the front end of the multi-pass orifice unit, the multi-pass orifice unit has a slag discharge channel inclined downward, the slag discharge channel has a movably arranged baffle, and a coal gas separation unit is connected to the multi-pass orifice unit at the front end of the baffle through a pipeline; a control unit is arranged on the drilling rig, the control unit includes a gas monitoring sensor, and the gas monitoring sensor is configured to automatically close the baffle to block the slag discharge channel and turn off the power supply of the blowout prevention device when detecting that the gas content exceeds a threshold value; One end of the baffle is hinged and fixed to the edge of the slag discharge channel by a torsion spring. In the natural state, the torsion spring drives the baffle to cover the slag discharge channel. A limiting nut is fixed on the side of the baffle facing the direction of the coal slag material. A limiting hole for the limiting nut to pass through is provided on the side wall of the slag discharge channel. A containing block is fixed on the outside of the limiting hole. When the slag discharge channel is opened, the limiting nut is confined in the containing block. The accommodation block is connected to a hydraulic telescopic cylinder, and a power shaft of the hydraulic telescopic cylinder can be inserted into a limiting nut in the accommodation block; The gas monitoring sensor is arranged on the side of the orifice multi-pass unit facing away from the coal wall. The control unit also includes a power controller and an electric water valve which are communicatively connected to the gas monitoring sensor. When the monitoring value of the gas monitoring sensor exceeds a threshold value, the power controller is powered off, and the electric water valve supplies water to the hydraulic telescopic cylinder to drive the power shaft to leave the limit nut axially.

2. A gas drilling blowout prevention device according to claim 1, characterized in that: The coal wall sealing capsule is in a bellows structure and is made of a rubber clamp woven steel wire mesh material.

3. A gas drilling blowout prevention device according to claim 1, characterized in that: The two ends of the power shaft extend beyond the two ends of the hydraulic telescopic cylinder respectively, and the end of the power shaft away from the accommodating block is hingedly matched with the middle position of a pressure rod, and the end of the pressure rod facing the slag discharge channel is hingedly matched with a fixed rod fixed on the outside of the slag discharge channel.

4. A gas drilling blowout prevention device according to claim 3, characterized in that: A funnel-shaped slag discharge port is also provided at the end of the slag discharge channel. The slag discharge port is hinged to one side of the slag discharge channel, and the other side is detachably connected to the side wall of the slag discharge channel through a buckle. The baffle is provided at the position where the slag discharge channel is connected to the slag discharge port.

5. A gas drilling blowout prevention device according to claim 4, characterized in that: A drill rod sealing unit for the drill rod to pass through is coaxially arranged on the side of the orifice multi-channel unit facing away from the coal wall. The inner cavity of the drill rod sealing unit is provided with an annular bag. The drill rod can pass through the annular bag to drill a hole. After the electric water valve is opened, the annular bag can be filled with water to block the circumferential space of the drill rod.

6. A gas drilling blowout prevention device according to claim 1, characterized in that: A supporting bracket for supporting the orifice multi-pass unit is arranged at the front end of the drilling rig, and the supporting bracket includes a vertical plate fixed on the drilling rig, and multi-stage cylinders are hingedly arranged on both sides of the vertical plate, and a support rod is hingedly fixed on the outer tube of the multi-stage cylinder, and the other end of the support rod is hinged on the vertical plate and is located below the fixed position of the multi-stage cylinder; ear plates are fixedly arranged on both sides of the orifice multi-pass unit, and the telescopic ends of the multi-stage cylinder are fixedly connected to the ear plates.

7. A gas drilling blowout prevention device according to claim 1, characterized in that: The gas separation unit includes a tank body, a dustproof net is arranged inside the tank body to separate the tank body in the vertical direction, an inlet extending below the dustproof net and an outlet above the dustproof net are arranged on the tank body, the outlet is connected to the negative pressure system, and a movable door that can be movably opened is arranged at the lower part of the tank body.

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