Orifice blowout prevention and spray hole remote rapid processing device for underground directional gas extraction drill hole

Abstract

The utility model aims to provide an underground directional gas extraction drill hole orifice blowout prevention and spray hole remote rapid processing device, which belongs to the technical field of coal mine gas extraction and comprises a flange type blowout prevention five-way joint, the axial front end of the flange type blowout prevention five-way joint close to a coal wall side port is connected with a hole sealing pipe of a drill hole in a coal wall, and the end of the flange type blowout prevention five-way joint is connected with a hole sealing pipe of the drill hole in the coal wall. The axial rear end is connected with a plug-in type quick-opening blowout prevention sealing leather cushion straight-through part through a flange, the front end, close to a coal wall side port, of the axial upper side is connected with a bag type pneumatic remote control quick gas extraction device through a flange, and a second port of the axial upper side is connected with a temporary extraction pipe orifice used for extracting while beating through a flange; an axial lower side port is connected with a disassembly-free anti-blocking water slag discharge transparent elbow through a flange; the straight-through end of the plug-in type quick-opening blowout prevention sealing leather cushion is connected with a negative pressure gas collecting box through a flange. Three sets of extraction systems are designed in total, the extraction capacity of the device is higher, and the problem that gas is sprayed out under the conditions that a spraying hole and a sealing device are abraded and fail can be effectively solved in time.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal mine gas drainage, and particularly relates to an underground directional gas drainage borehole orifice anti-blowout and blowhole remote rapid treatment device. Background Technique

[0002] During the construction of underground directional gas drainage boreholes in high-gas and outburst mines, phenomena such as the ejection of gas and pulverized coal in the borehole, namely "blowholes", often occur. This situation can cause a large amount of coal and gas to be ejected instantaneously, possibly causing injuries to personnel, and at the same time causing an abnormal increase in the gas concentration in the air current at the drilling site, triggering safety accidents such as the overlimit of methane sensors and power-off.

[0003] Traditional orifice anti-blowout devices have many limitations in practical applications. For example, the "drilling and drainage" system has limited drainage capacity and cannot completely absorb the large amount of high-concentration gas gushing out instantaneously during blowholes. The large amount of ejected coal is extremely easy to block the drainage pipe orifice and the drainage and slag discharge orifice. The sealing device at the end of the drill pipe extending into the anti-blowout device at the rear side is easy to wear and the sealing is not tight. In addition, when a blowhole occurs, personnel cannot approach the orifice for treatment, and it takes a long time for personnel to remotely adjust the control valve of the drainage pipeline, etc. All these problems make the existing anti-blowout devices ineffective in dealing with blowhole accidents and increase the risk of gas accidents. Content of the Utility Model

[0004] Aiming at a series of problems of the existing anti-blowout device, such as the loose sealing at the end of the drill pipe extending into the device, insufficient gas drainage capacity of the orifice device during blowholes, easy blockage of the multi-way gas drainage orifice and the drainage and slag discharge orifice at the orifice by pulverized coal, inability of personnel to approach the orifice for treatment, and long time-consuming for manual operation of the drainage pipe valve, etc., the utility model provides an underground directional gas drainage borehole orifice anti-blowout and blowhole remote rapid treatment device to reduce the construction safety risk and improve the construction efficiency.

[0005] The utility model adopts the following technical scheme:

[0006] An underground directional gas drainage borehole orifice anti-blowout and blowhole remote rapid treatment device includes a flange-type anti-blowout five-way. The front end of the axial direction of the flange-type anti-blowout five-way is connected with a sealing pipe of the borehole on the coal wall through a flange at the port close to the coal wall side. The rear end of the axial direction of the flange-type anti-blowout five-way is connected with an insertion-type quick-opening anti-blowout sealing gasket straight-through through a flange. The front end of the upper side of the axial direction of the flange-type anti-blowout five-way is connected with a bladder-type pneumatic remote control rapid gas drainage device through a flange at the port close to the coal wall side. The second port on the upper side of the axial direction of the flange-type anti-blowout five-way is connected with a temporary drainage pipe orifice for drilling and drainage through a flange. The lower side port of the axial direction of the flange-type anti-blowout five-way is connected with a non-disassembly anti-blocking water and slag discharge transparent elbow through a flange;

[0007] One end of the insertion-type quick-opening anti-blowout sealing gasket straight-through is connected with a negative pressure gas collection box through a flange.

[0008] Furthermore, the plug-in quick-opening blowout preventer sealing gasket straight-through is a stepped U-shaped structure. The diameters of both ends of the plug-in quick-opening blowout preventer sealing gasket straight-through are the same as the axial pipe diameters of the flange-type blowout preventer five-way. The middle part is a U-shaped groove, and the pipe diameter of the U-shaped groove is larger than the pipe diameters of both ends of the plug-in quick-opening blowout preventer sealing gasket straight-through. A flip-type sealing gasket cover plate is provided on the upper part of the plug-in quick-opening blowout preventer sealing gasket straight-through, and a number of sealing gaskets are arranged side by side in the U-shaped groove.

[0009] Furthermore, the sealing gasket is made of circular ring-shaped flame-retardant and antistatic material. The inner ring diameter is the same as the drill pipe diameter, and the outer ring diameter is between the axial pipe diameter of the flange-type blowout preventer five-way and the pipe diameter of the U-shaped groove.

[0010] Furthermore, the bladder-type pneumatic remote-controlled rapid gas drainage device includes a tee. The lower side port in the vertical direction of the tee is connected to the flange-type blowout preventer five-way. The upper side port of the tee is connected with a hanging flexible bladder through a flange. The top of the hanging flexible bladder is connected to the roadway roof through the hanging ring of the flange cover plate. The horizontal port of the tee is connected to the gas drainage pipe orifice through a pneumatic butterfly valve. The pneumatic butterfly valve is connected with a manual air control valve through a high-pressure hose. The manual air control valve is located at the driller's operation platform far from the orifice.

[0011] Furthermore, the temporary drainage pipe orifice is connected to the gas drainage pipeline in the roadway.

[0012] Furthermore, the non-disassembly anti-blocking water slag discharge transparent elbow includes an anti-blocking transparent elbow with a flange. One end of the anti-blocking transparent elbow is connected to the flange-type blowout preventer five-way, and the other end is connected to the drill site water slag separation device and the drainage system.

[0013] Furthermore, the bending radian of the anti-blocking transparent elbow is 45°. An external thread straight-through is provided in the middle of the anti-blocking transparent elbow towards the bottom direction, and a threaded cap is provided on the external thread straight-through.

[0014] Furthermore, the negative pressure gas collection box is a cuboid hollow structure. One end is connected to the plug-in quick-opening blowout preventer sealing gasket straight-through, and the other end is provided with a drill pipe insertion port. The top of the negative pressure gas collection box is connected to the gas drainage pipe orifice through a straight-through.

[0015] The beneficial effects of the present utility model are as follows:

[0016] Compared with the traditional blowout preventer device having a set of temporary drainage system for "drilling while draining", the present utility model designs a total of 3 sets of drainage systems. The drainage capacity of the device is stronger, and it can timely and effectively solve the gas ejection in case of situations such as blowholes and wear and failure of the sealing device.

[0017] Among them, the temporary drainage pipe orifice for drilling while draining is used for temporary drainage of the orifice gas during normal construction of the drill hole;

[0018] The bag-type pneumatic remote control rapid gas drainage device is used for draining a large amount of gas instantaneously ejected during borehole spraying.

[0019] The negative pressure gas collection box is used for collecting and draining the high-concentration gas that directly escapes through the plug-in quick-opening anti-spray sealing leather gasket from the rear end of the flange-type anti-spray five-way connection.

[0020] Compared with the manual control valves such as ball valves and butterfly valves used in the "drilling while draining" gas drainage system of traditional anti-spray devices, when borehole spraying occurs, compared with the rising trend of the ambient gas concentration, it takes an extremely long time for the operator to discover the borehole spraying, find the control valve, and manually operate the valve. It is very easy to miss the best opportunity to handle the borehole spraying, resulting in a continuous increase in the gas concentration and quantity in the ambient air current. In this application, the bag-type pneumatic remote control rapid gas drainage device uses the underground compressed air as the power source. Through the pneumatic butterfly valve and the manual control valve installed at the operator's platform of the drilling rig, the drilling rig driver can press the manual control valve at the first time when discovering the borehole spraying, and start the second set of high-negative-pressure and large-flow orifice gas drainage system to realize the rapid long-distance response to drain a large amount of gas instantaneously ejected during borehole spraying.

[0021] Different from the traditional anti-spray device, when the sealing device of this application is worn, there is no need to disassemble the device for treatment. By opening the sealing leather gasket cover plate of the plug-in quick-opening anti-spray sealing leather gasket straight-through, the sealing leather gasket can be quickly replaced, and the operation is more convenient.

[0022] Different from the 90° iron elbow used for drainage at the lower side of the traditional anti-spray device, the non-disassembling anti-blocking water slag discharge transparent elbow of this application uses a 45° large arc design to effectively reduce the probability of water slag blockage; the high-strength transparent PVC material used can directly observe the blockage situation of the elbow; the external thread straight-through at the bottom of the pipe designed at the lower part of the elbow can directly dredge the elbow without disassembly in the case of large amount of coal slag blocking the elbow in borehole spraying and other holes. Brief Description of the Drawings

[0023] Figure 1 It is a schematic diagram of the exploded main structure of the present utility model;

[0024] Figure 2 It is a schematic front view structure diagram of the present utility model;

[0025] Figure 3 It is a schematic side view structure diagram of the present utility model;

[0026] Figure 4 It is a schematic top view structure diagram of the present utility model;

[0027] Figure 5 It is a schematic three-dimensional structure diagram of the present utility model;

[0028] Wherein: 1 - flange type blowout preventer five - way; 2 - temporary drainage pipe orifice; 3 - negative - pressure gas collection box; 4 - sealing gasket cover plate; 5 - sealing gasket; 6 - three - way; 7 - hanging flexible bladder; 8 - pneumatic butterfly valve; 9 - gas drainage pipe orifice; 10 - high - pressure hose; 11 - manual pneumatic control valve; 12 - anti - block transparent elbow; 13 - external thread straight - through; 14 - threaded cap; 15 - drill pipe. Detailed implementation mode

[0029] In combination with the attached drawings, the present utility model will be further described.

[0030] As shown in the figure, an underground directional gas drainage borehole orifice blowout prevention and outburst remote rapid treatment device includes: a flange type blowout preventer five - way 1, a bladder - type pneumatic remote - control rapid gas drainage device, a "drill - while - draining" temporary drainage pipe orifice 2, an insert - type quick - opening blowout - proof sealing gasket straight - through, a non - disassembly anti - block water - slag discharge transparent elbow, and a negative - pressure gas collection box 3. The flange type blowout preventer five - way 1 is the main structure. The port of the flange type blowout preventer five - way 1 axially close to the coal wall side is connected and fixed to the sealing pipe of the borehole on the coal wall through a flange to form an integral body. The rear end of the flange type blowout preventer five - way 1 in the axial direction is the drill - pipe insertion end, which is connected to the insert - type quick - opening blowout - proof sealing gasket straight - through through a flange. The rear end of the insert - type quick - opening blowout - proof sealing gasket straight - through is connected to the negative - pressure gas collection box 3 through a flange. Two flange - ports are provided on the upper side of the flange type blowout preventer five - way 1 in the vertical direction. The first port close to the coal wall is connected to the bladder - type pneumatic remote - control rapid gas drainage device, and the second port is connected to the gas drainage pipeline in the roadway through the "drill - while - draining" temporary drainage pipe orifice 2 to form a temporary drainage system at the borehole construction orifice. One flange - port is provided on the lower side of the flange type blowout preventer five - way 1 in the vertical direction and is connected to the non - disassembly anti - block water - slag discharge transparent elbow. The end of this device is connected to the drill - site water - slag separation device through a flange, and the sewage is finally discharged into the drainage pipeline in the roadway.

[0031] The bladder - type pneumatic remote - control rapid gas drainage device is connected to the large - capacity hanging flexible bladder 7 through the upper port of the three - way 6. The hanging flexible bladder 7 is fixed to the roadway roof through the hanging ring of the top flange cover plate, and is used for buffering the gas pressure during outbursts, temporarily storing the ejected gas and coal dust. After the pneumatic butterfly valve 8 is installed at the horizontal port of the three - way 6, it is directly connected to the gas drainage pipe orifice 9 to form the second gas drainage system of the present utility model. This drainage system has a high drainage negative - pressure and large flow rate. The pneumatic butterfly valve 8 is usually in a closed state and is connected to the manual pneumatic control valve 11 through the high - pressure hose 10. The manual pneumatic control valve 11 is placed at the operation platform of the drill operator far from the orifice and is connected to the compressed - air pipeline in the roadway through the high - pressure hose 10 to form a passage. This device is mainly used when the drainage capacity of the "drill - while - draining" temporary drainage pipe orifice 2 cannot meet the requirements during outbursts. The drill operator can operate the manual pneumatic control valve 11 at the operation console to remotely and quickly open the pneumatic butterfly valve 8 and quickly and safely drain the ejected high - concentration gas.

[0032] The plug-in quick-opening blowout-preventing sealing leather gasket straight-through adopts a stepped U-shaped design. The diameters at both ends of the plug-in quick-opening blowout-preventing sealing leather gasket straight-through are the same as the axial pipe diameter of the flange-type blowout-preventing five-way pipe 1. The pipe diameter of the middle U-shaped groove is slightly larger than that of both ends. A flip-type sealing leather gasket cover plate 4 is designed on the upper part, which is convenient for replacing the leather gasket. Multiple sealing leather gaskets 5 are inserted side by side in the U-shaped groove of the device, which is mainly used to ensure the sealing of the device without water leakage and air leakage after the drill pipe extends in. The sealing leather gasket 5 is made of circular ring flame-retardant and antistatic material. The inner ring diameter is the same as the diameter of the drill pipe 15, and the outer ring diameter is between the diameter of the flange-type blowout-preventing 1 and the pipe diameter of the middle U-shaped groove of the plug-in quick-opening blowout-preventing sealing leather gasket straight-through. The purpose of this design is that after the drill pipe is inserted into the sealing leather gasket, the sealing leather gasket can closely adhere to the outer wall of the drill pipe to ensure the overall tightness of the device. When the drill pipe rotates, it drives the leather gasket to rotate together in the U-shaped groove of the sealing straight-through, reducing the wear of the contact surface between the leather gasket and the drill pipe.

[0033] The non-disassembling anti-blocking water slag discharge transparent elbow includes an anti-blocking transparent elbow 12 with a flange. The upper end of the anti-blocking transparent elbow 12 is connected to the flange-type blowout-preventing five-way pipe 1, and the lower part is connected to the drill site water slag separation device and the drainage system. The anti-blocking transparent elbow 12 adopts a 45° large arc design, which can effectively prevent the water slag discharged from the orifice from blocking at the elbow. In addition, a pipe bottom external thread straight-through 13 and a threaded cap 14 are designed in the middle of the anti-blocking transparent elbow 12 facing the bottom plate. It is mainly used for quickly dredging when the amount of coal spraying is too large to block the elbow during a blowout by opening the threaded cap 14.

[0034] The negative pressure gas collection box 3 is located at the rearmost end of the whole device and is the third set of gas drainage system of this application. The device adopts a cuboid hollow design. A straight-through is designed at the front end and is connected to the plug-in quick-opening blowout-preventing sealing leather gasket straight-through. A drill tool insertion port is provided at the center position of the rear end. The internal hollow space is used to collect the high-concentration gas escaping from the plug-in quick-opening blowout-preventing sealing leather gasket straight-through during the wear of the sealing leather gasket and blowout during the drilling construction process. A straight-through is designed at the upper part of the box body and is connected to the gas drainage pipe orifice 9 and then connected to the roadway gas drainage pipeline for draining the gas collected inside the box body.

[0035] During the use of the utility model, when a blowout occurs during drilling and the temporary drainage pipe orifice 2 of "drilling while draining" cannot meet the gas drainage requirement at the orifice, the hanging flexible bag 7 will significantly expand and bulge. The drill operator immediately adjusts the manual pneumatic control valve 11 on the operating platform, and the bag-type pneumatic remote control quick gas drainage device starts to work and quickly drains the ejected gas. After the hanging flexible bag 7 returns to normal, the operator operates the manual pneumatic control valve 11 to close the bag-type pneumatic remote control quick gas drainage device.

[0036] When the wear of the plug-in quick-opening anti-blowout sealing leather gasket straight-through inner sealing leather gasket 5 is serious or there is a blowhole, the gas in the negative-pressure gas collection box 3 may increase significantly. The extraction negative pressure and flow rate of the gas extraction pipe orifice 9 can be temporarily adjusted to increase the gas extraction capacity and avoid gas escaping into the drill field air current and causing gas overrun. After the gas recovers and the drill is withdrawn, the upper sealing leather gasket cover plate 4 of the plug-in quick-opening anti-blowout sealing leather gasket straight-through can be quickly opened to directly replace the sealing leather gasket 5.

[0037] During the drilling construction process, when the abnormal drainage volume at the orifice of the hole is found, the detachable anti-blocking water slag discharge transparent elbow can be checked first. If the coal slag is blocked at the elbow, the threaded cap 14 can be quickly opened, and the elbow can be cleaned and dredged through the external thread straight-through at the bottom of the pipe 13. After dredging, tighten the threaded cap 14 to prevent water and slag leakage.

[0038] The utility model is designed with 3 sets of extraction systems in total, and the device has a stronger extraction capacity and can effectively solve the gas ejection in case of blowholes, wear and failure of the sealing device, etc.

[0039] Among them, the temporary extraction pipe orifice for drilling while extracting is used for the temporary extraction of the orifice gas during the normal construction of the drill hole;

[0040] The bag-type pneumatic remote control quick gas extraction device is used for extracting a large amount of gas ejected instantaneously during blowholes;

[0041] The negative-pressure gas collection box is used for collecting and extracting the high-concentration gas that escapes from the rear end of the flange-type blowout preventer five-way through the plug-in quick-opening anti-blowout sealing leather gasket straight-through.

Claims

1. A device for preventing blowout and remote rapid treatment of boreholes for underground directional gas extraction, characterized in that: It comprises a flange-type blowout prevention five-way (1), wherein the axial front end of the flange-type blowout prevention five-way (1) is connected to a sealing pipe drilled on the coal wall through a flange near a port on the coal wall side, the axial rear end of the flange-type blowout prevention five-way (1) is connected to an inserted quick-open blowout prevention sealing leather gasket through a flange, the axial upper front end of the flange-type blowout prevention five-way (1) is connected to a bag-type pneumatic remote-controlled rapid gas extraction device through a flange near a port on the coal wall side, the second port on the axial upper side of the flange-type blowout prevention five-way (1) is connected to a temporary extraction pipe port (2) for simultaneous drilling and extraction through a flange, and the axial lower side port of the flange-type blowout prevention five-way (1) is connected to a transparent elbow for water slag discharge that does not require disassembly and is blocked through a flange; One end of the inserted quick-opening anti-spray sealing pad is directly connected to a negative pressure gas collection box (3) via a flange.

2. According to claim 1, a device for preventing blowout and remote rapid treatment of underground directional gas extraction drilling holes, characterized in that: The insert-type quick-opening anti-spraying sealing leather gasket straight-through is a variable-diameter U-shaped structure. The diameters of the two ends of the insert-type quick-opening anti-spraying sealing leather gasket straight-through are consistent with the axial pipe diameter of the flange-type anti-spraying five-way (1). The middle part is a U-shaped groove. The pipe diameter of the U-shaped groove is larger than the pipe diameters of the two ends of the insert-type quick-opening anti-spraying sealing leather gasket straight-through. The upper part of the insert-type quick-opening anti-spraying sealing leather gasket straight-through is provided with a flip-up sealing leather gasket cover plate (4). A plurality of sealing leather gaskets (5) are arranged side by side in the U-shaped groove.

3. According to claim 2, a device for preventing blowout and remote rapid treatment of underground directional gas extraction drilling holes, characterized in that: The sealing leather pad (5) is made of a circular flame-retardant antistatic material, the inner ring diameter of which is the same as the diameter of the drill rod (15), and the outer ring diameter is between the axial pipe diameter of the flange-type blowout-proof five-way (1) and the U-groove pipe diameter.

4. According to claim 1, a device for preventing blowout and remote rapid treatment of underground directional gas extraction drilling holes, characterized in that: The bag-type pneumatic remote-controlled rapid gas extraction device comprises a tee (6), the lower vertical port of the tee (6) is connected to a flange-type blowout-proof five-way (1), the upper port of the tee (6) is connected to a hanging flexible bag (7) via a flange, the top of the hanging flexible bag (7) is connected to a tunnel roof via a lifting ring of a flange cover, the horizontal port of the tee (6) is connected to a gas extraction pipe port (9) via a pneumatic butterfly valve (8), the pneumatic butterfly valve (8) is connected to a manual pneumatic control valve (11) via a high-pressure hose (10), and the manual pneumatic control valve (11) is located at a drilling rig driver's operating platform away from the orifice.

5. According to claim 1, a device for preventing blowout and remote rapid treatment of boreholes for underground directional gas extraction, characterized in that: The temporary extraction pipe opening (2) is connected to the gas extraction pipeline in the tunnel.

6. The device for preventing blowout and remote rapid treatment of boreholes for underground directional gas extraction according to claim 1, characterized in that: The non-disassembly anti-blocking water-slag discharge transparent elbow comprises an anti-blocking transparent elbow (12) with a flange, one end of the anti-blocking transparent elbow (12) is connected to the flange-type anti-blowout five-way (1), and the other end is connected to the drilling site water-slag separation device and the drainage system.

7. The device for preventing blowout and remote rapid treatment of boreholes for underground directional gas extraction according to claim 6 is characterized in that: The anti-blocking transparent elbow (12) has a bending arc of 45°, and an external threaded through hole (13) is provided in the middle of the anti-blocking transparent elbow (12) towards the bottom, and a threaded cap (14) is provided on the external threaded through hole (13).

8. The device for preventing blowout and remote rapid treatment of boreholes for underground directional gas extraction according to claim 1 is characterized in that: The negative pressure gas collection box (3) is a rectangular hollow structure, one end of which is directly connected to an insertable quick-opening anti-blowout sealing pad, and the other end is provided with a drill rod extension port, and the top end of the negative pressure gas collection box (3) is directly connected to a gas extraction pipe port (9).

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