CN110242256B - Efficient gas extraction device for drilling and segmenting - Google Patents
Efficient gas extraction device for drilling and segmenting Download PDFInfo
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- CN110242256B CN110242256B CN201910593292.7A CN201910593292A CN110242256B CN 110242256 B CN110242256 B CN 110242256B CN 201910593292 A CN201910593292 A CN 201910593292A CN 110242256 B CN110242256 B CN 110242256B
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- 238000000605 extraction Methods 0.000 title claims abstract description 183
- 238000005553 drilling Methods 0.000 title claims abstract description 25
- 238000007789 sealing Methods 0.000 claims abstract description 40
- 230000004323 axial length Effects 0.000 claims abstract description 5
- 239000003245 coal Substances 0.000 claims description 11
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 8
- 238000005086 pumping Methods 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 claims 4
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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Abstract
The invention discloses a drilling subsection high-efficiency gas extraction device, and relates to the technical field of gas extraction, wherein an extraction mechanism can detect the leakage condition in the gas extraction process so as to prevent the gas leakage in the gas extraction process; the extraction pipe is provided with a sealing interval structure which can divide a drill hole of an extraction hole into a plurality of unit extraction spaces along the axial length direction of the drill hole; the extraction pipe is provided with extraction radial holes which correspond to unit extraction spaces one by one along the length direction of the extraction pipe, and the extraction radial holes are provided with extraction control valves; when gas is extracted, the fracturing increasing pipe performs fracturing increasing, the extraction mechanism performs suction extraction on the extraction pipe, and after a period of extraction, the extraction control valves in the unit extraction spaces are sequentially and alternately opened from inside to outside in turn so as to sequentially and intensively extract each region.
Description
Technical Field
The invention relates to the technical field of gas extraction, in particular to a device for efficiently extracting gas by drilling and segmenting.
Background
The coal mine gas extraction is to drill a coal seam and a gas gathering area, connect a drill hole on a special pipeline, and extract gas in the coal seam and a goaf to the ground by using extraction equipment for utilization; or the gas is discharged into the total return air flow, but the existing gas extraction equipment cannot take emergency measures in time after the pipeline is damaged, and can cause explosion in serious cases, so that the life and property safety of people is seriously lost, when the pressure in the mine is different from the outside, the extraction work is difficult to carry out, and the life safety of people is seriously harmed. Moreover, after the gas extraction is performed for a certain time, along with the gradual reduction of the gas, the gas is difficult to be completely extracted by adopting the common power, and the simple increase of the extraction power needs larger extraction equipment, so that the gas extraction efficiency and the cost are influenced.
Therefore, the invention provides a drilling and segmenting efficient gas extraction device, which aims to solve the problems in the background technology.
Disclosure of Invention
The invention aims to provide a drilling and subsection efficient gas extraction device to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a drilling segmented efficient gas extraction device comprises an extraction pipe, fracture increasing pipes and an extraction mechanism, wherein the extraction pipe extends into a drilling hole of a coal seam, a plurality of fracture increasing pipes are arranged on the coal seam around the drilling hole of the extraction pipe, the depth of each fracture increasing pipe is deeper than that of the extraction pipe, and the extraction mechanism is communicated with the extraction pipe; it is characterized in that the preparation method is characterized in that,
the gas extraction mechanism can detect the leakage condition in the gas extraction process so as to prevent the gas leakage in the gas extraction process;
the extraction pipe is provided with a sealing interval structure, and the sealing interval structure can divide a drill hole of an extraction hole into a plurality of unit extraction spaces along the axial length direction of the drill hole;
the extraction pipe is provided with extraction radial holes which correspond to the unit extraction spaces one by one along the length direction of the extraction pipe, and extraction control valves are arranged on the extraction radial holes;
when gas is extracted, the fracturing increasing pipe performs fracturing increasing, the extraction mechanism performs suction extraction on the extraction pipe, and after a period of extraction, the extraction control valves in the unit extraction spaces are sequentially and alternately opened from inside to outside in turn so as to sequentially and intensively extract each region.
Further, as preferred, sealed interval structure is the sealed dish, be provided with the expanding agent in the sealed dish, the sealed dish is followed and is taken out the pipe and stretch into the drilling after, the expanding agent makes the sealed dish closely laminates the drilling inner wall.
Further, as preferred, take out and adopt the mechanism and include the box, a side of box is provided with the intake pipe, the another side of box is provided with the outlet duct, one side that the inside bottom surface of box is close to the outlet duct is provided with the second grade suction pump, the opposite side of the inside bottom surface of box is provided with the one-level suction pipeline, be provided with the one-level between second grade suction pump and the one-level suction pipeline and take out the air control valve, the inductor is installed to the inside top surface of box, the below of inductor is provided with urgent pipeline.
Further, as preferred, the one end of urgent pipeline is connected with the second three-way valve, and the other end of urgent pipeline is connected with first three-way valve, the side and the bottom surface of first three-way valve are connected with main gas-supply pipe, and the below of first three-way valve is provided with the one-level suction pump, the surface of second grade suction pump is provided with O type sealing washer, the upper surface of one-level suction pipeline is provided with Y type sealing washer.
Further, as preferred, the surface cover of intake pipe has flowmeter and gas sensor, the surface of outlet duct is provided with the export ball valve.
Further, as preferred, the side of box is provided with control panel, the bottom of box is provided with the emergency treatment valve, the emergency treatment valve runs through in the bottom surface of box and is connected with second grade suction pump.
Further, preferably, the O-ring seals are disposed at all the interfaces except the interface between the main air pipe and the primary suction pipe.
Further, as preferred, the total root of main gas-supply pipe, the side of second three-way valve passes through the side sealing connection of main gas-supply pipe and first three-way valve, and the bottom surface of second three-way valve passes through the top surface sealing connection of main gas-supply pipe and second grade suction pump, the bottom surface of first three-way valve passes through the top surface sealing connection of main gas-supply pipe and one-level suction pump.
Further, preferably, a filter screen is arranged at the center of the Y-shaped sealing ring, and one end of the main gas pipe is connected with the primary suction pipeline in a sealing manner through the Y-shaped sealing ring;
further, the invention provides a gas extraction method, which comprises the following steps:
(1) drilling an extraction hole and a fracture-increasing hole in a coal seam, respectively placing an extraction pipe and a fracture-increasing pipe in the extraction hole and the fracture-increasing hole, and expanding an expanding agent in a sealing disc to enable the sealing disc to divide the extraction hole into a plurality of unit extraction spaces;
(2) communicating the crack increasing equipment with a crack increasing pipe, and communicating the extraction mechanism with an extraction pipe;
(3) the extraction mechanism is used for extracting the extraction pipe while the fracture increasing equipment is used for increasing the fracture of the fracture increasing pipe;
after certain time of extraction, the extraction control valves in the extraction spaces of each unit are sequentially opened alternately from inside to outside in turn so as to extract all the areas in sequence and intensively;
(4) when the gas is extracted, a primary suction pump is started to work, gas firstly enters an air inlet pipe, a flow meter and a gas sensor on the air inlet pipe measure the gas concentration in a pipeline, the gas concentration is kept within a safe range, then, before the gas enters a main gas pipe, larger particles in the gas are filtered out through a filter screen, the particles are prevented from entering the primary suction pump and damaging elements inside the primary suction pump, then, the gas enters the main gas pipe through a first three-way valve, an interface of the main gas pipe is in sealing connection through a rubber ring, the gas is effectively prevented from leaking, and then, the gas enters a secondary suction pump through a second three-way valve;
(5) when the pressure inside the air inlet pipe is inconsistent, the first three-way valve is closed, the primary air extraction control valve is opened to adjust the internal pressure of the air inlet pipe, the emergency treatment valve ensures that gas at the secondary suction pump cannot leak into the air, and finally the gas is discharged out of the equipment through the air outlet pipe;
(6) when the main gas pipe is damaged to cause gas leakage, the sensor adjusts the second three-way valve and the first three-way valve through the control panel, and at the moment, the gas enters the secondary suction pump through the emergency pipeline to ensure that the gas cannot leak into the air.
Compared with the prior art, the invention has the beneficial effects that:
(1) the gas extraction mechanism can detect the leakage condition in the gas extraction process so as to prevent gas leakage in the gas extraction process; the extraction pipe is provided with a sealing interval structure which can divide a drill hole of an extraction hole into a plurality of unit extraction spaces along the axial length direction of the drill hole; the extraction pipe is provided with extraction radial holes which correspond to unit extraction spaces one by one along the length direction of the extraction pipe, and the extraction radial holes are provided with extraction control valves; when gas is extracted, the fracture increasing pipe performs fracture increasing, the extraction mechanism performs suction extraction on the extraction pipe, and after a period of extraction, the extraction control valves in each unit extraction space are sequentially opened alternately from inside to outside in turn so as to sequentially and intensively extract each region;
(2) when the device works, the gas concentration in the pipeline can be measured by the flow meter and the gas sensor on the gas inlet pipe, the gas concentration is ensured to be kept within a safety range, the filter screen can filter out larger particles in the gas, the particles are prevented from entering the primary suction pump, the elements inside the primary suction pump are damaged, when the main gas pipe is damaged to cause gas leakage, the gas enters the secondary suction pump through the emergency pipeline, the gas is ensured not to leak into the air, and the life and property safety of people is damaged.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a drilling segmented high-efficiency gas extraction device;
FIG. 2 is a schematic structural diagram of an extraction mechanism of a drilling segmented high-efficiency gas extraction device;
FIG. 3 is a cross sectional view of an O-shaped sealing ring in a drilling segmented high-efficiency gas extraction device;
FIG. 4 is a cross sectional view of a Y-shaped sealing ring in a drilling segmented high-efficiency gas extraction device;
FIG. 5 is a flow chart of an emergency system in the drilling segmented high-efficiency gas extraction device.
Detailed Description
Referring to fig. 1-5, in the embodiment of the invention, a borehole segmented high-efficiency gas extraction device comprises an extraction pipe 20, fracture increasing pipes 22 and an extraction mechanism, wherein the extraction pipe 20 extends into a borehole of a coal seam, a plurality of fracture increasing pipes 22 are arranged on the coal seam around the borehole of the extraction pipe, the fracture increasing pipes are deeper than the extraction pipe 20, and the extraction mechanism is communicated with the extraction pipe; the gas extraction mechanism can detect the leakage condition in the gas extraction process so as to prevent the gas leakage in the gas extraction process; the extraction pipe 20 is provided with a sealing interval structure 23 which can divide a drill hole of an extraction hole into a plurality of unit extraction spaces 21 along the axial length direction of the drill hole; the extraction pipe is provided with extraction radial holes which correspond to the unit extraction spaces one by one along the length direction of the extraction pipe, and extraction control valves 24 are arranged on the extraction radial holes;
when gas is extracted, the fracturing increasing pipe performs fracturing increasing, the extraction mechanism performs suction extraction on the extraction pipe, and after a period of extraction, the extraction control valves in the unit extraction spaces are sequentially and alternately opened from inside to outside in turn so as to sequentially and intensively extract each region.
In this embodiment, sealed interval structure 23 is sealed the dish, be provided with the expanding agent in the sealed dish, sealed dish is followed and is taken out the pipe and stretch into the drilling after, the expanding agent makes sealed dish closely laminates the drilling inner wall.
The extraction mechanism comprises a box body 1, an air inlet pipe 11 is arranged on one side face of the box body 1, an air outlet pipe 4 is arranged on the other side face of the box body 1, a second-stage suction pump 5 is arranged on one side, close to the air outlet pipe 4, of the bottom face inside the box body 1, a first-stage suction pipeline 14 is arranged on the other side of the bottom face inside the box body 1, a first-stage extraction control valve 15 is arranged between the second-stage suction pump 5 and the first-stage suction pipeline 14, an inductor 6 is installed on the top face inside the box body 1, and an emergency pipeline 7 is arranged below the inductor 6.
As a better embodiment, one end of the emergency pipeline 7 is connected with the second three-way valve 2, the other end of the emergency pipeline 7 is connected with the first three-way valve 9, the side surface and the bottom surface of the first three-way valve 9 are connected with the main gas pipe 8, a primary suction pump 18 is arranged below the first three-way valve 9, an O-shaped sealing ring 16 is arranged on the surface of the secondary suction pump 5, and a Y-shaped sealing ring 17 is arranged on the upper surface of the primary suction pipeline 14.
In the invention, the surface of the air inlet pipe 11 is sleeved with a flowmeter 12, and the surface of the air outlet pipe 4 is provided with an outlet ball valve 3.
The side of the box body 1 is provided with a control panel 10, the bottom of the box body 1 is provided with an emergency treatment valve 13, and the emergency treatment valve 13 penetrates through the bottom surface of the box body 1 and is connected with the secondary suction pump 5. The O-ring seals 16 are provided at all but the interface between the main air delivery conduit 8 and the primary suction conduit 14.
As a better embodiment, the number of the main air pipes 8 is 4, the side surface of the second three-way valve 2 is hermetically connected with the side surface of the first three-way valve 9 through the main air pipes 8, the bottom surface of the second three-way valve 2 is hermetically connected with the top surface of the secondary suction pump 5 through the main air pipes 8, and the bottom surface of the first three-way valve 9 is hermetically connected with the top surface of the primary suction pump 18 through the main air pipes 8. A filter screen 19 is arranged at the central position of the Y-shaped sealing ring 17, and one end of the main gas pipe 8 is hermetically connected with the primary suction pipeline 14 through the Y-shaped sealing ring 17;
in addition, the invention provides a gas extraction method, which comprises the following steps:
(1) drilling an extraction hole and a fracture-increasing hole in a coal seam, respectively placing an extraction pipe and a fracture-increasing pipe in the extraction hole and the fracture-increasing hole, and expanding an expanding agent in a sealing disc to enable the sealing disc to divide the extraction hole into a plurality of unit extraction spaces;
(2) communicating the crack increasing equipment with a crack increasing pipe, and communicating the extraction mechanism with an extraction pipe;
(3) the extraction mechanism is used for extracting the extraction pipe while the fracture increasing equipment is used for increasing the fracture of the fracture increasing pipe;
(4) after certain time of extraction, the extraction control valves in the extraction spaces of each unit are sequentially opened alternately from inside to outside in turn so as to extract all the areas in sequence and intensively;
(5) when the gas is extracted, the primary suction pump 18 is started to work, gas firstly enters the gas inlet pipe 11, the flow meter 12 on the gas inlet pipe 11 measures the gas concentration in the pipeline to ensure that the gas concentration is kept within a safe range, then, before the gas enters the main gas conveying pipe 8, larger particles in the gas are filtered out through the filter screen 19, the particles are prevented from entering the primary suction pump 18 and damaging elements inside the primary suction pump 18, then, the gas enters the main gas conveying pipe 8 through the first three-way valve 9, the interface of the main gas conveying pipe 8 is in sealing connection through the rubber ring, the gas is effectively prevented from leaking, and then, the gas enters the secondary suction pump 5 through the second three-way valve 2;
(6) when the pressure intensity inside the air inlet pipe 11 is inconsistent, the first three-way valve 9 is closed, the primary pumping control valve 15 is opened to adjust the internal pressure intensity of the air inlet pipe 11, the emergency treatment valve 13 ensures that the gas at the secondary pumping pump 5 cannot leak into the air, and finally the gas is discharged out of the equipment through the air outlet pipe 4;
(7) when the main gas pipe 8 is damaged to cause gas leakage, the sensor 6 adjusts the second three-way valve 2 and the first three-way valve 9 through the control panel 10, and at the moment, gas enters the secondary suction pump 5 through the emergency pipeline 7 to ensure that the gas cannot leak into the air.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.
Claims (3)
1. A drilling segmented efficient gas extraction device comprises an extraction pipe (20), fracture increasing pipes (22) and an extraction mechanism, wherein the extraction pipe (20) extends into an extraction hole, a plurality of fracture increasing pipes (22) are arranged on a coal seam around the extraction hole, the depth of each fracture increasing pipe is deeper than that of the extraction pipe (20), and the extraction mechanism is communicated with the extraction pipe; it is characterized in that the preparation method is characterized in that,
the gas extraction mechanism can detect the leakage condition in the gas extraction process so as to prevent the gas leakage in the gas extraction process;
the extraction pipe (20) is provided with a sealing interval structure (23), and the sealing interval structure can divide a drill hole of an extraction hole into a plurality of unit extraction spaces (21) along the axial length direction of the drill hole;
the extraction pipe is provided with extraction radial holes which correspond to the unit extraction spaces one by one along the length direction, and the extraction radial holes are provided with extraction control valves (24);
when gas is extracted, the fracture increasing pipe performs fracture increasing, the extraction mechanism performs suction extraction on the extraction pipe, and after a period of extraction, the extraction control valves in each unit extraction space are sequentially opened alternately from inside to outside in turn so as to sequentially and intensively extract each region;
the sealing interval structure (23) is a sealing disc, an expanding agent is arranged in the sealing disc, and after the sealing disc extends into the drill hole along with the extraction pipe, the expanding agent enables the sealing disc to be tightly attached to the inner wall of the drill hole;
the extraction mechanism comprises a box body (1), an air inlet pipe (11) is arranged on one side face of the box body (1), an air outlet pipe (4) is arranged on the other side face of the box body (1), a secondary suction pump (5) is arranged on one side, close to the air outlet pipe (4), of the bottom face of the interior of the box body (1), a primary suction pipeline (14) is arranged on the other side of the bottom face of the interior of the box body (1), a primary extraction control valve (15) is arranged between the secondary suction pump (5) and the primary suction pipeline (14), an inductor (6) is installed on the top face of the interior of the box body (1), and an emergency pipeline (7) is arranged below the inductor (6);
one end of the emergency pipeline (7) is connected with a second three-way valve (2), the other end of the emergency pipeline (7) is connected with a first three-way valve (9), the side surface and the bottom surface of the first three-way valve (9) are connected with main gas conveying pipes (8), a primary suction pump (18) is arranged below the first three-way valve (9), an O-shaped sealing ring (16) is arranged on the surface of the secondary suction pump (5), and a Y-shaped sealing ring (17) is arranged on the upper surface of the primary suction pipeline (14);
a flowmeter and a gas sensor (12) are sleeved on the surface of the air inlet pipe (11), and an outlet ball valve (3) is arranged on the surface of the air outlet pipe (4);
a control panel (10) is arranged on the side surface of the box body (1), an emergency treatment valve (13) is arranged at the bottom of the box body (1), and the emergency treatment valve (13) penetrates through the bottom surface of the box body (1) and is connected with the secondary suction pump (5);
the number of the main gas transmission pipes (8) is 4, the side surface of the second three-way valve (2) is hermetically connected with the side surface of the first three-way valve (9) through the main gas transmission pipe (8), the bottom surface of the second three-way valve (2) is hermetically connected with the top surface of the secondary suction pump (5) through the main gas transmission pipe (8), and the bottom surface of the first three-way valve (9) is hermetically connected with the top surface of the primary suction pump (18) through the main gas transmission pipe (8);
the gas extraction method of the drilling subsection high-efficiency gas extraction device comprises the following steps:
(1) drilling an extraction hole and a fracture-increasing hole in a coal seam, respectively placing an extraction pipe and a fracture-increasing pipe in the extraction hole and the fracture-increasing hole, and expanding an expanding agent in a sealing disc to enable the sealing disc to divide the extraction hole into a plurality of unit extraction spaces;
(2) communicating the crack increasing equipment with a crack increasing pipe, and communicating the extraction mechanism with an extraction pipe;
(3) the extraction mechanism is used for extracting the extraction pipe while the fracture increasing equipment is used for increasing the fracture of the fracture increasing pipe;
(4) after certain time of extraction, the extraction control valves in the extraction spaces of each unit are sequentially opened alternately from inside to outside so as to sequentially and intensively extract all the areas;
(5) when the gas is extracted, a primary suction pump (18) is started to work, gas firstly enters an air inlet pipe (11), a flow meter and a gas sensor (12) on the air inlet pipe (11) measure the gas concentration in a pipeline, the gas concentration is ensured to be kept within a safety range, then before the gas enters a main gas pipe (8), larger particles in the gas are filtered out through a filter screen (19), the particles are prevented from entering the primary suction pump (18), elements in the primary suction pump (18) are damaged, then the gas enters the main gas pipe (8) through a first three-way valve (9), the interface of the main gas pipe (8) is connected in a sealing mode through a rubber ring, the gas is effectively prevented from leaking, and then the gas enters a secondary suction pump (5) through a second three-way valve (2);
(6) when the pressure intensity inside the air inlet pipe (11) is inconsistent, the first three-way valve (9) is closed, the primary pumping control valve (15) is opened to adjust the internal pressure intensity of the air inlet pipe (11), the emergency treatment valve (13) ensures that gas at the secondary pumping pump (5) cannot leak into the air, and finally the gas is discharged out of the equipment through the air outlet pipe (4);
(7) when the main gas pipe (8) between the second three-way valve (2) and the first three-way valve (9) is damaged to cause gas leakage, the sensor (6) adjusts the second three-way valve (2) and the first three-way valve (9) through the control panel (10), and at the moment, gas enters the secondary suction pump (5) through the emergency pipeline (7) to ensure that the gas cannot leak into the air.
2. The drilling and subsection high-efficiency gas extraction device according to claim 1, wherein the O-shaped sealing rings (16) are arranged at all the interfaces except the interface between the main gas conveying pipe (8) and the primary suction pipeline (14).
3. The drilling and subsection efficient gas extraction device according to claim 1, wherein a filter screen (19) is arranged at the center of the Y-shaped sealing ring (17), and one end of the main gas pipe (8) is hermetically connected with the primary suction pipeline (14) through the Y-shaped sealing ring (17).
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| CN111188646B (en) * | 2020-01-13 | 2021-04-27 | 河南理工大学 | Low gas permeability coal seam gas drainage equipment |
| CN111156049B (en) * | 2020-02-24 | 2021-04-27 | 河南理工大学 | Coal mine gas extraction device |
| CN113309491B (en) * | 2021-06-21 | 2022-04-26 | 中国地质大学（北京） | Efficient combined mining device and method for combined mining of multiple coal seams |
| CN113550783B (en) * | 2021-08-30 | 2022-06-10 | 安徽理工大学 | Intelligent coal mine underground gas extraction device |
| CN114352262B (en) * | 2022-01-20 | 2023-05-12 | 河南理工大学 | Coal mine gas outburst prediction device |
| CN114837646B (en) * | 2022-05-05 | 2023-11-24 | 中联煤层气国家工程研究中心有限责任公司 | Multilayer co-mining device for coal bed gas mining |
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| US4109719A (en) * | 1976-04-05 | 1978-08-29 | Continental Oil Company | Method for creating a permeable fragmented zone within a subterranean carbonaceous deposit for in situ coal gasification |
| CN107304667A (en) * | 2016-04-21 | 2017-10-31 | 中国石油天然气股份有限公司 | Completion tubular column |
| CN105927270A (en) * | 2016-07-05 | 2016-09-07 | 重庆大学 | Gas extraction method for parallel hole arrangement of L-shaped drilling and fracturing weakening top plate |
| CN205823322U (en) * | 2016-07-19 | 2016-12-21 | 淮南宏昌科技有限责任公司 | A kind of boring arrangement of coal seam high-pressure hydraulic slot pressure break |
| CN106285604B (en) * | 2016-11-01 | 2019-03-01 | 中国矿业大学 | Microwave-assisted supercritical carbon dioxide cyclic fracturing system and method |
| CN109025937B (en) * | 2018-06-22 | 2020-09-08 | 中国矿业大学 | Hydraulic slotting and multistage combustion shock wave combined fracturing coal body gas extraction method |
| CN109736878B (en) * | 2019-01-11 | 2020-06-16 | 微山金源煤矿 | Unmanned automatic gas extraction system |
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