CN109372572A - A kind of efficient pumping method of low-permeability coal-bed gas - Google Patents
A kind of efficient pumping method of low-permeability coal-bed gas Download PDFInfo
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- CN109372572A CN109372572A CN201811559044.2A CN201811559044A CN109372572A CN 109372572 A CN109372572 A CN 109372572A CN 201811559044 A CN201811559044 A CN 201811559044A CN 109372572 A CN109372572 A CN 109372572A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/263—Methods for stimulating production by forming crevices or fractures using explosives
Abstract
The present invention provides a kind of method of efficient pumping method of low-permeability coal-bed gas, belongs to coal bed gas extraction technical field, the efficient pumping method of low-permeability coal-bed gas specifically includes the following steps: coal yard drill site arrangement；The measurement of drill site distance；The arrangement of dibit drilling；The measurement of low-permeability coal seam mechanical property；The pressure release of firedamp layer；The pressurization of methane gas samples；The sealing of tube sample boring；The safety detection of coal-bed gas sampling drill site.Dibit hole pumping and mining is increased hydrogen sampling mode with high pressure and combined by a kind of efficient pumping method of low-permeability coal-bed gas of the present invention；Drilling can be exploited at the subsiding center in coal seam, achieve the purpose that coal seam internal pressure relief creates advantage for the release and flowing of gas, utilize the subsequent reaming that first drills, improve effective coverage of drilling, the gas permeability of coal body is improved simultaneously, the gas permeability to working seam is improved, the combination of two kinds of sampling modes improves the efficiency of extraction.
Description
Technical field
The invention belongs to coal bed gas extraction technical field more particularly to a kind of efficient extraction sides of low-permeability coal-bed gas
Method.
Background technique
Coal still occupies very important status in China's energy consumption structure, and 2016, consumption of coal specific gravity was
62.6%, it is contemplated that 2017 about 60% or so.China coal seam is commonly low-permeability coal seam, and compared to foreign countries, China coal seam is seeped
Permeability generally wants the small 2-3 order of magnitude, and low-permeability causes many coal mine rock burst accidents in China, coal and gas prominent thing
Therefore take place frequently, while highly gassy mine due to coal seam permeability it is lower, cause gas drainage difficult, these problems all seriously hinder
The exploitation of China's coal-mine highly effective and safe.In the coal resources that China has found, there is nearly half buried depth to be greater than 1000m, it is old at present
The gradually atrophy of mining area coal, the exploitation of coal resources in China will be transferred to Deep Mine exploitation in the future.Deep Mine faces highland and answers
The case where power, high methane pressure, China coal seam is commonly low-permeability coal seam in addition, easily causes bump, coal and gas
The disaster accidents such as prominent seriously restrict the exploitation of mine high-efficiency intensifying and safety in production.Coal mine low-permeability coal seam is also referred to as
Low air permeability coal seam needs to ensure the exploitation of low air permeability coal seam high-efficiency intensifying and safety in production to low-permeability coal seam watt
This efficient pumping method is studied.
Currently, the anti-reflection measure of low air permeability coal seam presplitting mainly include deep hole standing shot, hydrofracturing, hydraulic flushing in hole,
The methods of Mining Protective Seam, hydraulic slotted liner technique.Wherein deep hole standing shot to drill neighbouring coal seam fried it is very broken, but to from
The slightly remote local presplitting effect that drills declines rapidly, and presplitting radius is smaller, and effect is bad；Additionally, due to the induced detonation of coal mining explosive
Distance is smaller, and to prevent from miss-firing, site operation needs primacord to be coupled, therefore, site operation trouble；Besides explosive presplitting,
It is possible that cause the region gas explosion be connected by crack, it is dangerous.If hydraulic fracturing hydraulic pressure is small, crack expansion is limited, in advance
It is bad to split effect；If hydraulic pressure is big, high pressure water can be flowed out from biggish crack, and presplitting is uneven, and effect is bad；And high pressure water exists
Flowing in coal seam is uncontrollable.Hydraulic flushing in hole is drilled by sluicing, wash boring hole wall while expanding bore diameter
Coal dust, so that the wall of a borehole is had better permeability, due to this method for improve gas permeability of coal seam effect it is very small, at present substantially not
It uses again.Mining Protective Seam often closes on Protective Coal Seam thickness very little due to the limitation of condition of coal seam occurrence, it is difficult to it exploits, or
Coal quality is poor, does not close on Protective Coal Seam without extraction value or even many coal seams, so that the technology is not available.Hydraulic slotted liner technique
It is limited by equipment, so that the implementing process of this technology is complicated, it is difficult to promote and apply at the scene.
The exploitation of high gassy and low permeability coal seam is usually associated with gushing out for a large amount of gas, in particular with coal production
The outburst amount of the increase of high-efficiency intensifying and mining depth, gas is increasing, the threat of gas explosion and Gas Outburst danger
Increasingly severe, Gas Disaster has become the most important factor for restricting high-efficiency intensifying production technique development and safety in production.
Therefore, how in effective solution high gas layer recovery process the problem of Gas, have very to Safety of Coal Mine Production
Important meaning.
China Patent Publication No. is CN101915085B, a kind of entitled low-air-permeability coal-bed gas extraction of innovation and creation
Method.Solve the problems, such as that existing underground coal mine causes drainage efficient low due to gas permeability of coal seam difference.A kind of low air permeability coal seam
Gas pumping method, in the surface well pressure break zone of influence of underground construction directional drilling penetrated surface drilling well, to surface well pressure break shadow
It rings regional coal-seam gas and carries out extraction.
But that there is extraction ways is single for existing low-permeability coal bed gas extraction method, extraction efficiency it is lower and
The poor problem of safety.
Therefore, a kind of efficient pumping method of low-permeability coal-bed gas is invented to be very necessary.
Summary of the invention
In order to solve the above technical problem, the present invention provides a kind of efficient pumping methods of low-permeability coal-bed gas, with solution
That there is extraction ways is single for certainly existing low-permeability coal bed gas extraction method, and extraction efficiency is lower and safety is poor
Problem.A kind of efficient pumping method of low-permeability coal-bed gas specifically includes the following steps:
Step 1: the arrangement of coal yard drill site；
Step 2: the measurement of drill site distance；
Step 3: the arrangement of dibit drilling；
Step 4: the measurement of low-permeability coal seam mechanical property；
Step 5: the pressure release of firedamp layer；
Step 6: the pressurization sampling of methane gas；
Step 7: the sealing of tube sample boring；
Step 8: the safety detection of coal-bed gas sampling drill site.
Preferably, in step 1, multiple drill sites are arranged on the stable top plate of coal yard；The drill site is apart from working face
Distance is arranged in 100m~150m.
Preferably, in step 2, spacing is 80m~100m between each drill site；The wide setting of the drill site
In 5m~8m, depth 3m~4m.
Preferably, in step 3,8 dibit drillings are arranged in each drill site；The bore diameter is arranged in 60mm
~150mm；The drilling depth is 100m~120m；And makes the position of drilling in the subsiding center in coal seam, and be in
At the pressure release band in coal seam.
Preferably, in step 4, the process of the measurement of the low-permeability coal seam mechanical property the following steps are included:
S401: drilling operation coal seam tube sample boring: is carried out with the equipment in step 3.
S402: the installation of sampling line: coal sampling pipeline is installed additional in drilling.
S403: to take coal sample in working seam: the compression strength of coal body is measured by sampling from coal seam with sampling equipment, determines
To working seam depth, guarantee the accuracy of detection.
S404: the measurement of highest gas injection pressure: the coal cinder pressure of sampling is detected, to obtain high pressure by inferring
The highest gas injection pressure of gas gas injection.
S405: coal sample seals protection up for safekeeping: after detection, approved sample preservation is carried out to coal seam sample block, when facilitating subsequent use
It searches.
Preferably, in step 5, the process of the pressure release of the firedamp layer the following steps are included:
S501: coal bed drilling: tube sample boring is not extended drilling along step 4；The depth of the drilling is to mine
0.2 times to 0.5 times of face length；The vertical height of the drilling is 0.2 times to 0.4 times of coal working face height；
The horizontal space of the adjacent drilling is set as 10m to 20m.
S502: explosive Uncoincided charge: is packed into drilling using Uncoincided charge mode；The powder charge of the explosive is long
Degree is 0.3 to 0.6 times of drillable length.
S503: hole sealing tube the installation of hole sealing tube: is installed in drilling.
S504: reserved pressure duct the erection of pressure duct: is installed in drilling；The pressure duct is located in drilling
Length be 0.6 times to 0.8 times of drilling depth；The end of the pressure duct stretch out the length setting of drilling 1m extremely
1.5m。
S505: corresponding pressure relief equipment the installation connection of pressure relief equipment: is installed on the provided pipe of pressure duct.
Preferably, in step 6, the process of the sampling of the methane gas the following steps are included:
S601: it methane gas pressure release extraction: will be arrived below drainage tube in the drilling dug in conjunction with the S505 in step 5
In hole sealing tube, pressure release extraction is carried out to coal-bed gas.
S602: the sealing of hole of drilling: cement material sealing of hole is used, the ratio of cement and water is 1:0.3 to 1 in cement material:
0.6；The length of the cementing is 0.2 to 0.4 times of drilling depth.
S603: by the S504 in step 5, high pressure gas the injection of high pressure gas: is injected into drilling with pressure duct
Body, the pressure for injecting high pressure gas are gradually increased to highest gas injection pressure and keep, highest gas injection pressure by step 4 determine,
Injection high-pressure gas flow still keeps 4 hours of highest gas injection pressure to 6 hours after obviously becoming smaller and stablize；The height
Body of calming the anger is the mixed gas of hydrogen and air；The volume fraction of hydrogen is 20% to 25% in the mixed gas.
S604: ignition charge presplitting is anti-reflection: within the time that injection high pressure gas keeps highest gas injection pressure, detonation step
It is anti-reflection to carry out presplitting to coal seam for the explosive that S502 is added in drilling in five.
S605: the pressurization sampling of methane gas: extraction pipeline is connected with pressure duct, extraction waits for watt in working seam
This.
Preferably, it in step 7, is sealed with the position that is in contact of drilling with polyurethane in drainage tube, avoids extraction
The leakage of gas in the process fixes one piece of towel or sackcloth in the seal section of drilling, and polyurethane mixed liquor is poured on towel
Or on sackcloth, in Dao Ye on hole sealing tube circumvolution towel or sackcloth, then by circumvolution it is good hole sealing tube insertion drilling in,
And it is with timber wedge that hole sealing tube and the wall of a borehole wedging is secured, while hole sealing tube is fixed with cement at sealing of hole.
Preferably, in step 8, gas detection protection is carried out to sampling drill site, prevents the leakage of methane gas, and set
Found corresponding warning sign.
Compared with prior art, the invention has the following beneficial effects: due to a kind of low-permeability coal seam watt of the invention
Dibit hole pumping and mining is increased hydrogen sampling mode with high pressure and combined by this efficient pumping method；It can be in the sedimentation in coal seam
Drilling is exploited at the heart, to achieve the purpose that coal seam internal pressure relief creates advantage for the release and flowing of gas, is utilized
First drill, subsequent reaming improves effective coverage of drilling, while improving the gas permeability of coal body, by hole sealing tube with
Drainage tube connection avoids high methane and occurs the problem of leaking a bit during extraction；When increasing explosive charge in drilling,
A large amount of quick-fried raw high pressure gas that explosion initial stage generates pass through hydrostatic pressure in working seam with having high pressure gas in drilling
The cracks in coal seam of connection and non-connection, hole, micropore, semiclosed hole keep cracks in coal seam, hole net connection network further
Development, improves the gas permeability to working seam, and the combination of two kinds of sampling modes improves the efficiency of extraction.
Detailed description of the invention
Fig. 1 is the efficient pumping method flow chart of low-permeability coal-bed gas.
Fig. 2 is the flow chart of the continuous mode of low-permeability coal seam mechanical property.
Fig. 3 is the flow chart of the pressure leak process of firedamp layer.
Fig. 4 is the flow chart of the sampling process of methane gas.
Specific embodiment
The present invention is described further below in conjunction with attached drawing:
As shown in Fig. 1
A kind of efficient pumping method of low-permeability coal-bed gas specifically includes the following steps:
S101: the arrangement of coal yard drill site；
S102: the measurement of drill site distance；
S103: the arrangement of dibit drilling；
S104: the measurement of low-permeability coal seam mechanical property；
S105: the pressure release of firedamp layer；
S106: the pressurization sampling of methane gas；
S107: the sealing of tube sample boring；
S108: the safety detection of coal-bed gas sampling drill site.
In above-described embodiment, specifically, arranging multiple drill sites on the stable top plate of coal yard in S101；The brill
Field is arranged apart from working face distance in 100m~150m.
In above-described embodiment, specifically, spacing is 80m~100m between each drill site in S102；Described
Drill site is wide to be arranged in 5m~8m, depth 3m~4m.
In above-described embodiment, specifically, arranging 8 dibit drillings in each drill site in S103；The bore diameter
It is arranged in 60mm~150mm；The drilling depth is 100m~120m；And make the position of drilling in the sedimentation in coal seam
The heart, and at the pressure release band in coal seam.
As shown in Fig. 2, in above-described embodiment, specifically, in S104, the low-permeability coal seam mechanical property
The process of measurement the following steps are included:
S401: drilling operation coal seam tube sample boring: is carried out with the equipment in S103.
S402: the installation of sampling line: coal sampling pipeline is installed additional in drilling.
S403: to take coal sample in working seam: the compression strength of coal body is measured by sampling from coal seam with sampling equipment, determines
To working seam depth, guarantee the accuracy of detection.
S404: the measurement of highest gas injection pressure: the coal cinder pressure of sampling is detected, to obtain high pressure by inferring
The highest gas injection pressure of gas gas injection.
S405: coal sample seals protection up for safekeeping: after detection, approved sample preservation is carried out to coal seam sample block, when facilitating subsequent use
It searches.
As shown in Fig. 3, in above-described embodiment, specifically, in S105, the process of the pressure release of the firedamp layer includes
Following steps:
S501: coal bed drilling: tube sample boring is not extended drilling along S104；The depth of the drilling is coal-getter
0.2 times to 0.5 times for making face length；The vertical height of the drilling is 0.2 times to 0.4 times of coal working face height；Institute
The horizontal space for the adjacent drilling stated is set as 10m to 20m.
S502: explosive Uncoincided charge: is packed into drilling using Uncoincided charge mode；The powder charge of the explosive is long
Degree is 0.3 to 0.6 times of drillable length.
S503: hole sealing tube the installation of hole sealing tube: is installed in drilling.
S504: reserved pressure duct the erection of pressure duct: is installed in drilling；The pressure duct is located in drilling
Length be 0.6 times to 0.8 times of drilling depth；The end of the pressure duct stretch out the length setting of drilling 1m extremely
1.5m。
S505: corresponding pressure relief equipment the installation connection of pressure relief equipment: is installed on the provided pipe of pressure duct.
As shown in Fig. 4, in above-described embodiment, specifically, in S106, the process packet of the sampling of the methane gas
Include following steps:
S601: the envelope in the drilling dug methane gas pressure release extraction: will be arrived below drainage tube in conjunction with the S505 in S105
Kong Guanzhong carries out pressure release extraction to coal-bed gas.
S602: the sealing of hole of drilling: cement material sealing of hole is used, the ratio of cement and water is 1:0.3 to 1 in cement material:
0.6；The length of the cementing is 0.2 to 0.4 times of drilling depth.
S603: the injection of high pressure gas: by the S504 in S105, injecting high pressure gas into drilling with pressure duct,
The pressure of injection high pressure gas is gradually increased to highest gas injection pressure and keeps, and highest gas injection pressure in S104 by determining, injection
High-pressure gas flow still keeps 4 hours of highest gas injection pressure to 6 hours after obviously becoming smaller and stablize；The high pressure gas
Body is the mixed gas of hydrogen and air；The volume fraction of hydrogen is 20% to 25% in the mixed gas.
S604: ignition charge presplitting is anti-reflection: within the time that injection high pressure gas keeps highest gas injection pressure, igniting S105
It is anti-reflection to carry out presplitting to coal seam for the explosive that middle S502 is added in drilling.
S605: the pressurization sampling of methane gas: extraction pipeline is connected with pressure duct, extraction waits for watt in working seam
This.
In above-described embodiment, specifically, being sealed with the position that is in contact of drilling with polyurethane in S107 in drainage tube
Mouthful, the leakage of gas during extraction is avoided, in the seal section of drilling, one piece of towel or sackcloth is fixed, polyurethane is mixed
Liquid is closed to be poured on towel or sackcloth, in Dao Ye on hole sealing tube circumvolution towel or sackcloth, the then sealing of hole that circumvolution is good
In pipe insertion drilling, and it is with timber wedge that hole sealing tube and the wall of a borehole wedging is secured, while hole sealing tube is fixed with cement at sealing of hole.
In above-described embodiment, specifically, carrying out gas detection protection in S108 to sampling drill site, preventing methane gas
Leakage, and establish corresponding warning sign.
Compared with prior art, the invention has the following beneficial effects: due to a kind of low-permeability coal seam watt of the invention
Dibit hole pumping and mining is increased hydrogen sampling mode with high pressure and combined by this efficient pumping method；It can be in the sedimentation in coal seam
Drilling is exploited at the heart, to achieve the purpose that coal seam internal pressure relief creates advantage for the release and flowing of gas, is utilized
First drill, subsequent reaming improves effective coverage of drilling, while improving the gas permeability of coal body, by hole sealing tube with
Drainage tube connection avoids high methane and occurs the problem of leaking a bit during extraction；When increasing explosive charge in drilling,
A large amount of quick-fried raw high pressure gas that explosion initial stage generates pass through hydrostatic pressure in working seam with having high pressure gas in drilling
The cracks in coal seam of connection and non-connection, hole, micropore, semiclosed hole keep cracks in coal seam, hole net connection network further
Development, improves the gas permeability to working seam, and the combination of two kinds of sampling modes improves the efficiency of extraction.
Using technical solutions according to the invention or those skilled in the art under the inspiration of technical solution of the present invention,
Similar technical solution is designed, and reaches above-mentioned technical effect, is to fall into protection scope of the present invention.
Claims (9)
1. a kind of efficient pumping method of low-permeability coal-bed gas, which is characterized in that the efficient extraction of low-permeability coal-bed gas
Method specifically includes the following steps:
Step 1: the arrangement of coal yard drill site；
Step 2: the measurement of drill site distance；
Step 3: the arrangement of dibit drilling；
Step 4: the measurement of low-permeability coal seam mechanical property；
Step 5: the pressure release of firedamp layer；
Step 6: the pressurization sampling of methane gas；
Step 7: the sealing of tube sample boring；
Step 8: the safety detection of coal-bed gas sampling drill site.
2. the efficient pumping method of low-permeability coal-bed gas as described in claim 1, which is characterized in that in step 1,
Multiple drill sites are arranged on the stable top plate of coal yard；The drill site is arranged apart from working face distance in 100m~150m.
3. the efficient pumping method of low-permeability coal-bed gas as described in claim 1, which is characterized in that in step 2, institute
Spacing is 80m~100m between each drill site stated；The drill site is wide to be arranged in 5m~8m, depth 3m~4m.
4. the efficient pumping method of low-permeability coal-bed gas as described in claim 1, which is characterized in that in step 3,
Each drill site arranges 8 dibit drillings；The bore diameter is arranged in 60mm~150mm；The drilling depth is 100m
~120m；And make the position of drilling in the subsiding center in coal seam, and at the pressure release band in coal seam.
5. the efficient pumping method of low-permeability coal-bed gas as described in claim 1, which is characterized in that in step 4, institute
The process of the measurement for the low-permeability coal seam mechanical property stated the following steps are included:
S401: drilling operation coal seam tube sample boring: is carried out with the equipment in step 3；
S402: the installation of sampling line: coal sampling pipeline is installed additional in drilling；
S403: to take coal sample in working seam: the compression strength of coal body is measured by sampling from coal seam with sampling equipment, determines wait open
Coal mining layer depth guarantees the accuracy of detection；
S404: the measurement of highest gas injection pressure: the coal cinder pressure of sampling is detected, to obtain high pressure gas by inferring
The highest gas injection pressure of gas injection；
S405: coal sample seals protection up for safekeeping: after detection, carrying out approved sample preservation to coal seam sample block, facilitates lookup when subsequent use.
6. the efficient pumping method of low-permeability coal-bed gas as described in claim 1, which is characterized in that in step 5, institute
The process of the pressure release for the firedamp layer stated the following steps are included:
S501: coal bed drilling: tube sample boring is not extended drilling along step 4；The depth of the drilling is coal work
0.2 times to 0.5 times of face length；The vertical height of the drilling is 0.2 times to 0.4 times of coal working face height；It is described
The horizontal space of adjacent drilling be set as 10m to 20m；
S502: explosive Uncoincided charge: is packed into drilling using Uncoincided charge mode；The loaded length of the explosive is
0.3 to 0.6 times of drillable length；
S503: hole sealing tube the installation of hole sealing tube: is installed in drilling；
S504: reserved pressure duct the erection of pressure duct: is installed in drilling；The pressure duct is located at the length in drilling
Degree is 0.6 times to 0.8 times of drilling depth；The length that drilling is stretched out in the end of the pressure duct is arranged in 1m to 1.5m；
S505: corresponding pressure relief equipment the installation connection of pressure relief equipment: is installed on the provided pipe of pressure duct.
7. the efficient pumping method of low-permeability coal-bed gas as described in claim 1, which is characterized in that in step 6, institute
The process of the sampling for the methane gas stated the following steps are included:
S601: the sealing of hole in the drilling dug methane gas pressure release extraction: will be arrived below drainage tube in conjunction with the S505 in step 5
Guan Zhong carries out pressure release extraction to coal-bed gas；
S602: the sealing of hole of drilling: using cement material sealing of hole, and the ratio of cement and water is 1:0.3 to 1:0.6 in cement material；
The length of the cementing is 0.2 to 0.4 times of drilling depth；
S603: the injection of high pressure gas: by the S504 in step 5, injecting high pressure gas into drilling with pressure duct, note
The pressure for entering high pressure gas is gradually increased to highest gas injection pressure and keeps, and highest gas injection pressure in step 4 by determining, injection
High-pressure gas flow still keeps 4 hours of highest gas injection pressure to 6 hours after obviously becoming smaller and stablize；The high pressure gas
Body is the mixed gas of hydrogen and air；The volume fraction of hydrogen is 20% to 25% in the mixed gas；
S604: ignition charge presplitting is anti-reflection: within the time that injection high pressure gas keeps highest gas injection pressure, in detonation step five
It is anti-reflection to carry out presplitting to coal seam for the explosive that S502 is added in drilling；
S605: the pressurization sampling of methane gas: extraction pipeline is connected with pressure duct, extraction waits for the gas in working seam.
8. the efficient pumping method of low-permeability coal-bed gas as described in claim 1, which is characterized in that in step 7,
Drainage tube is sealed with the position that is in contact of drilling with polyurethane, the leakage of gas during extraction is avoided, in the close of drilling
It seals in section, fixes one piece of towel or sackcloth, polyurethane mixed liquor is poured on towel or sackcloth, in Dao Ye to hole sealing tube
Upper circumvolution towel or sackcloth, then by the good hole sealing tube insertion drilling of circumvolution, and with timber wedge by hole sealing tube and the wall of a borehole wedge
It is tight secured, while hole sealing tube is fixed with cement at sealing of hole.
9. the efficient pumping method of low-permeability coal-bed gas as described in claim 1, which is characterized in that right in step 8
It samples drill site and carries out gas detection protection, prevent the leakage of methane gas, and establish corresponding warning sign.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110617103A (en) * | 2019-11-05 | 2019-12-27 | 西安闪光能源科技有限公司 | Coal mine underground gas drainage borehole permeability-increasing transformation method |
| CN110939478A (en) * | 2019-12-17 | 2020-03-31 | 华北科技学院 | Method for improving gas permeability of coal bed by adopting air cannon vibration |
| NL2028339A (en) * | 2021-05-31 | 2021-08-23 | North China Inst Science & Tech | An high-efficient gas drainage method for low-permeability coal seam |
| CN113756858A (en) * | 2021-09-30 | 2021-12-07 | 中煤科工集团重庆研究院有限公司 | Directional long-drilling hole distribution method for gas extraction based on dim-light coal layering condition |
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| CN102852506A (en) * | 2012-10-17 | 2013-01-02 | 中国矿业大学 | High-pressure pneumatic blasting pressure relieving and transmission increasing method |
| CN106837406A (en) * | 2016-11-28 | 2017-06-13 | 田成林 | A kind of coal seam with gas multistage anti-reflection method |
| CN108316964A (en) * | 2018-02-01 | 2018-07-24 | 西安科技大学 | A kind of low air permeability coal seam pressure relief gas pumping mining method |
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| CN110939478A (en) * | 2019-12-17 | 2020-03-31 | 华北科技学院 | Method for improving gas permeability of coal bed by adopting air cannon vibration |
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| CN113756858A (en) * | 2021-09-30 | 2021-12-07 | 中煤科工集团重庆研究院有限公司 | Directional long-drilling hole distribution method for gas extraction based on dim-light coal layering condition |
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