CN107916953A - Gas drainage system, pumping method and construction technology based on roof horizontal drilling - Google Patents
Gas drainage system, pumping method and construction technology based on roof horizontal drilling Download PDFInfo
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- CN107916953A CN107916953A CN201711194506.0A CN201711194506A CN107916953A CN 107916953 A CN107916953 A CN 107916953A CN 201711194506 A CN201711194506 A CN 201711194506A CN 107916953 A CN107916953 A CN 107916953A
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- 238000005553 drilling Methods 0.000 title claims abstract description 96
- 238000010276 construction Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000005516 engineering process Methods 0.000 title claims abstract description 13
- 238000005086 pumping Methods 0.000 title claims abstract description 12
- 239000003245 coal Substances 0.000 claims abstract description 21
- 238000000605 extraction Methods 0.000 claims abstract description 20
- 238000007789 sealing Methods 0.000 claims abstract description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 22
- 238000005065 mining Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 239000004047 hole gas Substances 0.000 claims description 8
- 239000011435 rock Substances 0.000 claims description 8
- 239000004568 cement Substances 0.000 claims description 5
- 238000003032 molecular docking Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 241001074085 Scophthalmus aquosus Species 0.000 claims 1
- 239000007787 solid Substances 0.000 claims 1
- 208000019901 Anxiety disease Diseases 0.000 description 4
- 230000036506 anxiety Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000000505 pernicious effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- E21F16/00—Drainage
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a kind of gas drainage system based on roof horizontal drilling,Pumping method and construction technology,Including positioned at cutting eye and stop adopting the horizontal drilling between line,Horizontal drilling is arranged in roof,Horizontal drilling is higher than to be located at positioned at the one end for cutting eye to stop adopting one end of line,And horizontal drilling is located at one end sealing for cutting eye,The horizontal drilling other end is connected by the input terminal of opposite bore and moisture trap,Ground L-type horizontally-butted wells mash gas extraction technology,Relative to coal mine operation environment,Ground drill site is open,The type selecting scope of drilling equipment is wide,High-power drilling equipment can be used,Drillng operation it is efficient,And the km level above well that can construct out,Heavy caliber wellhole,Extraction is efficient,The orientation of drilling can be accurately controlled at the same time,Angle,The parameters such as hole deviation,Ensure coal seam Drilling ratio,And track can be changed as coal seam changes,Be conducive to gasresolution.
Description
Technical field
The invention belongs to coal mine gas extraction technical field, and in particular to a kind of based on roof horizontal drilling
Gas drainage system, pumping method and construction technology.
Background technology
At present, highly gassy mine uses high-order lane to draw out methane to solve the problems such as gas at upper corner transfinites, and coal seam is opened
The movement of overlying rock and disrumpent feelings will be caused after adopting, so as to form mining induced fissure in overlying strata.Mining induced fissure can be divided by property
For 2 classes, one kind is bedseparated fissures, be with rock depression occur between the layers along bedding fissure, it is swollen that it produces coal seam
Bulging deformation and make gas release, and gas pressure relief is gushed out along bedseparated fissures；Another kind of is vertical disrumpent feelings crack, is with rock stratum
Slabbing gap is worn in heavy disrumpent feelings formation, and the passage of gas between upper and lower rock stratum has been linked up in this kind of crack, after back production top plate is fully caving,
The gas that goaf difference gushes out source rises under buoyancy along mining induced fissure passage, is finally collected in fissure zone, is formed
Gas accumulation area；Currently used gas pumping method is suction road, but suction road construction work amount it is big, it is long in time limit, costly,
Deslagging is difficult and coal seam easy to pollute.
The content of the invention
To solve problems of the prior art, the object of the present invention is to provide one kind to be based on roof horizontal drilling
Gas drainage system, pumping method and construction technology, gas at upper corner overrun issues can be solved, while there is quantities
Small, expense is low and the advantages of short time limit.
To achieve these goals, the technical solution adopted by the present invention is：Gas based on roof horizontal drilling is taken out
Extraction system, including positioned at cutting eye and stopping adopting the horizontal drilling between line, horizontal drilling is arranged in roof, horizontal drilling position
It is higher than to be located in the one end for cutting eye and stops adopting one end of line, and horizontal drilling is located at one end sealing for cutting eye, the horizontal drilling other end
Connected by the input terminal of opposite bore and moisture trap.
The output terminal of moisture trap connects down-hole gas sucking releasing pipeline and drainage underground pipeline respectively.
Tripping in has a screen casing in horizontal drilling, in opposite bore tripping in have steel sleeve.
Opposite bore end and horizontal drilling are docked and connected stopping adopting at line, aperture installation moisture trap.
Horizontal drilling is located on the inside of air return lane in the fissure zone of the roof of 20~30m, horizontal drilling and horizontal plane it
Between angle α be 1~3 °.
Down-hole gas sucking releasing pipeline and drainage underground pipeline are mounted on the flowmeter for measuring extraction amount.
Present invention also offers the gas pumping method based on roof horizontal drilling, in working face mining process,
Poured on methane gas in target coal seam in horizontal drilling, since horizontal drilling is downdip direction, horizontal drilling, which is located at, to be cut
One end of eye is higher than positioned at stopping adopting one end of line, and the gas and mining water in wellhole enter underground docking and bores under the effect of gravity
Hole, and through gas and water separator by methane gas and the separation of mining water by down-hole gas sucking releasing pipeline and drainage underground pipeline into
Row conveying.
Present invention also offers the construction technology of the gas drainage system based on roof horizontal drilling, implements on ground
L-type horizontal well, the well horizontal segment drilling direction be located at coal seam top crack belt position to cut eye to stopping adopting line direction, horizontal segment,
Opposite bore is constructed before L-type horizontal well three is opened, and rear three, which open horizontal segment end, is mated with, finishing drilling；After drilling engineering
Moisture trap is installed in underground opposite bore aperture.
Specifically include following steps：
Step S1, one open：Basement rock is pierced using Φ 311.1mm drill bits and is no less than 10m finishing drillings, rear tripping in Φ 244.5mm steel
Level is the surface pipe of J55 and returns to ground with well cementing of cement, cementing concrete；
Step S2, two open：Constructed using Φ 215.9mm drill bits to landing point finishing drilling, and tripping in Φ 177.8mm protective casings
After cement the well, the anti-up to ground of cementing concrete, completes Erkaijing well；
Step S3, three open：Horizontal segment drilling construction and tripping in Φ 89.00m screen casings are completed using Φ 152.00mm drill bits, it is complete
Into three spud sections；
Step S4, L-type well horizontal drilling and opposite bore are completed to dock stopping adopting at line；
Step S5, moisture trap is installed in underground opposite bore aperture after drilling engineering.
Shunt in a well in the horizontal segment of L-type horizontal well positioned at a position tripping in bridge plug is cut；Opposite bore opens it in L-type horizontal well three
Before start after construction three and open and be mated with, and tripping in N80 steel sleeves in opposite bore.
Compared with prior art, the present invention has the following effects that, ground L-type horizontally-butted wells mash gas extraction technology, relatively
In coal mine operation environment, ground drill site is open, and the type selecting scope of drilling equipment is wide, can use high-power drilling equipment,
Drillng operation it is efficient；The km level above that can construct out well, heavy caliber wellhole, extraction are efficient；Can accurately it control
The parameters such as the orientation of drilling, angle, hole deviation, it is ensured that coal seam Drilling ratio, and track can be changed as coal seam changes, be conducive to watt
This parsing.
L-type butt shaft in ground using the present invention substitutes suction road mash gas extraction, reduces tunnelling amount, takes reducing
With while avoid the danger that the only head of suction road tunnels, underground drill site is arranged near mining roadway, can prepare lane with working face
Road parallel operations, can effectively solve the problems, such as that coal mine excavation takes over anxiety.
Ground L-type horizontal well is completed after connecting with underground gas extraction drilling, can be carried out by the existing extraction system in underground
Negative pressure extraction, efficiently solves the deficiency of ground positive pressure extraction；Methane concentration is high in the methane gas of extraction, generally 60% with
On, there is important commercial value；To sum up, L-type horizontally-butted wells in ground draw out methane technology, and construction technology is feasible, safely may be used
OK, economically feasible, has preferable market popularization value.
It is proposed by the present invention to implement ground " L " type butt shaft to substitute suction road engineering test in highly gassy mine to be to be necessary
, it is of great significance to safety of coal mines, efficient digging, and a kind of new way of gas is administered in mining area.This technology is answered
With and carry out, can not only alleviate face take-over anxiety, prevent the coal seam pollution problem brought in suction road tunneling process, drop
Low production cost, and can be by gas at upper corner concentration control during working face extraction in safe range, while coal can be improved
Charcoal resource recovery, is utilized gas, turns waste into wealth, and turns bane into boon, after this show-how success, in national high methane
Promoted with projecting mine, will have to control of coalmine gas and be of great significance.
Brief description of the drawings
Fig. 1 is the structure diagram of the present invention.
In attached drawing：11st, horizontal drilling, 12, vertical drilling hole, 13, moisture trap, 14, drainage underground pipeline, 15, underground
Gas drainage pipeline, 16, opposite bore, 21, fissure zone, 22, caving zone, 23, coal seam.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and detailed description.
As shown in Figure 1, the gas drainage system based on roof horizontal drilling, including be arranged on cut eye and stopping adopt line it
Between horizontal drilling 11, roof includes caving zone 22 and fissure zone 21, and horizontal drilling 11 is located at 20~30m on the inside of air return lane
Roof fissure zone in, horizontal drilling 11, which is located at, to be cut one end of eye and is higher than positioned at stopping adopting one end of line, and horizontal drilling
11 positioned at one end sealing for cutting eye, and the angle α between horizontal drilling 11 and horizontal plane is 1~3 °；
11 other end of horizontal drilling is connected by opposite bore 16 with the input terminal of moisture trap 13, in horizontal drilling 11
It is provided with screen casing, tripping in steel sleeve in opposite bore 16, the output terminal of moisture trap 13 is connected to down-hole gas sucking releasing
Pipeline 15 and drainage underground pipeline 14.
In a preferred embodiment of the invention, down-hole gas sucking releasing pipeline 15 and drainage underground pipeline 14 are mounted on being used for
Measure the flowmeter of extraction amount.
The invention also provides a kind of gas pumping method based on roof horizontal drilling, in working face mining process
In, poured on the methane gas in target coal seam in horizontal drilling 11, since horizontal drilling 11 is downdip direction, horizontal drilling
11 are higher than positioned at stopping adopting one end of line positioned at the one end for cutting eye, and the gas and mining water in pit shaft enter underground under the effect of gravity
Opposite bore 16, and methane gas and the separation of mining water are passed through into down-hole gas sucking releasing pipeline 15 and underground through gas and water separator
Discharge pipe line 14 is conveyed.
The invention also provides a kind of construction technology of the gas drainage system based on roof horizontal drilling, first,
Implement L-type horizontal well on ground, which be located at the top of coal seam 23 to cut eye to stopping adopting line direction, horizontal segment
Crack belt position, underground opposite bore 16 start to construct before L-type horizontal well three is opened, and rear three to open horizontal segment end right therewith
Connect, moisture trap 13 is installed in underground opposite bore aperture after drilling engineering, specifically includes following steps：
Step S1, one open：Basement rock is pierced using Φ 311.1mm drill bits and is no less than 10m finishing drillings, rear tripping in Φ 244.5mm steel
Level is the surface pipe of J55 and returns to ground with well cementing of cement, cementing concrete；
Step S2, two open：Constructed using Φ 215.9mm drill bits to landing point finishing drilling, and tripping in Φ 177.8mm protective casings
After cement the well, the anti-up to ground of cementing concrete, completes Erkaijing well；
Step S3, three open：Horizontal segment drilling construction and tripping in Φ 89.00m screen casings are completed using Φ 152.00mm drill bits, it is complete
Into three spud sections；
Step S4, L-type well horizontal drilling and opposite bore are completed to dock stopping adopting at line；Opposite bore is in L-type horizontal well
Three open before start after construction three and open and be mated with, and tripping in N80 steel sleeves in opposite bore.
Step S5, moisture trap is installed in underground opposite bore well head after drilling engineering.
Shunt in a well in the horizontal segment of L-type horizontal well positioned at a position tripping in bridge plug is cut.
In the gas pumping method based on ground L-type butt shaft of the present invention, underground drill site construction selection adjoining rock stability portion
Position, supporting and the supporting in tunnel requirement are consistent, and drill site width is not less than 6m, and depth is not less than 5m, highly not less than 4.5m.Drill site
Parameter should be constructed and bore according to drilling machine model and the concrete condition adjustment of drilling actual angle depending on parameters such as drilling machine model and runs of steel
, sector is tunneled with drilling construction technical staff and accomplishes fluently fixed drilling machine anchor pole, and with one interim sump of pick, is equipped with corresponding
Water pump and pipeline, by hole position by design parameter put a little, drill site carry out location position.
After the opposite bore construction of underground, gas pumping device is installed in aperture, and moisture trap is installed, underground pair
Connect drainage holes to access in mine extraction system by gas pumping device, carry out underground and concentrate extraction, pass through flowmeter metering watt
This extraction amount.
The horizontal segment of L-type well of the present invention need to consider that eyelet is integrally inclined to, overall near horizontal, be slightly declined, docked in underground
Drilling orifice installs blowout hookup, prevents from when underground from docking that instantaneously there are a large amount of mud fluids and pernicious gas to pour in main entry,
Ensure that docking operation carries out safely.
Construction efficiency contrasts, and in the planning of a certain embodiment of the present invention, suction road is needed before working face arranges tunnel
Take the lead in constructing, with the safety of the tunnelling of safeguard work face and back production, according to the actual conditions of working face, suction road needs to tunnel altogether
Tunnel 1.82km, needs man-hour 10 months, can be penetrated through than working face open-off cut eye late probably 3-4 months, bring the situation for taking over anxiety.Such as
Fruit applies ground L-type butt shaft, it is only necessary to 2 to 3 months, avoids the situation of excavation replacement anxiety.
Claims (10)
1. the gas drainage system based on roof horizontal drilling, it is characterised in that including positioned at cutting between eye and stopping adopts line
Horizontal drilling (11), horizontal drilling (11) is arranged in roof, and horizontal drilling (11), which is located at, to be cut one end of eye and be higher than position
In the one end for stopping adopting line, and horizontal drilling (11) is located at one end sealing for cutting eye, and horizontal drilling (11) other end, which passes through to dock, to be bored
Hole (16) is connected with the input terminal of moisture trap (13).
2. the gas drainage system according to claim 1 based on roof horizontal drilling, it is characterised in that air water point
Output terminal from device (13) is connected to down-hole gas sucking releasing pipeline (15) and drainage underground pipeline (14).
3. the gas drainage system according to claim 1 based on roof horizontal drilling, it is characterised in that level is bored
Tripping in has screen casing in hole (11), and opposite bore (16) interior tripping in has steel sleeve.
4. the gas drainage system according to claim 1 based on roof horizontal drilling, it is characterised in that docking is bored
Hole (16) end and horizontal drilling (11) are docked and connected stopping adopting at line, aperture installation moisture trap (13).
5. the gas drainage system according to claim 1 based on roof horizontal drilling, it is characterised in that level is bored
Hole (11) is located on the inside of air return lane in the fissure zone of the roof of 20~30m, folder of the horizontal drilling (11) between horizontal plane
Angle α is 1~3 °.
6. the gas drainage system according to claim 1 based on roof horizontal drilling, it is characterised in that underground watt
This extraction pipeline (15) and drainage underground pipeline (14) are mounted on the flowmeter for measuring extraction amount.
7. the gas pumping method based on roof horizontal drilling, it is characterised in that in working face mining process, target coal
Poured on methane gas in layer into horizontal drilling (11), since horizontal drilling (11) is downdip direction, horizontal drilling (11)
It is higher than positioned at the one end for cutting eye positioned at stopping adopting one end of line, the gas and mining water in pit shaft enter underground pair under the effect of gravity
Drilling (16) is connect, and methane gas and the separation of mining water are passed through into down-hole gas sucking releasing pipeline (15) and well through gas and water separator
Lower discharge pipe line (14) is conveyed.
8. the construction technology of the gas drainage system based on roof horizontal drilling, it is characterised in that in ground construction L-type water
Horizontal well, the well horizontal segment drilling direction be located at crack belt position at the top of coal seam, docking brill to cut eye to stopping adopting line direction, horizontal segment
Hole (16) is constructed before L-type horizontal well three is opened, and rear three, which open horizontal segment end, is mated with, in underground pair after drilling engineering
Connect drilling (16) aperture installation moisture trap (13).
9. construction technology according to claim 8, it is characterised in that specifically include following steps：
Step S1, one open：Basement rock is pierced using Φ 311.1mm drill bits and is no less than 10m finishing drillings, rear tripping in Φ 244.5mm grade of steels are
The surface pipe of J55 simultaneously returns to ground with well cementing of cement, cementing concrete；
Step S2, two open：Constructed using Φ 215.9mm drill bits to landing point finishing drilling, and it is solid after tripping in Φ 177.8mm protective casings
Well, the anti-up to ground of cementing concrete, completes Erkaijing well；
Step S3, three open：Horizontal segment drilling construction and tripping in Φ 89.00m screen casings are completed using Φ 152.00mm drill bits, complete three
Spud section；
Step S4, L-type well horizontal drilling (11) and opposite bore are completed to dock stopping adopting at line；
Step S5, in underground opposite bore aperture installation moisture trap (13) after drilling engineering.
10. construction technology according to claim 8, it is characterised in that be located in the horizontal segment of L-type horizontal well and cut a position
Tripping in bridge plug is shunt in a well；Opposite bore three is opened and is mated with after construction is started before L-type horizontal well three is opened, and in opposite bore under
Enter N80 steel sleeves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711194506.0A CN107916953A (en) | 2017-11-24 | 2017-11-24 | Gas drainage system, pumping method and construction technology based on roof horizontal drilling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711194506.0A CN107916953A (en) | 2017-11-24 | 2017-11-24 | Gas drainage system, pumping method and construction technology based on roof horizontal drilling |
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| CN107916953A true CN107916953A (en) | 2018-04-17 |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107956467A (en) * | 2017-11-20 | 2018-04-24 | 中国矿业大学(北京) | A kind of high seam pre-draining borehole parameter optimization and the method for extracting result assessment |
| CN109519211A (en) * | 2019-01-15 | 2019-03-26 | 中煤科工集团重庆研究院有限公司 | Method for extracting gas in mining area by using pre-extraction coal bed gas ground well |
| CN109538282A (en) * | 2018-09-28 | 2019-03-29 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of coal bed gas adopts L-type well horizontal segment layer position preferred method |
| CN109973140A (en) * | 2019-04-11 | 2019-07-05 | 河南理工大学 | A kind of first mining height effect gas pumping method of high prominent mine large-mining-height working surface |
| CN110067592A (en) * | 2019-03-25 | 2019-07-30 | 大同煤矿集团有限责任公司 | Top plate gas cooperative control method based on tight roof ground fracturing |
| CN110173240A (en) * | 2019-06-19 | 2019-08-27 | 陕西浩兴坤达新能源科技有限公司 | A kind of coal mine gas drainage method |
| CN110306961A (en) * | 2019-06-19 | 2019-10-08 | 陕西浩兴坤达新能源科技有限公司 | It is a kind of along roof Floor water horizontal well drilling well staged fracturing method |
| CN110374497A (en) * | 2019-08-29 | 2019-10-25 | 田振林 | A kind of drilling equipment and its boring method in fire damp hole |
| CN110578505A (en) * | 2019-07-23 | 2019-12-17 | 重庆大学 | Drilling deslagging and hydraulic oscillation fracturing reinforced gas extraction system and method based on nano fluid |
| CN110656941A (en) * | 2019-10-31 | 2020-01-07 | 中煤科工集团重庆研究院有限公司 | Design method and construction process of man-shaped ground well in coal mining area |
| CN111022109A (en) * | 2019-12-24 | 2020-04-17 | 山西晋城无烟煤矿业集团有限责任公司 | Method for extracting gas in closed goaf |
| CN112012785A (en) * | 2020-09-11 | 2020-12-01 | 中国矿业大学 | Method for extracting pressure-relief gas by utilizing L-shaped drilling in overburden rock isolation grouting filling process |
| CN112145224A (en) * | 2020-10-26 | 2020-12-29 | 山西晋城无烟煤矿业集团有限责任公司 | Mining area coal seam roof multi-branch horizontal well construction method |
| CN112761704A (en) * | 2021-02-05 | 2021-05-07 | 中煤科工集团西安研究院有限公司 | Ground horizontal well dust removal method and device for coal mine roadway driving working face |
| CN113669004A (en) * | 2021-08-11 | 2021-11-19 | 中国煤炭地质总局水文地质局 | Coal bed gas control method |
| CN116084890A (en) * | 2023-02-20 | 2023-05-09 | 中煤科工西安研究院(集团)有限公司 | Gas extraction method for declined horizontal well and declined horizontal well |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107956467A (en) * | 2017-11-20 | 2018-04-24 | 中国矿业大学(北京) | A kind of high seam pre-draining borehole parameter optimization and the method for extracting result assessment |
| CN109538282A (en) * | 2018-09-28 | 2019-03-29 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of coal bed gas adopts L-type well horizontal segment layer position preferred method |
| CN109519211A (en) * | 2019-01-15 | 2019-03-26 | 中煤科工集团重庆研究院有限公司 | Method for extracting gas in mining area by using pre-extraction coal bed gas ground well |
| CN110067592A (en) * | 2019-03-25 | 2019-07-30 | 大同煤矿集团有限责任公司 | Top plate gas cooperative control method based on tight roof ground fracturing |
| CN110067592B (en) * | 2019-03-25 | 2021-04-09 | 晋能控股煤业集团有限公司 | Roof gas cooperative control method based on hard roof ground fracturing |
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Application publication date: 20180417 |