CN105114116A - Method for strengthening regional gas extraction through hydro-thermal coupling fracturing - Google Patents
Method for strengthening regional gas extraction through hydro-thermal coupling fracturing Download PDFInfo
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- CN105114116A CN105114116A CN201510458809.3A CN201510458809A CN105114116A CN 105114116 A CN105114116 A CN 105114116A CN 201510458809 A CN201510458809 A CN 201510458809A CN 105114116 A CN105114116 A CN 105114116A
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- 230000008878 coupling Effects 0.000 title claims abstract description 25
- 238000010168 coupling process Methods 0.000 title claims abstract description 25
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000005728 strengthening Methods 0.000 title claims abstract description 15
- 238000000605 extraction Methods 0.000 title claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000003245 coal Substances 0.000 claims abstract description 22
- 238000002347 injection Methods 0.000 claims abstract description 17
- 239000007924 injection Substances 0.000 claims abstract description 17
- 238000001027 hydrothermal synthesis Methods 0.000 claims description 19
- 238000005086 pumping Methods 0.000 claims description 19
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 15
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 15
- 229910052791 calcium Inorganic materials 0.000 claims description 15
- 239000011575 calcium Substances 0.000 claims description 15
- 239000004571 lime Substances 0.000 claims description 15
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 14
- 235000013312 flour Nutrition 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 238000007796 conventional method Methods 0.000 claims description 3
- 230000004044 response Effects 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims 3
- 239000010959 steel Substances 0.000 claims 3
- 230000000694 effects Effects 0.000 abstract description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract 6
- 235000012255 calcium oxide Nutrition 0.000 abstract 3
- 239000000292 calcium oxide Substances 0.000 abstract 3
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 238000010276 construction Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 9
- 238000003795 desorption Methods 0.000 description 8
- 230000009471 action Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
Classifications
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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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- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/2405—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection in association with fracturing or crevice forming processes
-
- 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
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a method for strengthening regional gas extraction through hydro-thermal coupling fracturing. The method comprises steps as follows: firstly, a main fracturing hole, branch fracturing holes and lead holes are sequentially formed in a coal seam roadway through construction, the main fracturing hole is formed in the central position of an equilateral triangle, the opening positions of the branch fracturing holes are distributed at three vertexes of the equilateral triangle separately, the borehole bottom locations of the branch fracturing holes are converged in a center line of the equilateral triangle, the lead holes are located in a circle with the main fracturing hole serving as a center of the circle, and the radius of the circle is 5-15 m; fracturing equipment comprises water injection equipment and a powder injection device, and the water injection comprises an intelligent water tank and a fracturing pump. Quicklime powder in the powder injection device is injected into the main fracturing hole and the branch fracturing holes through underground air pressure; the water injection equipment performs hydraulic fracturing on the main fracturing hole, the quicklime powder is carried by high-pressure water to enter cracks, meanwhile, the quicklime powder and water have a thermal reaction to generate a large amount of heat, and hydro-thermal coupling fracturing is realized; with the implementation of the method for strengthening the regional gas extraction through the hydro-thermal coupling fracturing, the regions influenced by fracturing are increased, the concentration of extracted gas is increased, the effect is remarkable, and demands of work such as regional gas treatment in a coal mine site and the like are met.
Description
Technical field
The present invention relates to a kind of hydrothermal reaction coupling pressure break strengthening region gas pumping method, belong to underground coal mine regional gas control technical field, be particularly useful for the hydrothermal reaction coupling fracturing work at the projecting coal bed middle regional gas control of deep high methane.
Background technology
Chinese Academy of Engineering's " national energy development strategy 2030 ~ 2050 " report proposes the year two thousand fifty coal annual production and controls at 3,000,000,000 tons, and coal is using the long-term leading energy as China.But, China Mine Geological complicated condition, high gas layer accounts for 50%-70%, and high gassy and low permeability coal seam account for wherein about 70%.China's high gassy and low permeability coal seam bearing features is micropore property, low-permeability and high adsorption, cause in recovery process often along with a large amount of Gas, particularly along with the high-efficiency intensifying of coal production and the increase of mining depth, gas emission is increasing, and the threat of gas explosion and Gas Outburst danger is more and more serious.Therefore, colliery often needs to carry out regional gas control operation in recovery process, and hydraulic fracturing technology is one of major measure of oil output, also achieves certain effect in the application of underground coal mine.
But existing coal seam hydraulic fracture technology exists the phenomenons such as technique effect instability, release is insufficient, extraction efficiency is low, not only time-consuming, workload is large, and dangerous high, cost is high.Mainly because traditional hydraulic fracturing technology crack propagation is insufficient, there is no the Fracture Networks of feasible region.And, conventional hydraulic fracturing technique implement after the passage that there is shutoff Gas Flow of moisture, produce the effect suppressing desorption of mash gas, diffusion and infiltration, cause hydraulic fracturing technology to be restricted gradually.Therefore, in order to solve existing hydraulic fracturing technology defect, be badly in need of a kind of novel fracturing technique method, to meet the requirements of one's work such as colliery scene region gas preventing and control.In conjunction with and draw the advantage of existing fracturing, using for reference heats up promotes the thinking of desorption of mash gas, the plugging action of moisture after increase pressure break after gas desorption quantity, minimizing pressure break, utilizes reasonably boring layout generation region Fracture Networks, forms hydrothermal reaction coupling pressure break strengthening gas pumping technical method.
Summary of the invention
Technical problem: the object of the invention is for the weak point in hydraulic fracturing technology existing in high gassy and low permeability coal seam, there is provided a kind of pressure break influence area large, desorption of mash gas amount is large, the hydrothermal reaction coupling pressure break strengthening region gas pumping method that gas pumping successful, success rate are high, cost is low.
Technical scheme:
Hydrothermal reaction coupling pressure break strengthening region of the present invention gas pumping method, is characterized in that comprising the following steps:
A. help to construct successively main pressure break hole and three branch's pressure break holes in lane, coal seam, main pressure break hole is arranged in an equilateral triangle center position, the position of opening in three branch's pressure break holes is arranged in this equilateral leg-of-mutton three summits place, the borehole bottom location in three branch's pressure break holes is met at this equilateral triangle center line place, formed with this equilateral triangle the end of as, with the positive triangular pyramid that branch's pressure break hole is seamed edge, make main pressure break hole, three branch's pressure break holes through in coal seam, the spacing in main pressure break hole and branch's pressure break hole is 2 ~ 3m;
B. construct in the 5 ~ 15m position apart from main pressure break hole four bullports, make four bullports be in main pressure break hole for the center of circle, radius is on the circle of 5 ~ 15m;
C. connect fracturing unit in aperture, main pressure break hole, described fracturing unit comprises the water injection equipment that is made up of intelligent water tank, fracturing pump and note powder device forms.The outlet pipe of water injection equipment and the flour extraction pipe of note powder device are linked together by threeway, and the outlet of threeway is connected with pressure break pipe through high-pressure rubber pipe, and the outlet pipe of water injection equipment, the flour extraction pipe of note powder device are respectively equipped with one way valve;
D. conventional method for sealing is adopted to carry out borehole sealing to main pressure break hole, branch's pressure break hole and bullport successively;
E. in note powder device, add a certain amount of calcium lime powder, by down-hole blast, the calcium lime powder in note powder device is injected main pressure break hole, when the whole powder delivery in all branch's pressure break holes, stop note powder;
F. fracturing pump is opened, carry out fracturing by water injection equipment to main pressure break hole, around main pressure break hole and branch's pressure break hole, produce crack, calcium lime powder enters crack under the carrying of water under high pressure, calcium lime powder and moisture generation thermal response generate a large amount of heat simultaneously, realize hydrothermal reaction coupling pressure break;
G. repeat step e, f, when four bullports all occur that water flows out, stop hydrothermal reaction coupling pressure break, remove fracturing unit, main pressure break hole, branch's pressure break hole and bullport are linked gas pumping pipe network, carries out gas pumping.
Beneficial effect: owing to have employed technique scheme, solves existing hydraulic fracturing technology defect, achieves coal seam water thermal coupling pressure break, promotes that coal body internal crack is grown, expansion and through, and pressure break influence area increases; Temperature raises the desorption of mash gas, the increase pressure break after gas desorption quantity that facilitate high adsorption; Moisture and calcium lime powder react, and moisture reduces, the plugging action of moisture after minimizing pressure break.By implementing hydrothermal reaction coupling pressure break strengthening region gas pumping method, mash gas extraction concentration increases, and cost is low, Be very effective, meets the requirements of one's work such as colliery scene regional gas control.
Accompanying drawing explanation
Fig. 1 is hydrothermal reaction coupling pressure break strengthening region of the present invention gas pumping method borehole pattern.
Fig. 2 is hydrothermal reaction coupling pressure break strengthening region of the present invention gas pumping method embodiment schematic diagram.
In figure: 1-lane is helped, 2-main pressure break hole, 3-branch pressure break hole, 4-bullport, 5-intelligent water tank, 6-fracturing pump, 7-high-pressure rubber pipe, 8-1-one way valve, 8-2-one way valve, 9-valve, 10-threeway, 11-pressure break pipe, 12-note powder device, 13-calcium lime powder, 14-crack.
Detailed description of the invention:
Below in conjunction with accompanying drawing, the specific embodiment of the invention is further described:
Shown in Fig. 1 and Fig. 2, a kind of hydrothermal reaction coupling pressure break strengthening region gas pumping method: first, help to construct successively on 1 main pressure break hole 2 and three branch's pressure break holes 3 in lane, coal seam, main pressure break hole 2 is arranged in an equilateral triangle center position, the position of opening in three branch's pressure break holes 3 is arranged in this equilateral leg-of-mutton three summits place, the borehole bottom location in three branch's pressure break holes 3 is met at this equilateral triangle center line place, formed with this equilateral triangle the end of as, with the positive triangular pyramid that branch's pressure break hole 3 is seamed edge, make main pressure break hole 2, three branch's pressure break holes 3 are through in coal seam, main pressure break hole 2 is 2 ~ 3m with the perforate spacing in branch's pressure break hole 3, construct in the 5 ~ 15m position apart from main pressure break hole 2 four bullports 4, make four bullports 4 be in main pressure break hole 2 for the center of circle, radius is on the circle of 5 ~ 15m, connect fracturing unit in aperture, main pressure break hole 2, described fracturing unit comprises the water injection equipment that is made up of intelligent water tank 5, fracturing pump 6 and note powder device 12 forms.The outlet pipe of water injection equipment and the flour extraction pipe of note powder device are linked together by threeway 10, and the outlet of threeway 10 is connected with pressure break pipe 11 through high-pressure rubber pipe 7, and the outlet pipe of water injection equipment, the flour extraction pipe of note powder device 12 are respectively equipped with one way valve 8-1 and one way valve 8-2; Conventional method for sealing is adopted to carry out borehole sealing to main pressure break hole 2, branch's pressure break hole 3 and bullport 4 successively; In note powder device 12, add a certain amount of calcium lime powder 13, by down-hole blast, the calcium lime powder 13 in note powder device 12 is injected main pressure break hole 2, when all branch's pressure break hole 3 whole powder delivery, stop note powder; Open fracturing pump 6, by water injection equipment, fracturing is carried out to main pressure break hole 2, crack 14 is produced around main pressure break hole 2 and branch's pressure break hole 3, calcium lime powder 13 enters crack 14 under the carrying of water under high pressure, calcium lime powder 13 and moisture generation thermal response generate a large amount of heat simultaneously, realize hydrothermal reaction coupling pressure break, temperature raises the desorption of mash gas, the increase pressure break after gas desorption quantity that facilitate high adsorption; Moisture and calcium lime powder react, and moisture reduces, the plugging action of moisture after minimizing pressure break; When four bullports 4 all occur that water flows out, stop hydrothermal reaction coupling pressure break, remove fracturing unit, main pressure break hole 2, branch's pressure break hole 3 and bullport 4 are linked gas pumping pipe network, carries out gas pumping.By implementing hydrothermal reaction coupling pressure break strengthening region gas pumping method, solve existing hydraulic fracturing technology defect, achieve coal seam water thermal coupling pressure break, promote that coal body internal crack is grown, expansion and through, mash gas extraction concentration increases, cost is low, Be very effective, meets the requirements of one's work such as colliery scene regional gas control.
Claims (2)
1. a hydrothermal reaction coupling pressure break strengthening region gas pumping method, is characterized in that comprising the following steps:
A. to construct successively main pressure break hole (2) and three branch's pressure break holes (3) in lane, coal seam side (1), main pressure break hole (2) is arranged in an equilateral triangle center position, the position of opening of three branch's pressure break holes (3) is arranged in this equilateral leg-of-mutton three summits place, the borehole bottom location of three branch's pressure break holes (3) is met at this equilateral triangle center line place, make main pressure break hole (2), three branch's pressure break holes (3) through in coal seam, main pressure break hole (2) is 2 ~ 3m with the spacing in branch's pressure break hole (3);
B. four bullports (4) of constructing apart from 5 ~ 15m position, main pressure break hole (2), four bullports (4) are in main pressure break hole (2) for the center of circle, and radius is on the circle of 5 ~ 15m;
C. connect fracturing unit in main pressure break hole (2) aperture, described fracturing unit comprises the water injection equipment be made up of intelligent water tank (5), fracturing pump (6) and forms with note powder device (12).The outlet pipe of water injection equipment and the flour extraction pipe of note powder device are linked together by threeway (10), the outlet of threeway (10) is connected with pressure break pipe (11) through high-pressure rubber pipe (7), and the outlet pipe of water injection equipment, the flour extraction pipe of note powder device (12) are respectively equipped with one way valve (8-1) and one way valve (8-2);
D. conventional method for sealing is adopted to carry out borehole sealing to main pressure break hole (2), branch's pressure break hole (3) and bullport (4) successively;
E. in note powder device (12), a certain amount of calcium lime powder (13) is added, by down-hole blast, the calcium lime powder (13) noted in powder device (12) is injected main pressure break hole (2), when the whole powder delivery of all branch's pressure break holes (3), stop note powder;
F. fracturing pump (6) is opened, by water injection equipment, fracturing is carried out to main pressure break hole (2), crack (14) is produced around main pressure break hole (2) and branch's pressure break hole (3), calcium lime powder (13) enters crack (14) under the carrying of water under high pressure, calcium lime powder (13) and moisture generation thermal response generate a large amount of heat simultaneously, realize hydrothermal reaction coupling pressure break;
G. step e, f is repeated, when four bullports (4) all occur that water flows out, stop hydrothermal reaction coupling pressure break, remove fracturing unit, main pressure break hole (2), branch's pressure break hole (3) and bullport (4) are linked gas pumping pipe network, carries out gas pumping.
2. hydrothermal reaction coupling pressure break strengthening region according to claim 1 gas pumping method, it is characterized in that: pressure break pipe (11) is the seamless steel pipe of even tube wall layout aperture, hole diameter is 10mm, and seamless steel pipe diameter is 25mm, and seamless steel pipe total length is 30m.
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| CN201510458809.3A CN105114116B (en) | 2015-07-30 | 2015-07-30 | A kind of hydrothermal reaction coupling pressure break strengthening region gas pumping method |
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| CN105114116B CN105114116B (en) | 2018-01-05 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105484720A (en) * | 2015-12-29 | 2016-04-13 | 中国矿业大学 | Microwave-assisted extraction and hydrofracture cooperative coal seam anti-reflection method |
| CN105525901A (en) * | 2015-12-29 | 2016-04-27 | 中国矿业大学 | Coal seam hydrofracture strengthening permeability increasing method based on microwave irradiation |
| CN105673067A (en) * | 2016-03-07 | 2016-06-15 | 中国矿业大学 | Hydraulic fracture and microwave radiation combined coal bed gas enhanced extraction device and method |
| CN107842350A (en) * | 2017-11-07 | 2018-03-27 | 河南理工大学 | A kind of method that extraction rate is improved in high gas remainder quantity coal seam of underground coal mine |
| CN107975359A (en) * | 2017-11-23 | 2018-05-01 | 山东科技大学 | A kind of anti-disaster method of coal-bed flooding based on seawater corrosion |
| CN108643878A (en) * | 2018-04-13 | 2018-10-12 | 山东科技大学 | A kind of high temperature disturbance reinforcing acidification fracture zone gas pumping method |
| CN108708765A (en) * | 2018-04-13 | 2018-10-26 | 山东科技大学 | One kind strengthening acid fracturing coal uncovering method based on high temperature disturbance |
| CN110067548A (en) * | 2019-06-10 | 2019-07-30 | 河南理工大学 | A kind of underground coal mine high temperature hydraulic fracturing anti-reflection method and its system |
| CN113738435A (en) * | 2021-09-10 | 2021-12-03 | 湘潭大学 | Enhanced permeability-increasing extraction method for deep low-permeability high-gas coal seam area |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105525901A (en) * | 2015-12-29 | 2016-04-27 | 中国矿业大学 | Coal seam hydrofracture strengthening permeability increasing method based on microwave irradiation |
| CN105484720B (en) * | 2015-12-29 | 2017-10-24 | 中国矿业大学 | The coal seam anti-reflection method that a kind of On Microwave-assisted Extraction is mutually cooperateed with hydraulic fracturing |
| CN105525901B (en) * | 2015-12-29 | 2017-10-24 | 中国矿业大学 | A kind of coal seam hydraulic fracture reinforcing anti-reflection method based on microwave irradiation |
| CN105484720A (en) * | 2015-12-29 | 2016-04-13 | 中国矿业大学 | Microwave-assisted extraction and hydrofracture cooperative coal seam anti-reflection method |
| CN105673067A (en) * | 2016-03-07 | 2016-06-15 | 中国矿业大学 | Hydraulic fracture and microwave radiation combined coal bed gas enhanced extraction device and method |
| CN105673067B (en) * | 2016-03-07 | 2018-02-13 | 中国矿业大学 | A kind of hydraulic fracturing and the device and method of the combined reinforced draining coal seam gas of microwave radiation |
| CN107842350B (en) * | 2017-11-07 | 2019-08-02 | 河南理工大学 | A kind of method that extraction rate is improved in the high gas remainder quantity coal seam of underground coal mine |
| CN107842350A (en) * | 2017-11-07 | 2018-03-27 | 河南理工大学 | A kind of method that extraction rate is improved in high gas remainder quantity coal seam of underground coal mine |
| CN107975359A (en) * | 2017-11-23 | 2018-05-01 | 山东科技大学 | A kind of anti-disaster method of coal-bed flooding based on seawater corrosion |
| CN107975359B (en) * | 2017-11-23 | 2019-12-03 | 山东科技大学 | A kind of anti-disaster method of coal-bed flooding based on seawater corrosion |
| CN108643878A (en) * | 2018-04-13 | 2018-10-12 | 山东科技大学 | A kind of high temperature disturbance reinforcing acidification fracture zone gas pumping method |
| CN108708765B (en) * | 2018-04-13 | 2019-09-06 | 山东科技大学 | One kind strengthening acid fracturing coal uncovering method based on high temperature disturbance |
| CN108708765A (en) * | 2018-04-13 | 2018-10-26 | 山东科技大学 | One kind strengthening acid fracturing coal uncovering method based on high temperature disturbance |
| CN108643878B (en) * | 2018-04-13 | 2020-03-10 | 山东科技大学 | High-temperature disturbance strengthened acidizing and fracturing area gas extraction method |
| CN110067548A (en) * | 2019-06-10 | 2019-07-30 | 河南理工大学 | A kind of underground coal mine high temperature hydraulic fracturing anti-reflection method and its system |
| CN113738435A (en) * | 2021-09-10 | 2021-12-03 | 湘潭大学 | Enhanced permeability-increasing extraction method for deep low-permeability high-gas coal seam area |
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