CN104314606A - Hydraulic cutting and gas explosion combined enhancing extraction method for fracturing coal body in drill hole - Google Patents
Hydraulic cutting and gas explosion combined enhancing extraction method for fracturing coal body in drill hole Download PDFInfo
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- CN104314606A CN104314606A CN201410405133.7A CN201410405133A CN104314606A CN 104314606 A CN104314606 A CN 104314606A CN 201410405133 A CN201410405133 A CN 201410405133A CN 104314606 A CN104314606 A CN 104314606A
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- 239000003245 coal Substances 0.000 title claims abstract description 47
- 238000004880 explosion Methods 0.000 title claims abstract description 22
- 238000005520 cutting process Methods 0.000 title claims abstract description 7
- 238000000605 extraction Methods 0.000 title abstract description 16
- 230000002708 enhancing effect Effects 0.000 title abstract 4
- 239000002360 explosive Substances 0.000 claims abstract description 51
- 238000005086 pumping Methods 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 24
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 238000007689 inspection Methods 0.000 claims description 6
- 238000007569 slipcasting Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 4
- 241001074085 Scophthalmus aquosus Species 0.000 claims description 3
- 239000011440 grout Substances 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 7
- 230000035699 permeability Effects 0.000 abstract description 6
- 238000003795 desorption Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000035939 shock Effects 0.000 abstract description 3
- 238000001179 sorption measurement Methods 0.000 abstract description 3
- 230000001965 increasing effect Effects 0.000 abstract 2
- 239000007789 gas Substances 0.000 description 62
- 238000005728 strengthening Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004047 hole gas Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000505 pernicious effect Effects 0.000 description 1
- 238000005381 potential energy 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
-
- 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
- E21B43/243—Combustion in situ
- E21B43/247—Combustion in situ in association with fracturing processes 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
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention discloses a hydraulic cutting and gas explosion combined enhancing extraction method for fracturing a coal body in a drill hole. The hydraulic cutting and gas explosion combined enhancing extraction method is suitable for high-efficiency extraction of underground gas of a coal mine. The enhanced extraction method comprises the following steps: firstly, forming a slot by using a hydraulic cutting technology, relieving the pressure and increasing permeability, and desorbing and gushing gas; secondly, pressing air into a sealed drill hole by using an air pump, wherein the air and the gushed gas from the drill hole form gas mixed gas with the concentration of 9-10 percent; detonating the mixed gas by an ignition device to form an explosive shock wave; fracturing the coal body under the guiding action of the slot. The slot provides a greater explosion space, so that the power of explosion is enhanced and a fracture network in the coal body can be fully constructed; besides, the adsorption potential of gas can be remarkably reduced and the desorption and the flowing of the gas are promoted by the heat effect generated by explosion, so that the aim of enhancing the gas extraction of a coal bed with high-concentration gas and low permeability is achieved. The enhanced extraction method has the advantages of safety, reliability, low cost, simplicity, feasibility, time conservation and force conservation; the influence range of effective pressure relief of single holes can be remarkably widened, and the extraction rate of the gas in the coal bed is increased by over 80 percent.
Description
Technical field
The present invention relates to hydraulic slotted liner technique and the combined reinforced pumping method of gas explosion fracturing coal body in a kind of boring, be particularly useful for the efficient extraction of gas of underground coal mine high gassy and low permeability coal seam.
Background technology
The fundamental means that China's coal-mine fire damp is administered is the gas pumping measure based on drilling gas extraction way.Along with China's coal-mine enters deep mining, the low Dominated Factors becoming the efficient extraction of restriction gas gradually of gas permeability of coal seam.Therefore, strengthen anti-reflection becoming and improve gas pumping effect, realize the key technology of deep coal and gas power phenomenon.Blasting shock wave damage coal body enhanced gas extraction method is one of effective measures that facts have proved in recent years.It mainly leans against inside, coal seam and installs explosive, and the shock wave utilizing blast to produce carries out damage to coal body, produces crack, thus increases gas permeability of coal seam, improves gas pumping effect.But this method exists powder charge difficulty or powder charge blind area, restriction is on-the-spot applies or occurs the phenomenon that release is uneven.The bothersome effort of powder charge.Direction of crack propagation is inadequate, can not be formed " Mohaupt effect ".In addition, explosive is dangerous matter sources inherently, produces also there is certain threat for downhole safety.Therefore, it is very necessary for finding the anti-reflection measure of a kind of strengthening safe and reliable, time saving and energy saving, simple and with low cost, and this is to raising mine gas extraction efficiency and prevent coal and gas prominent significant.
Essentially, gas explosion is the vigorous oxidation reaction that certain density methane and air occur.When gas density lower than 5% time, meet fire do not explode, but can flame periphery formed burning zone, when gas density is 9.5%, its brisance maximum (oxygen and gas complete reaction); When gas density is more than 16%, lose its explosivity, but chance fire still can burn in atmosphere.The HTHP that gas explosion produces, impels the gas near quick-fried source outwards to impact with great speed, causes casualties, and destroys tunnel and equipment facility, and a large amount of coal dust make it to participate in blast kicked up, produces larger destructive power.In addition, generate a large amount of pernicious gases after blast, the personnel that cause are poisoned to death.For a long time, gas explosion brings huge threat to the safety in production in colliery.But, when gas explosion realizes controlled, and by the impact force fracturing coal body of gas explosion, build Fracture Networks; Meanwhile, the fuel factor that blast produces can reduce gas adsorption potential energy, promotes desorption of mash gas flowing, has a very important role to raising drilling gas extracting result.
At present, hydraulic slotted liner technique obtains and applies comparatively widely in coal mine underground coal bed strengthening is anti-reflection, but effective influence basin of single slot boring is still limited.And slot has cumulative action of well leading, therefore, the advantages of gas blastingfracture coal body and hydraulic slotted liner technique in boring is got up, forms the integrated of technology and can further improve single hole gas pumping effect, realize safety in production.
Summary of the invention
Technical problem: the object of the invention is the weak point overcome in prior art, provides the anti-reflection technical measures of strengthening safe and reliable, time saving and energy saving, simple and with low cost.
Technical scheme: hydraulic slotted liner technique and the combined reinforced pumping method of gas explosion fracturing coal body in one boring of the present invention, comprising: the 1) position, hole of interlaced arrangement drainage holes and explosive hole in coal seam; 2) construct drainage holes, sealing of hole, link gas pumping pipe network and carry out gas pumping; 3) creep into through roof 1m place at position, the hole place of explosive hole with rig, move back brill, with high-pressure spray cutting explosive hole surrounding medium, form some slots; Also comprise the steps:
A. by the conducting wire binding of igniter on detector tube, then detector tube is sent at the bottom of explosive hole, makes the wire front end of colligation on detector tube be positioned in the middle part of coal seam;
B. Grouting Pipe, return pipe and air injection pipe are sent in explosive hole, block aperture;
C. open grouting pump, slip casting in explosive hole, when return pipe overfall, stop slip casting;
D., after grout cures, open air pump, in explosive hole, be pressed into air by air injection pipe;
E. open the valve on detector tube, detect the gas density in explosive hole by portable watt of inspection instrument, when gas density reaches 9 ~ 10%, close air pump and valve;
F. starting ignition device, ignites the gas in explosive hole, the coal body around fracturing explosive hole, makes the major fracture produced in coal body along slot Directional Extension;
G. open valve, detector tube is incorporated to gas pumping pipe network and carries out gas pumping;
H., when the gas density detected in explosive hole when portable watt of inspection instrument is reduced to 30%, opens air pump, again in explosive hole, be pressed into air;
I., when gas density is down to 9 ~ 10%, air pump and valve is closed;
J. starting ignition device, again ignites the gas in explosive hole, further expands major fracture;
K. repeat step h ~ j, repeatedly ignite the gas in explosive hole, finally run through the drainage holes around explosive hole.
Described drainage holes and explosive hole line of centres distance are 15 ~ 20m; The pipeline section that described detector tube is positioned at coal seam section is evenly distributed with some apertures; Described air injection pipe is than overfall pipe range 0.5m.
Beneficial effect: owing to have employed technique scheme, first the present invention utilizes hydraulic turbulence to form slot, and release is anti-reflection, and desorption of mash gas is gushed out.Then air pump is utilized to be pressed into air in the boring of sealing, air and the gas premix gushed out form concentration at the gas mist of 9% ~ 10%, ignite mist by igniter, form explosion wave, under the guide effect of slot, further fracturing coal body.Slot provides larger blast space, strengthens the power of blast, can build Fracture Networks more fully; The fuel factor produced of simultaneously exploding can significantly reduce gas adsorption gesture, promotes desorption of mash gas and flowing, thus reaches the object of high gassy and low permeability coal seam strengthening gas pumping.The method is safe and reliable, with low cost, simple, time saving and energy saving.Significantly can expand the effective unload effects scope of single hole, make coal bed gas extraction efficiency improve more than 80%.
Accompanying drawing explanation
Fig. 1 is hydraulic slotted liner technique and the combined reinforced pumping method schematic diagram of gas explosion fracturing coal body in boring of the present invention.
In figure: 1-grouting pump, 2-air pump, 3-igniter, 4-Grouting Pipe, 5-return pipe, 6-detector tube, 7-valve, 8-air injection pipe.
Detailed description of the invention
Below in conjunction with accompanying drawing, one embodiment of the present of invention are further described:
As shown in Figure 1, to hydraulic slotted liner technique in up boring and the combined reinforced extraction of gas explosion fracturing coal body, the concrete steps of its method are as follows:
(1) position, hole of interlaced arrangement drainage holes and explosive hole in coal seam; Wherein, drainage holes and explosive hole line of centres distance are 15 ~ 20m;
(2) construct drainage holes, sealing of hole, link gas pumping pipe network and carry out gas pumping;
(3) creep into through roof 1m place at position, the hole place of explosive hole with rig, move back brill; With high-pressure spray cutting explosive hole surrounding medium, form some slots;
(4) by the conducting wire binding of igniter 3 on detector tube 6, then detector tube 6 is sent at the bottom of explosive hole, makes the wire front end of colligation on detector tube 6 be positioned in the middle part of coal seam; Wherein igniter adopts EPD series portable high-energy electric ignition device;
(5) Grouting Pipe 4, return pipe 5 and air injection pipe 8 are sent in explosive hole, shutoff is carried out to aperture;
(5) open grouting pump 1, slip casting in explosive hole, when return pipe 5 overfall, stop slip casting;
(6) after grout cures, open air pump 2, in explosive hole, be pressed into air by air injection pipe 8;
(7) open the valve 7 on detector tube 6, detect the gas density in explosive hole by portable watt of inspection instrument, when gas density reaches 9 ~ 10%, close air pump 2 and valve 7;
(8) starting ignition device 3, ignites the gas in explosive hole, the coal body around fracturing explosive hole, makes the major fracture produced in coal body along slot Directional Extension;
(9) open valve 7, detector tube 6 is incorporated to gas pumping pipe network and carries out gas pumping;
(10), when the gas density detected in explosive hole when portable watt of inspection instrument is reduced to 30%, opens air pump 2, again in explosive hole, be pressed into air;
(11) when gas density is down to 9 ~ 10%, air pump 2 and valve 7 is closed;
(12) starting ignition device 3, again ignites the gas in explosive hole, further expands major fracture;
(13) repeat step (10) ~ (12), repeatedly ignite the gas in explosive hole, finally run through the drainage holes around explosive hole.
The present invention also can to carrying out hydraulic slotted liner technique and the combined reinforced extraction of gas explosion fracturing coal body in lateral aperture and descending boring.
Claims (4)
1. hydraulic slotted liner technique and the combined reinforced pumping method of gas explosion fracturing coal body in boring, comprising: the 1) position, hole of interlaced arrangement drainage holes and explosive hole in coal seam; 2) construct drainage holes, sealing of hole, link gas pumping pipe network and carry out gas pumping; 3) creep into through roof 1m place at position, the hole place of explosive hole with rig, move back brill, with high-pressure spray cutting explosive hole surrounding medium, form some slots; It is characterized in that, also comprise the steps:
A. by the conducting wire binding of igniter (3) on detector tube (6), then detector tube (6) is sent at the bottom of explosive hole, makes the wire front end of colligation on detector tube (6) be positioned in the middle part of coal seam;
B. Grouting Pipe (4), return pipe (5) and air injection pipe (8) are sent in explosive hole, block aperture;
C. open grouting pump (1), slip casting in explosive hole, when return pipe (5) overfall, stop slip casting;
D., after grout cures, open air pump (2), in explosive hole, be pressed into air by air injection pipe (8);
E. open the valve (7) on detector tube (6), detect the gas density in explosive hole by portable watt of inspection instrument, when gas density reaches 9 ~ 10%, close air pump (2) and valve (7);
F. starting ignition device (3), ignites the gas in explosive hole, the coal body around fracturing explosive hole, makes the major fracture produced in coal body along slot Directional Extension;
G. open valve (7), detector tube (6) is incorporated to gas pumping pipe network and carries out gas pumping;
H., when the gas density detected in explosive hole when portable watt of inspection instrument is reduced to 30%, opens air pump (2), again in explosive hole, be pressed into air;
I., when gas density is down to 9 ~ 10%, air pump (2) and valve (7) is closed;
J. starting ignition device (3), again ignites the gas in explosive hole, further expands major fracture;
K. repeat step h ~ j, repeatedly ignite the gas in explosive hole, finally run through the drainage holes around explosive hole.
2. hydraulic slotted liner technique and the combined reinforced pumping method of gas explosion fracturing coal body in one boring according to claim 1, is characterized in that: described drainage holes and explosive hole line of centres distance are 15 ~ 20m.
3. hydraulic slotted liner technique and the combined reinforced pumping method of gas explosion fracturing coal body in one boring according to claim 1, is characterized in that: the pipeline section that described detector tube (6) is positioned at coal seam section is evenly distributed with some apertures.
4. hydraulic slotted liner technique and the combined reinforced pumping method of gas explosion fracturing coal body in one boring according to claim 1, is characterized in that: described air injection pipe (8) 0.5m longer than return pipe (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410405133.7A CN104314606B (en) | 2014-08-15 | 2014-08-15 | Hydraulic slotted liner technique and the combined reinforced pumping method of gas explosion fracturing coal body in a kind of boring |
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| CN201410405133.7A CN104314606B (en) | 2014-08-15 | 2014-08-15 | Hydraulic slotted liner technique and the combined reinforced pumping method of gas explosion fracturing coal body in a kind of boring |
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| CN104314606A true CN104314606A (en) | 2015-01-28 |
| CN104314606B CN104314606B (en) | 2016-01-13 |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106351613A (en) * | 2016-10-14 | 2017-01-25 | 安徽理工大学 | Continuous gas extraction method under condition of multiple times of repeated blasting disturbance of coals |
| CN106884656A (en) * | 2017-03-31 | 2017-06-23 | 中国矿业大学 | A kind of explosion water filling coupling softens coal body preventing and treating impulsion pressure method |
| CN110359909A (en) * | 2019-07-01 | 2019-10-22 | 安徽理工大学 | A kind of softening method for leaving coal column for hard coal seam |
| WO2019242191A1 (en) * | 2018-06-22 | 2019-12-26 | 中国矿业大学 | Hydraulic cutting seam and multistage combustion shock wave combined coal-fracturing gas extraction method |
| CN110925015A (en) * | 2019-12-16 | 2020-03-27 | 中国矿业大学(北京) | Technology for enhancing permeability of coal seam by utilizing water jet to drill cavity gas explosion |
| CN110984962A (en) * | 2019-12-27 | 2020-04-10 | 中国矿业大学 | Fluidized gas extraction monitoring method |
| CN112412417A (en) * | 2020-11-05 | 2021-02-26 | 河南理工大学 | The coal seam hydraulic power cave-making combined drilling heat injection permeability-increasing pumping-promoting method |
| CN112761586A (en) * | 2021-01-22 | 2021-05-07 | 中国矿业大学 | Drilling methane self-circulation blasting fracturing enhanced extraction method |
| CN112761588A (en) * | 2021-01-22 | 2021-05-07 | 中国矿业大学 | Shale reservoir methane in-situ combustion-explosion fracturing and combustion improver safe feeding cooperative control method |
| CN112878974A (en) * | 2021-01-22 | 2021-06-01 | 中国矿业大学 | Unconventional horizontal staged methane multistage pulse blasting fracturing enhanced extraction method for natural gas well |
| CN112878973A (en) * | 2021-01-22 | 2021-06-01 | 中国矿业大学 | Shale reservoir methane in-situ multistage pulse energy-gathering blasting fracturing method |
| CN112943348A (en) * | 2021-03-18 | 2021-06-11 | 华能煤炭技术研究有限公司 | Comprehensive prevention and control system and method for rock burst and gas of coal face |
| CN112963125A (en) * | 2021-03-16 | 2021-06-15 | 重庆大学 | Hydraulic punching and CO hole making2Method for extracting coal seam gas by explosion fracturing displacement synergistic strengthening |
| CN114934765A (en) * | 2022-05-19 | 2022-08-23 | 贵州一和科技有限公司 | Method for enhancing gas extraction efficiency by combining hydraulic joint cutting and loosening blasting of coal roadway |
| CN116816385A (en) * | 2023-04-27 | 2023-09-29 | 中铁十一局集团有限公司 | Grouting method and related equipment for water-rich broken surrounding rock |
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Cited By (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106351613A (en) * | 2016-10-14 | 2017-01-25 | 安徽理工大学 | Continuous gas extraction method under condition of multiple times of repeated blasting disturbance of coals |
| CN106884656A (en) * | 2017-03-31 | 2017-06-23 | 中国矿业大学 | A kind of explosion water filling coupling softens coal body preventing and treating impulsion pressure method |
| WO2019242191A1 (en) * | 2018-06-22 | 2019-12-26 | 中国矿业大学 | Hydraulic cutting seam and multistage combustion shock wave combined coal-fracturing gas extraction method |
| RU2735711C1 (en) * | 2018-06-22 | 2020-11-06 | Чайна Юниверсити Оф Майнинг Энд Текнолоджи | Method of extracting gas by loosening a coal bed by combining hydraulic cutting of grooves and combustion shock wave acting in several steps |
| US11131172B2 (en) | 2018-06-22 | 2021-09-28 | China University Of Mining And Technology | Method for extracting gas by fracturing coal seam through combination of hydraulic slotting and multi-stage combustion impact wave |
| CN110359909A (en) * | 2019-07-01 | 2019-10-22 | 安徽理工大学 | A kind of softening method for leaving coal column for hard coal seam |
| CN110925015A (en) * | 2019-12-16 | 2020-03-27 | 中国矿业大学(北京) | Technology for enhancing permeability of coal seam by utilizing water jet to drill cavity gas explosion |
| CN110925015B (en) * | 2019-12-16 | 2021-09-28 | 中国矿业大学(北京) | Technology for enhancing permeability of coal seam by utilizing water jet to drill cavity gas explosion |
| CN110984962A (en) * | 2019-12-27 | 2020-04-10 | 中国矿业大学 | Fluidized gas extraction monitoring method |
| CN110984962B (en) * | 2019-12-27 | 2021-04-06 | 中国矿业大学 | Fluidized gas extraction monitoring method |
| CN112412417A (en) * | 2020-11-05 | 2021-02-26 | 河南理工大学 | The coal seam hydraulic power cave-making combined drilling heat injection permeability-increasing pumping-promoting method |
| CN112412417B (en) * | 2020-11-05 | 2022-11-18 | 河南理工大学 | Method for promoting pumping of coal seam by combining hydraulic cave building with drilling, heat injection, permeability increase |
| CN112878973A (en) * | 2021-01-22 | 2021-06-01 | 中国矿业大学 | Shale reservoir methane in-situ multistage pulse energy-gathering blasting fracturing method |
| CN112878974A (en) * | 2021-01-22 | 2021-06-01 | 中国矿业大学 | Unconventional horizontal staged methane multistage pulse blasting fracturing enhanced extraction method for natural gas well |
| CN112761588A (en) * | 2021-01-22 | 2021-05-07 | 中国矿业大学 | Shale reservoir methane in-situ combustion-explosion fracturing and combustion improver safe feeding cooperative control method |
| CN112761588B (en) * | 2021-01-22 | 2022-02-08 | 中国矿业大学 | Shale reservoir methane in-situ combustion-explosion fracturing and combustion improver safe feeding cooperative control method |
| CN112761586B (en) * | 2021-01-22 | 2022-04-12 | 中国矿业大学 | Drilling methane self-circulation blasting fracturing enhanced extraction method |
| CN112761586A (en) * | 2021-01-22 | 2021-05-07 | 中国矿业大学 | Drilling methane self-circulation blasting fracturing enhanced extraction method |
| CN112963125A (en) * | 2021-03-16 | 2021-06-15 | 重庆大学 | Hydraulic punching and CO hole making2Method for extracting coal seam gas by explosion fracturing displacement synergistic strengthening |
| CN112963125B (en) * | 2021-03-16 | 2022-04-15 | 重庆大学 | Hydraulic punching hole-making and CO2 blasting fracturing displacement cooperative enhanced coal seam gas extraction method |
| CN112943348A (en) * | 2021-03-18 | 2021-06-11 | 华能煤炭技术研究有限公司 | Comprehensive prevention and control system and method for rock burst and gas of coal face |
| CN112943348B (en) * | 2021-03-18 | 2023-08-08 | 华能煤炭技术研究有限公司 | Comprehensive control system and control method for rock burst and gas of coal face |
| CN114934765A (en) * | 2022-05-19 | 2022-08-23 | 贵州一和科技有限公司 | Method for enhancing gas extraction efficiency by combining hydraulic joint cutting and loosening blasting of coal roadway |
| CN114934765B (en) * | 2022-05-19 | 2022-12-06 | 贵州一和科技有限公司 | Method for enhancing gas extraction efficiency by combining hydraulic joint cutting and loosening blasting of coal roadway |
| CN116816385A (en) * | 2023-04-27 | 2023-09-29 | 中铁十一局集团有限公司 | Grouting method and related equipment for water-rich broken surrounding rock |
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