Results 21 to 30 of about 6,679 (242)
Meikuang Anquan, 2020 There is no uniform standard for determining the drainage effective radius of CO2 phase transition fracturing in view of the fact, we analyze the traditional measurement for drainage effective radius, clarify definition of drainage radius.
SUN Zhuoyue, YANG Dong, PEI Yue, SUN Liuwei, MA Xiaomin
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Research on effective drainage radius and rational borehole spacing of parallel boreholes
Gong-kuang zidonghua, 2019 In order to determine rational borehole spacing of parallel boreholes for gas drainage, a fluid-solid coupling model of gas drainage was established by deducing gas migration equation of coal seam, deformation equation of coal and rock, and coupling ...
SANG Naiwen, YANG Shengqiang, SONG Yawei
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Advances in Civil Engineering, 2021 Gas disasters have been always a major hidden danger that affects mining safety in coal mines. Gas drainage by drilling is the fundamental method of gas control in coal mines.
Zongyong Wei +5 more
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Measurement of effective radius of gas drainage of bedding drill hole in low permeability coal seam
Gong-kuang zidonghua, 2014 In view of low permeability characteristics of No.3 coal seam in Changping Coal Mine, the effective radius of gas drainage of bedding drill hole was measured and analyzed by improving sealing process with polyurethane-expansive cement and use of hole ...
WANG Xing +3 more
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A phase transition-induced fracturing permeability enhancement technology using carbon dioxide capsules for low-permeability coal seams and its application [PDF]
Meitian dizhi yu kantanObjective and Methods To address engineering challenges like high gas content, high pressure, and low drainage efficiency in the mining of low-permeability coal seams, this study developed a phase transition-induced fracturing and permeability ...
Mao LI, Xinchuan FAN, Hui FU
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Geofluids, 2020 Mining high-gas coal seams in China has the characteristics mining of deep, high storage and low permeability, and low drainage efficiency, which seriously restrict the efficient prevention and control of mine gas disasters.
Hu Wen +7 more
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A Gas–Solid–Liquid Coupling Model of Coal Seams and the Optimization of Gas Drainage Boreholes
Energies, 2018 For a gas–solid–liquid coupling model of coal seams, previous permeability models basically supposed uniaxial strains as the boundary condition for coal reservoirs without considering the deformation caused by changes in humidity.
Yuexia Chen +4 more
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Shock and Vibration, 2021 To solve the problems of gas predrainage in deep seams with “three softs” and low-air permeability, hydraulic punching pressure relief antireflection technology is proposed on the basis of the research background of gas predrainage technology in Lugou ...
Beifang Gu, Yanling Wu
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Procedia Engineering, 2011 Taking the heading face of a coal mine as an example, the test of deep-hole pre-splitting blasting was processed. The amount of gas draining after pre-splitting was compared to the amount of direct drainage, and the effective radius of drainage was ...
Xiaogang, Fan +3 more
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Advances in Civil Engineering, 2021 Based on artificial freezing engineering practice, the comprehensive technology is suggested to realize safe and fast rock cross-cut coal uncovering, which mainly includes four steps of drilling, water injection wetting coal, gas drainage, and injection ...
Heyi Ma +3 more
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