Influence of combination forms of intact sub-layer and tectonically deformed sub-layer of coal on the gas drainage performance of boreholes: a numerical study

Wei Zhao; Kai Wang; Rong Zhang; Huzi Dong; Zhen Lou; Fenghua An

首页> 中文期刊> 《国际煤炭科学技术学报：英文版》 >Influence of combination forms of intact sub-layer and tectonically deformed sub-layer of coal on the gas drainage performance of boreholes: a numerical study

Influence of combination forms of intact sub-layer and tectonically deformed sub-layer of coal on the gas drainage performance of boreholes: a numerical study

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High concentration and large flow flux of gas drainage from underground coal seams is the precondition of reducing emission and large-scale use of gas.However,the layered occurrence of coal seams with tectonically deformed sub-layers and intact sub-layers makes it difficult to effectively drain gas through commonly designed boreholes.In this study,the gas drainage performance in coal seams with different combinations of tectonically deformed sub-layers and intact sub-layers was numerically analyzed.The analysis results show that the gas drainage curve changes from a single-stage line to a dual-stage curve as the permeability ratios of Zone II(kII)and Zone I(kI)increase,raising the difficulty in gas drainage.Furthermore,a dual-system pressure decay model based on the first-order kinetic model was developed to describe the dual-stage characteristics of pressure decay curves with different permeability ratios.In the end,the simulation results were verified with reference to in-situ drainage data from literature.The research results are helpful for mines,especially those with layered coal seams comprising tectonically deformed sub-layers and intact sub-layers,to choose appropriate gas drainage methods and develop the original drainage designs for achieving better gas drainage performance.

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《国际煤炭科学技术学报：英文版》 |2020年第3期|P.571-580|共10页
作者
Wei Zhao; Kai Wang; Rong Zhang; Huzi Dong; Zhen Lou; Fenghua An;
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作者单位

Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources China University of Mining&Technology Beijing Beijing 100083 ChinaSchool of Emergency Management and Safety Engineering China University of Mining&Technology Beijing Beijing 100083 ChinaState Key Laboratory Cultivation Base for Gas Geology and Gas Control(Henan Polytechnic University) Jiaozuo 454003 China;

Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources China University of Mining&Technology Beijing Beijing 100083 ChinaSchool of Emergency Management and Safety Engineering China University of Mining&Technology Beijing Beijing 100083 China;

Flight Technology College Civil Aviation University of China Tianjin 300300 China;

Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources China University of Mining&Technology Beijing Beijing 100083 ChinaSchool of Emergency Management and Safety Engineering China University of Mining&Technology Beijing Beijing 100083 China;

Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources China University of Mining&Technology Beijing Beijing 100083 ChinaSchool of Emergency Management and Safety Engineering China University of Mining&Technology Beijing Beijing 100083 China;

State Key Laboratory Cultivation Base for Gas Geology and Gas Control(Henan Polytechnic University) Jiaozuo 454003 China;

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原文格式 PDF
正文语种 chi
中图分类无机化学;
关键词
Tectonically deformed coal; Pressure decay; Permeability; Hydraulic flushing boreholes;

机译：构造变形煤;压力衰减;渗透率;液压冲孔;

Influence of combination forms of intact sub-layer and tectonically deformed sub-layer of coal on the gas drainage performance of boreholes: a numerical study

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