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《Chinese Journal of Geophysics》 2013-05
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Mechanism of methane permeability enhance through ultrasonic irradiating on low permeable coal seam

XIAO Xiao-Chun1,PAN Yi-Shan1,L Xiang-Feng3*,YANG Xin-Le1,2 1 Institute of Mechanics and Engineering,Liaoning Technical University,Liaoning Fuxin 123000,China 2 Mining Technology Institute,Taiyuan University of Technology,Taiyuan 030024,China 3 Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China  
Ultrasonic irradiation enhancement of coal seam methane is a kind of technology with general applicable value,which is not limited by reservoir geologic conditions and source gas characteristics.However,because of the reservoir densification,there exist scale effects such as matrix pore throat scale and the natural crack dimensions overlap,the reservoir medium permeability enhancement and extraction promotion mechanism is not clear.This article used CT observation experiment and permeability measurement experiment to analyze the rule of fracture development of different scales in coal samples under ultrasonic effect,compared the change of coal sample permeability by ultrasound effect,and established the modified formula of ultrasound enhancement of coal seam methane permeability.Research results show that: CT observation clearly proved the ultrasonic mechanical shattering effect;within the attenuation scope of ultrasound,coal body damage and mechanical shatter effect are obvious;permeability of coal seam increased 135%~169% on average by ultrasonic irradiation.Research work provides experimental basis for increasing the permeability of coal seam by ultrasonic irradiation.
【Fund】: 国家自然科学基金青年科学基金项目(51004061);; 国家重点基础研究发展计划(973计划)项目(2010CB226803);; 2011年辽宁省教育厅科学研究一般项目(L2011049)资助
【CateGory Index】: P631.5;TD712.1
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