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《Coal Science and Technology》 2013-01
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Study on Permeability Rate Variation Features of Mine Coal Bed Methane Reservoir Duing Gas Drainage Process of Coal Bed Methane Well

GUO Hui1,FANG Xin-liang1,WANG Xue-ying1,ZHENG Long2(1.School of Resources and Safety Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China; 2.School of Electromechanical and Information Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)  
With the establishment of the mathematical model between the variation rate of permeability rate and volume strain of coal reservoir.The variation of the volume strain and permeability rate in the seam reservoir during the coal bed methane development process was investigated.The results showed that the volume strain of the seam reservoir during the coal bed methane development process could be divided into two stages.At the initial stage,the volume would be shrunk and the volume strain would be negative.With the effective stress varied,the volume strain would be steadily be positive and would be continuously increased.But the permeability rate would have an asymmetric U type variation with firstly reduction and then increasing and finally would be increased by 1.5 times.
【Fund】: 国家自然科学基金重点资助项目(50834005);; “十一五”国家科技支撑计划资助项目(2009BAK54B03);; 中央高校基本科研业务费专项资金资助项目(2010YZ05)
【CateGory Index】: TD84
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