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《Coal Science and Technology》 2014-07
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Study on Gas Drainage Technology of Throughput Fracturing Permeability Improvement by Borehole in Underground Mine

TAO Yun-qi;LIU Xiao;LIN Hai-xiao;School of Energy Science and Engineering,Henan Polytechnic University;Yongcheng Coal and Electric Power Holding Group Corporation Limited;State Key Laboratory Cultivation Base for Gas Geology and Gas Control;  
In order to obviously enlarge the coefficient of the seam permeability and reach a target of the high efficient gas drainage,a gas drainage technology of throughput fracturing permeability improvement by borehole in underground mine was provided. It was found that during the operation of the throughput fracturing,radial guided fracturing,peripheral guided fracturing,shearing fracturing,turning fracturing and others occurred on the max and min horizontal main stress directions. The gas migration channel with a high speed was formed under the displacement support compatibilization of the borehole surface wall. The site experiments showed that after the throughput fracturing conducted,in comparison with no measure conducted,the pure quantity of gas drainaged from a single borehole increased by 7 ~ 12 times,the volume fraction of gas drainaged increased by 4 ~ 5 times,and the attenuation coefficient of the borehole gas flow reduced by 1 /4 ~ 1 /3. In comparison with the conventional hydraulic fracturing,the pure quantity of gas drainaged increased by 1. 6 ~ 3. 0 times,the volume fraction of gas drainaged increased by 1. 2 ~ 2. 0 times,and the attenuation coefficient of the borehole gas flow reduced by 1 /5 ~ 1 /3.
【Fund】: “十二五”国家科技支撑计划资助项目(2012BAK04B01);; 河南省教育厅科学技术研究重点资助项目(13A440320);; 煤层气资源与成藏过程教育部重点实验室(中国矿业大学)开放基金资助项目(2013-003)
【CateGory Index】: TD712.6
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