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《Coal Science and Technology》 2014-12
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High Efficient Gas Drainage Technology with Fast Full Length Screen Pipe for Borehole Protection in Soft Seam

LIU Qing-quan;TONG Bi;FANG You-xiang;TU Qing-yi;GUO Shuai-fei;National Engineering Research Center of Mine Gas Control,China University of Mining and Technology;Geological Exploration Engineering Division,Huainan Mining Group Corporation Limited;  
According to the status of a low borehole gas drainage concentration in a soft seam,small drainage quantity and borehole easycollapsed and jammed,a high efficient gas drainage technology with fast full length screen pipe for the borehole protection in the soft seam was provided and the related key equipment was introduced. The application in a typical mine site of Huainan Mining Area showed that with the application of the technology,75% of the borehole could be realized and completed within one hour,all boreholes could be completed with two hours and 85% of the borehole screen pipe could be set to 81% of the borehole depth. A gas drainage volume fraction of a single borehole could be increased from 30% to 60% and the pure gas drainage volume could be increased from 0. 03 m3/ min to 0. 06 m3/ min. The unit gas drainage volume fraction was increased about 120% and pure gas drainage quantity was increased from 2. 0 m3/ min to 4. 2 m3/min. The application of the technology could eliminate borehole failure caused by borehole collapsed,could highly improve the reliability of borehole gas pre- drainage and could ensure the gas pre- drainage effect of coal mining face.
【Fund】: 国家自然科学基金青年科学基金资助项目(51204173 41202118);; 中央高校基本科研业务费专项资金资助项目(2014ZDP08)
【CateGory Index】: TD712.6
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