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《Coal Science and Technology》 2018-05
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Study on borehole sealing technique with sealing and isolation integration to gas drainage borehole along seam

GUO Lindong;ZHAO Xusheng;ZHANG Yongjiang;LIU Yanbao;China Coal Research Institute;State Key Lab of Mine Gas Disaster Monitoring and Emergency Technology;Chongqing Research Institute,China Coal Technology and Engineering Group;  
In order to improve the sealing performances of the gas drainage borehole along the seam and to ensure the gas drainage effect,based on the conventional pressurized grouting and sealing technique with"two sealing and one grouting",in combination with the superhigh pressure hydraulic slotting technology,a sealing and isolation borehole sealing technique was provided.Thus a slotting method was applied at the borehole sealing section for the auxiliary borehole sealing.With the analysis on the stress and air leakage mode of the borehole,the stress distribution features of the coal around the borehole and the pressure released scope were studied and three type air leakage channels were determined.The paper stated the principle the"sealing and isolation integration"sealing technique and determined the relevant technical parameters were determined.The site test results showed that the gas drainage borehole with the"sealing and isolation integration"obtained good borehole sealing effect.The volume fraction of the drained gas was 25% ~ 30% higher than conventional borehole sealing method under the same condition,could reduce the decay rate of the drained gas concentration and could provide a good borehole sealing method of the gas drainage borehole along the seam.
【Fund】: 国家重点研发计划资助项目(2017YFC0804206);; 国家科技重大专项资助项目(2016X05067-004-004);; 中国煤炭科工集团重庆研究院有限公司院自立科研资助项目(2017YBXM31)
【CateGory Index】: TD712.62
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