变径高位钻孔“分段叠抽”采空区瓦斯技术  

“Sectional Gas Drainage” Technology in Goaf for High Level Borehole of Diameter Variation

作　　者：苏伟伟 田野 SU Weiwei;TIAN Ye(China Coal Technology and Engineering Group Shenyang Research Institute,Fushun 113122,China;State Key Laboratory of Coal Mine Safety Technology,Fushun 113122,China;Hunchun Mining Group of Baliancheng Limited Company,Hunchun 133300,China)

机构地区：[1]煤科集团沈阳研究院有限公司,辽宁抚顺113122 [2]煤矿安全技术国家重点实验室,辽宁抚顺113122 [3]珲春矿业(集团)八连城煤业有限公司,吉林珲春133300

出　　处：《煤矿安全》2018年第12期64-67,71,共5页Safety in Coal Mines

基　　金："十三五"国家大型油气田及煤层气开发科技重大专项资助项目(2016ZX05045-004-001)

摘　　要：针对八连城煤矿近距离煤层群受19号煤层采动影响,大量卸压瓦斯涌入采空区造成工作面上隅角和支架后方超限极度严重等问题,基于采空区瓦斯流动基本形式及顶板覆岩移动规律,采用变径高位钻孔布置技术,通过变径高位孔-细径段主动拦截上邻近层卸压瓦斯和变径高位孔-扩径段被动抽降下邻近层及采空区遗煤解吸瓦斯,实现"分段叠抽"的采空区瓦斯治理模式。经在31906回采工作面对比试验,结果表明:与传统高位钻孔对比,变径高位钻孔的混合瓦斯抽采流量增大10倍以上,平均瓦斯抽采浓度提高251.58%,平均瓦斯抽采纯量增大36倍;较同直径的埋管抽采技术,平均瓦斯抽采浓度增大4～6倍;该技术将31906工作面回采期间上隅角和支架后方的瓦斯浓度分别控制在0.5%～0.7%、0.6%～0.9%,保障采煤工作连续进展。Aim at the problems that closed distance seam group is influenced during No.19 coal seam mining, a large amount of pressure relief gas poured into the goaf which causes serious gas exceeding at the upper corner and behind the support. High level borehole of diameter variation is proposed based on basic form of gas flow in goaf and movement laws of overlying strata. The gas released from the upper adjacent layer is passively removed by using high level borehole-thin diameter section and the gas released from the lower adjacent layer and rest of coal in goaf is passivity drainage by using high level borehole-enlarge diameter section, which realizes the pattern about sectional gas drainage in goaf. The test is carried out at 31906 working face. The result shows that high level borehole of diameter variation is compared with the traditional high level borehole, the mixed gas flow increases more than 10 times. The extraction concentration increased 251.58%. The average of gas extraction scalar increased 36 times. The average of gas extraction concentration increases 4 to 6 times compared with the same diameter of the pipe drainage technology. The gas concentration at the upper corner and behind the support is controlled between 0.5% and 0.7%, and between0.6% and 0.9%, respectively, which ensures continuous progress of coal mining.

关 键 词：近距离煤层群 变径高位钻孔 传统高位钻孔 上隅角 瓦斯浓度 瓦斯抽采 

分 类 号：TD713[矿业工程—矿井通风与安全]