基于定向长钻孔抽采瓦斯的数值模拟研究  

Numerical simulation study of gas drainage based on directional long drilling

作　　者：王广宏 WANG Guanghong(CCTEG Chongqing Research Institute,Chongqing 400037,China)

机构地区：[1]中煤科工集团重庆研究院有限公司,重庆400037

出　　处：《矿业安全与环保》2021年第4期38-42,共5页Mining Safety & Environmental Protection

摘　　要：针对新疆榆树田煤矿定向长钻孔预抽煤层瓦斯问题,结合5号煤层及顶底板岩层参数,建立了5号煤层瓦斯流固耦合随动渗流模型,分析了在一定的抽采负压和抽采时间下,定向长钻孔长度及钻孔间距对煤层瓦斯抽采量的影响。在抽采负压不变的情况下,瓦斯抽采总量会随着钻孔长度的增大而增大,但当钻孔长度增大到650 m左右时,瓦斯抽采总量趋于稳定,定向长钻孔合理长度定为650 m;钻孔间距越大,瓦斯抽采量越少,在钻孔间距从5 m增加到20 m的过程中,间距每增大5 m,抽采量约减少5%~7%。Aiming at the problem of pre-drainage coal seam gas from directional long drilling in Yushutian Coal Mine in Xinjiang,combined with the parameters of No.5 coal seam and top and bottom slate,the gas fluid-solid coupling random seepage model of No.5 coal seam was established,the influence of length and spacing of directional long drilling holes on coal seam gas extraction was analyzed under certain negative pressure and extraction time.When the negative pressure of extraction remains unchanged,the total amount of gas extraction will increase with the increase of drilling length,but when the drilling length increases to about 650 m,the total amount of gas extraction tends to stable,and the reasonable length of directional drilling is 650 m;the larger the spacing between drillings,the smaller the amount of gas extraction.When the spacing between drillings increases from 5 m to 20 m,the amount of gas extraction decreases by about 5%to 7%with each increase of 5 m.

关 键 词：定向长钻孔 预抽煤层瓦斯 流固耦合 随动渗流模型 钻孔参数 数值模拟 

分 类 号：TD712[矿业工程—矿井通风与安全]