摘要
针对豫西松软低透气煤层,瓦斯含量大,抽采效果差的问题,采用煤层注气强化瓦斯抽采治理技术,选择华泰煤矿进行注气强化瓦斯抽采效果现场试验。研究结果表明,随着注气时间的增长,注气孔气体压力由0.41 MPa上升到0.54 MPa,注气孔气体压力与注气时间成正比关系,沿孔长压力递减梯度与注气时间成反比关系;注气前后,煤层瓦斯含量和组分都有大幅度的下降,下降值为2.26~0.94 m^(3)/t,下降幅度为15%~38%;垂直注气孔方向2 m范围内,煤层瓦斯含量和组分随着与孔距离的减少,注气后排放孔瓦斯流量增加近7倍;井下煤层注空气强化瓦斯抽采效果显著。
In view of the problems of large gas content and poor drainage effect in soft and low permeability coal seam in western Henan Province,the coal seam gas injection strengthening gas drainage treatment technology was adopted,and Hua-tai coal mine was selected for field test of gas injection strengthening gas drainage effect.The results show that with the increase of gas injection time,the gas pressure of gas injection hole increases from 0.41 Mpa to 0.54 Mpa,the gas pressure of gas injection hole is directly proportional to the gas injection time,and the decreasing gradient of pressure along the hole length is inversely proportional to the gas injection time;before and after gas injection,the gas content and composition of coal seam have a significant decrease,the decrease value is 2.26~0.94 m^(3)/t,the decrease range is 15%~38%;vertical gas injection Within the range of 2m in the hole direction,with the decrease of the distance from the hole,the gas flow of the drainage hole increases nearly 7 times;the effect of underground coal seam air injection to enhance gas drainage is remarkable.
作者
孙炳兴
SUN Bingxing(China Coal Technology and Engineering Group Chongqing Research Institute,Chongqing,400037,China;National Key Laboratory of Gas Disaster Detecting,Preventing and Emergency Controlling,Chongqing 400037,China)
出处
《煤矿现代化》
2021年第4期119-122,共4页
Coal Mine Modernization
基金
重庆市自然科学基金面上项目(cstc2020jcyj-msxmX1052)。
关键词
瓦斯抽采
注气驱替
注气压力
瓦斯含量
Gas drainage
Gas injection displacement
Gas injection pressure
Gas content
