摘要
为解决高瓦斯低透气性煤层瓦斯抽难题,寻找高效、经济、适用范围广的增透新方法,在新景公司佛洼北九正巷和保安南四采区进行CO_2煤层预裂增透工程试验,通过对瓦斯抽采浓度、流量、抽采半径等参数观测分析结果表明:进行CO_2预裂后能将瓦斯平均浓度由预裂前的9%提高到预裂后的19%,起到很好的增透效果;预裂影响的有效半径在30~50m范围之内;在CO_2预裂时,爆孔周围存在应力集中区,冲击波在传播过程中,存在"应力释放—应力集中—应力释放"的波形循环,这一规律影响着CO_2预裂作用效果。
In order to solve the problem in high gas and low permeability coal seam gas drainage,and search for effective,economic,applicable permeability increment technology,CO2 coal seam pre-fracturing engineering test was carried out in an underground coal mine. According to the monitoring results of gas drainage concentration,flow rate,drainage radius and other observation parameters,after CO2 pre-fracturing,the average gas concentration can be increased from 9% to19%,showing a favorable permeability increment effect; the effective radius of pre-fracturing is within the range of 30-50 m; during CO2 pre-fracturing,there is a stress concentration area around the blasthole; and during the propagation of the shock wave,there is a waveform of stress release-stress concentration-stress release,which affects the effect of CO2 pre-fracturing.
作者
武志高
令狐建设
赵庆珍
郭爱军
温兆翠
WU Zhi-gao;LINGHU Jian-she;ZHAO Qing-zhen;GUO Ai-jun;WEN Zhao-cui(Shanxi Institute of Energy,Jinzhong 030600,China;Yangquan Coal Industry（Group）Co.,Ltd.,Yangquan 045000,China)
出处
《煤炭工程》
北大核心
2018年第8期68-71,共4页
Coal Engineering
关键词
CO2预裂
增透
瓦斯抽采
波形循环
CO2 pre-fracturing
permeability increment
gas drainage
waveform cycle
