地面钻井瓦斯抽采效果分析

Analysis of Gas Drainage Effect in Surface Borehole

针对李雅庄矿605工作面瓦斯含量大、煤层透气性低,预抽后可解吸瓦斯含量较高,传统瓦斯抽采方法不能满足工作面安全开采需求,采用地面钻井,将钻井布置在煤壁支撑区和重新压实区之间,对上隅角瓦斯进行截抽,起到很好的效果。抽采结果表明:采用地面钻井,抽采浓度可达16.2%,抽采纯量达8.74 m3/min,其中1#钻井共抽采瓦斯41.53万m3,和同一工作面高位钻场相比抽采纯量和总量分别提高139%和124%;通过对不同布置层位地面钻井抽采效果进行分析,表明地面钻井随着布置位置靠近回风巷,井身的稳定性和抽采效果呈现减弱趋势,在工作面推过钻井84 m左右井身结构遭到严重破坏。

Traditional gas drainage method cannot satisfy the safety mining due to high gas content, low seam permeability and high desorbed gas content after pre-drainage at 605 working face of Liyazhuang Colliery. The author proposes the application of surface borehole laid between coal wall support area and recompaction area in gas cutoff drainage at upper corner, which shows good drainage effect with 16.2% drainage concentration, 8.74 m3/min drainage scalar and increase of 139% and 124%respectively in drainage scalar and total amount comparing to the high-level drilling field at same working face.