大阳煤矿高位定向水平长钻孔瓦斯抽采技术应用实践

Application Practice of High Position Directional Horizontal Long Borehole Gas Extraction Technology in Dayang Coal Mine

为解决大阳煤矿3307工作面回采过程中回风流内和上隅角周围的瓦斯浓度超限问题,采用高位定向水平长钻孔对工作面采空区冒落带、裂隙带发育高度范围内的瓦斯进行了精准抽采。以3307工作面回风顺槽8号钻场3个高位定向水平长钻孔为例,对高位定向水平长钻孔瓦斯抽采效果进行了分析,工作面靠近8号钻场期间回风流瓦斯体积分数由0.45%下降至0.28%、上隅角瓦斯体积分数由0.51%下降至0.32%。

In order to solve the problem of gas concentration exceeding the limit in the return air flow and around the upper corner during the mining process of the 3307 working face in Dayang Coal Mine,high-precision gas extraction was carried out within the height range of the goaf caving zone and fracture zone development using high-level directional horizontal long drilling.Taking three high-level directional horizontal long boreholes in the No.8 drilling site of the 3307 working face as examples,the gas extraction effect of high-level directional horizontal long boreholes was analyzed.During the period when the working face was close to the No.8 drilling site,the gas volume fraction of the return air flow decreased from 0.45% to 0.28%,and the gas volume fraction of the upper corner decreased from 0.51%to 0.32%.