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软弱煤层瓦斯抽采钻孔成孔后,因煤质松软致使塌孔,造成瓦斯抽采浓度低、纯量低等问题。针对该问题提出采用筛管护孔抽采工艺,并在某矿23采区1~#回风下山掘进工作面与常规钻孔抽采工艺进行现场工业性试验,试验结果显示:采用筛管护孔抽采工艺可以使瓦斯抽采浓度达到39.2%,比常规抽采工艺提高了近1.6倍;纯瓦斯流量达到0.24 m~3/min,比常规抽采工艺提高了近1.8倍。该技术很好地解决了软弱煤层抽采钻孔容易塌孔、抽采效果差的问题,增加了工作面瓦斯抽采量,提高了工作面预抽瓦斯治理效果,具有很好的应用前景。
After weak coal seam gas pumping and drilling, the coal will be slack due to loose coal, resulting in low gas extraction concentration and low scalability. Aiming at this problem, we proposed the use of sieve pipe shield mining technology, and carried out on-site industrial tests on 1 ~ # return wind tunneling face and conventional drilling extraction process in 23 mining area of a mine. The test results show that: The hole extraction process can make the gas extraction concentration reach 39.2%, which is 1.6 times higher than the conventional extraction process; the pure gas flow rate reaches 0.24 m ~ 3 / min, which is 1.8 times higher than the conventional extraction process. The technology solves the problem of easily collapsible holes and poor pumping efficiency of the drilled holes in the soft coal seam, increases the amount of gas drainage in the working face and improves the effect of pre-pumping gas in the working face and has good application prospect.