煤层渗透率各向异性对本煤层瓦斯预抽影响规律的研究

发布时间：2018-03-25 02:35

本文选题：煤层　切入点：渗透率　出处：《矿业安全与环保》2017年05期

【摘要】：针对新景矿8#煤层透气性差,瓦斯抽采困难等问题,采用实验室测定和现场试验的方法,研究其渗透率各向异性对本煤层瓦斯抽采的影响规律。实验室测试结果表明:煤层渗透率沿走向最大,沿倾向次之,沿竖直方向最小,瓦斯渗流的优势方向与煤层走向平行。现场瓦斯抽采试验表明:与煤层走向夹角90°的钻孔平均瓦斯抽采流量达到0.11 m~3/min,夹角30°的钻孔平均瓦斯抽采流量仅为0.015 m~3/min,即钻孔与煤层走向夹角越大,抽采流量越大;抽采60 d后,钻孔与煤层走向夹角大的区域煤层残余瓦斯含量降幅较大。该研究成果对本煤层瓦斯预抽钻孔的合理布置,提高瓦斯抽采效率具有一定的指导意义。
[Abstract]:Aiming at the problems of poor gas permeability and difficult gas drainage in the coal seam 8# of Xinjing Coal Mine, the methods of laboratory measurement and field test are adopted. The influence of permeability anisotropy on the gas drainage in this coal seam is studied. The laboratory test results show that the permeability of coal seam is the largest along the direction, the second is along the tendency, and the smallest is along the vertical direction. The results of field gas extraction test show that the average gas drainage flow from the 90 掳borehole with the seam strike angle reaches 0.11 mm / min, and the average gas drainage discharge from the 30 掳angle hole is only 0.015 mm3 / min, that is to say, the average gas drainage discharge of the borehole with the angle of 30 掳is only 0.015 mm3 / min. The greater the angle between borehole and coal seam strike, The larger the drainage flow, the greater the residual gas content in the coal seam in the area with large strike angle between the borehole and the coal seam after 60 days of drainage. The reasonable arrangement of the gas pre-drainage borehole in this coal bed is obtained by the research results. It has certain guiding significance to improve the efficiency of gas drainage.
【作者单位】：中国矿业大学(北京)资源与安全工程学院;阳泉煤业集团(有限)责任公司;中国矿业大学(北京)共伴生能源精准开采北京市重点实验室;中国矿业大学(北京)煤炭资源与安全开采国家重点实验室;
【分类号】：TD712.6

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