地面钻井抽采工作面瓦斯高位环形体参数的模拟研究
Simulation Study on Parameters of “High-level Annular Body” for Surface Drilling and Drainage Face
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摘要: 将地面钻井布置在工作面上方的“高位环形体”中能有效提高瓦斯抽采效率。基于潘三矿17171(1)工作面条件,利用COSFLOW数值模拟软件,研究确定了瓦斯抽采的“高位环形体”范围及位置。结果表明:“高位环形体”的高度介于开采煤层上方20~108 m范围内,邻近工作面的前部区域在工作面推进方向140 m,向顶板延展的外边界倾角为70°,内边界倾角为80°;在17171(1)工作面回采期间,地面钻井平均抽采流量为18.27 m3/min,比传统方法提高了14.2%;地面钻井抽采瓦斯浓度最大值为98%,平均为50%,符合瓦斯利用的浓度要求。Abstract: It can effectively improve gas drainage efficiency by arranging the surface drilling in the “high-level annular body” above the working surface. Based on the working condition of 17171(1) of Pansan Coal Mine, COSFLOW numerical simulation software was used to study and determine the range and location of the “high-level annular body” for gas drainage. The results show that: the height of the “high-level annular body” is within 108 m and 20 m above the mining coal seam. The front area adjacent to the working face is 140 m in advance direction of the working face. The outer boundary inclination angle extending to the roof is 70°, and the inner boundary inclination angle is 80°. During the recovery of 17171(1) working face, the average gas drainage flow volume of the surface drilling was 18.27 m3/min, which was 14.2% higher than the traditional method; the maximum value of the gas concentration for surface drilling drainage is 98% and the average is 50%, which meets the concentration requirements well for gas utilization.
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Keywords:
- surface drilling /
- gas drainage /
- high-level annular body /
- COSFLOW /
- pressure relief /
- permeability
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