钻孔预抽煤层瓦斯影响规律研究

给定煤层多孔介质渗流边界条件,湍流计算选用k—ε模型,瓦斯在煤层中流动采用多孔介质模型,研究了在不同的抽采时间、负压、渗透率、煤层瓦斯压力及不同的钻孔直径等条件下钻孔的抽采半径及抽采量变化规律,研究结论对于现场预抽煤层瓦斯钻孔参数设计有理论指导意义。

Study on Influencing Rule of Coal-bed Methane Predrainage by Boreholes

In this paper,the boundary conditions for porous media seepage model of coal seam was given,and the k-e model was selected for turbulence calculation. On basis of the porous medium model of gas flowing in coal seam,study was made on the variation regularity of gas drainage radius and quantity of boreholes under the conditions of different drainage time,different negative pressure,different permeability,different seam gas pressure and different borehole diameter. The study results have the theoretical guiding significance for the design of borehole parameters for coalbed gas pre-drainage.