煤层渗透率预测瓦斯流量可行性研究

Feasibility study of coal seam permeability prediction of gas flow

由现场测定矿井瓦斯含量,根据煤样结构盒维数计算得到煤层渗透率,然后转化为区域煤层透气性系数经现场实测瓦斯流量曲线和数值模拟预测的钻孔瓦斯流量曲线分析,在走向趋势和数量级上没有差别,并且同时符合钻孔瓦斯流量衰减的规律,即呈指数衰减,说明预测渗透率反映了煤层钻孔瓦斯流动的真实情况。

In this paper,the gas content of a mine is measured and the permeability of the coal seam is calculatedaccording to the dimension of the coal sample structure.Then,the permeability coefficient of the coal seam ischanged.According to the measured gas flow curve and the numerical simulation of the borehole gas flow curve,There is no difference in the trend and magnitude of the trend,and at the same time meet the law of the attenuation ofthe borehole gas flow,that is,exponentially decay,indicating that the predicted permeability reflects the real situationof the gas flow in the coal seam.