穿层钻孔各煤层瓦斯抽采比例计算方法及应用

Calculation method of gas extraction ratio from different seams in crossing holes and its application

为了测定穿层钻孔多煤层瓦斯抽采各煤层瓦斯抽采比例及残余瓦斯含量,分别提出了相应的解决方法。计算穿层钻孔多煤层瓦斯抽采各煤层瓦斯抽采比例时,提出将煤层厚度、原始瓦斯含量、透气性系数的乘积作为瓦斯抽采相关量,将瓦斯抽采相关量归一化处理来计算,考虑了影响穿层钻孔瓦斯抽采的主要因素;预测穿层钻孔多煤层瓦斯抽采各煤层残余瓦斯含量时,利用原始瓦斯含量与吨煤瓦斯抽采量来计算,吨煤瓦斯抽采量与穿层钻孔瓦斯抽采总量、穿层钻孔在该煤层的瓦斯抽采比例及该煤层的质量有关。结果表明:提出的穿层钻孔多煤层瓦斯抽采各煤层瓦斯抽采比例计算方法,与贵州省青龙煤矿现场实测结果的最大相对误差仅为2.03%,能够满足工程实践的需要。

To measure the gas extraction ratio and the residual gas content of different seams during gas extraction of multiple seams through crossing boreholes, the paper put forward the corresponding solutions respectively. It was proposed that when calculating the gas extraction ratio of different seams during gas extraction of multiple seams through crossing boreholes, the product of the seam thickness, the primitive gas content and the permeability coefficient were used as the correlative parameter of gas extraction, Determining the multi-seam gas extraction borehole gas extraction ratio of each layer, proposed coal seam thickness, the original gas content, the product of permeability coefficient as the amount of extraction-related, the extraction-related normalized is calculated,considering the main influence factors of penetration borehole gas extraction. When prediction residual gas content of penetration borehole extraction multi-seam gas, the original gas content and gas extraction volume of each ton were used, gas extraction volume of each ton is related with penetration borehole total gas extraction quantity, gas extraction ratio in the coal seam, and the coal seam reserves. The results showed, the method multi-seam gasextraction borehole gas extraction ratio of each layer proposed, the maximum relative error is 2.03% compared with measured results on site, can meet the need of engineering practice.