煤田地质与勘探2017，Vol.45Issue(6)：28-33,6.DOI:10.3969/j.issn.1001-1986.2017.06.005
钻孔瓦斯压力恢复法求解煤层透气性系数
Borehole gas pressure build-up to evaluate the permeability of coal seam
摘要
Abstract
The permeability of coalbed benefits the fight evaluation of gas drainage capability,which could be used to select the suitable technique to increase the permeability and drainage effect.The permeability of coalbed is evaluated referring to the theory and experience of gas pressure build-up in the well testing.The gas flow model appropriate to the underground coal mine has been set up.The starting point of radial flow in the pressure build-up curve could be designated rationally using the double and half logarithmic pressure build-up curves with the analytic method of half logarithmic straight line.Therefore the slope of the interim radial flow section and the permeability of the coalbed could be determined accurately.After the verification and comparison with the result of in-situ examples by the radial flow method,the relative error of the five examples was between 13％ and 36.6％ and the average was lower than 24.62％.So the permeability of coalbed by the borehole gas pressure build-up curve is practical.关键词
钻孔瓦斯压力/压力恢复法/半对数直线段分析法/径向流段/煤层透气性系数Key words
gas pressure in the boreholes/pressure build-up method/semi-log linear section analysis/radial-flow section/permeability coefficient of coal seam分类
矿业与冶金引用本文复制引用
雷文杰,雷建伟,杨宏民,王兆丰..钻孔瓦斯压力恢复法求解煤层透气性系数[J].煤田地质与勘探,2017,45(6):28-33,6.基金项目
国家自然科学基金项目(51374094) （51374094）
河南省杰出创新科技人才计划(104100510002)National Natural Science Foundation of China(51374094) （104100510002）
Foundation Plan for Talented Scientists by Henan Province(104100510002) （104100510002）
