水力压裂技术在王行庄煤矿的应用

摘要

针对王行庄矿二1煤层透气性、瓦斯预抽率低等问题，提出了水力压裂增透技术，分析了水力压裂增加煤层透气性机理，确定了水力压裂工艺及参数，并在二1煤层11091运输巷进行了水力压裂技术试验。结果表明：实施水力压裂后，煤层瓦斯平均抽采浓度提高了5．3倍，瓦斯抽采量提高了6．1倍，提高煤层透气性和瓦斯抽采率的效果较理想。%Because of poor permeability and low gas extraction rate of Ⅱ 1 coal seam at Wang‐xing Village mine ,the hydraulic fracturing permeability improvement technology is proposed .The mechanism on permeability improvement by hydraulic fracturing is analyzed ,then the process and parameters of hydraulic fracturing are determined .Finally ,hydraulic fracturing experiment was conducted at 11091 haulage roadway of Ⅱ 1 coal seam .Results showed that the average concentration of gas extraction increased 5 .3 times and the total quantity of gas extraction increased 6 .1 times after the implementation of hydraulic fracturing . Consequently ,the technology of hydraulic fracturing has perfect effects on improvement of permeability and gas extraction rate .