“三软”低透气性难抽煤层水力压裂增透技术研究

摘要

In order to solve the problem of short drainage period , fast attenuation of drainage concentration , low methane drainage a-mount after drill-hole construction , hydro-fracture was applied in 21121 floor drainage roadway of Daping Colliery.Several months ob-servation and comparison with data from areas without hydro-fracture showed that hydro-fracture could add permeability in drill-holes, made drainage concentration attenuation time increase and methane drainage amount increase largely .After hydro-fracture, dust quantity of drill-hole reduced obviously in other drill-hole construction.%“三软”低透气性煤层抽放钻孔施工过后，钻孔抽放周期短、抽放浓度衰减快、瓦斯抽放量低一直是困扰煤与瓦斯突出矿井的一个难题，为解决这一难题。大平矿在21121底板抽放巷采取了水力压裂增透卸压技术，通过几个月以来的观测，对水力压裂影响区域及未采取水力压裂措施区域抽放浓度进行对比分析，采取水力压裂措施后，能够有效增加钻孔的透气性，使钻孔抽放浓度衰减时间增长，瓦斯抽放量得到大幅提高，并且在水力压裂过后，施工其余钻孔期间，钻孔的产尘量明显降低。