甘肃金山矿区复杂地层钻探施工技术

摘要

甘肃省礼县金山矿区地质构造背景复杂,断裂构造非常发育,地层岩性以千枚岩为主,水敏性强,致使该矿区钻孔孔壁不稳定,加大了钻探施工难度.总结施工经验认为:采用抑制性泥浆和套管相结合的办法解决水敏性、破碎地层护壁问题可以取得较好效果.%The geological structure background is complicated in Jinshan gold deposit area,Li county,Gansu Province,and the fracture structures are well developed.The strata domained by phyllite.The strong water sensitivity in the strata results in unstable drillhole wall and thus drilling operation is very difficult.According to the practical drilling experience,it is concluded that the drilling operation in combination with inhibitive mud and casing of way can solve the problem of water sensitivity and drillhole wall protection,and achieved good drilling effect.