预飘措施在复杂地层中深孔钻探中的运用

Application of Pre-floating Measures in Deep-hole Drilling in the Complex Strata

银山铜铅锌金银多金属矿区的地层是以千枚岩为主的,由于千枚岩片理极为发育,产状变化大,因此,以往在中深孔钻探施工过程中,均存在着钻孔弯曲度超规范的情况,严重制约着钻孔质量。为了有效解决这一难题,提高钻孔质量和探矿效果,组织进行了技术攻关,采取以预飘为主的措施,取得较好成效。

The strata in Yinshan Au-Cu lead-zinc multi-metal mine are mainly in form of phyllite. Due to the complex schistosity of phyllite and big occurrence change,the degree of borehole curvature is over norms in deep-hole drilling construction process,which seriously hampered the drilling quality. In order to effectively resolve this problem and improve the drilling quality and exploration results, a technical breakthrough is made, where pre-floating measures are adopted with better results.