洛宁上宫金矿ZK322000深孔复杂地层护壁技术探讨

Discussion on the Wall Protection Technology for ZK322000 Deep Hole in Complex Stratum of Shanggong Gold Deposit in Luoning

摘要:

洛宁上宫金矿地层复杂，存在多层断裂构造破碎带，地层主要为硅化蚀变碎裂安山岩、碎裂片麻岩类与构造角砾岩，钻进过程中易出现孔壁坍塌、缩径等现象。ZK322000深孔钻探过程中既遇到了覆盖层采空区碎矿渣地层，也遇到了断层带水敏地层与坍塌破碎地层等复杂地层，针对该孔地层特点，通过采空区长套管护壁与水敏地层的抑制性泥浆体系护壁及坍塌地层的高密度泥浆体系护壁，成功解决了孔壁失稳问题，从而保证了钻孔质量。

Abstract:

The strata are complex in Shanggong gold deposit with multilayer fracture zones, the main formations are silicified altered shattered andesite, cataclastic gneisses and tectonic breccia, the wall collapse and diameter shrinkage are easy to occur during drilling process. In ZK322000 deep hole drilling process, not only the overburden gob broken slag formation, but also the complex strata such as fault zone water sensitive and collapse strata were encountered. In view of the strata characteristics, through the wall protection by long casing for goaf, inhibitive mud system for water sensitive stratum and high density mud for collapse stratum, the hole wall instability is successfully solved to ensure the quality of drilling.