内蒙古曹四夭钼矿复杂地层深孔钻探技术

Deep-hole Drilling Technology in Complex Formation in Caosiyao Molybdenum Mine of Inner Mongolia

摘要:

针对内蒙古兴和县曹四夭钼矿区构造发育，地层坚硬、岩心破碎，以及钻孔缩径、漏失、坍塌、掉块等复杂情况，总结了该矿区“硬、脆、碎”复杂地层绳索取心深孔钻探施工技术经验，从钻孔结构、泥浆配置和冲洗液选取以及钻探设备、新型SYZX75 2（77）型绳索取心液动锤钻具等方面采取措施，解决了破碎漏失、坍塌掉块及坚硬“打滑”地层的难题。着重阐述了高强度快失水堵漏技术试验，改善了复杂地层的深孔钻进环境，提高了钻探生产效率，保证了钻孔的安全终孔。

Abstract:

According to the tectonic development in a molybdenum mining area of Inner Mongolia with complex geological conditions of hard formation, broken core, borehole diameter shrinkage, leakage, collapsing and block falling, the technical experiences of drilling construction for wire-line coring in hard, brittle and broken formations were summed up. Analysis was made on borehole structure, mud configuration, flush fluid selection, drilling equipment and new SYZX75 2 ( 77) type wire-line coring hydro-hammer drilling tool to solves the leakage, collapsing, block falling and drilling difficulties in hard “skid” formations. The paper emphatically elaborates the high strength dehydration blocking test, which can improve drilling conditions in complex formations and drilling production efficiency to ensure the drilling safety.