Down-hole incident treatment and prevention for the 3000m scientific deep borehole in southern Hunan
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摘要: 湘南3000 m科学深钻为湖南首个3000 m地质岩心钻探特深孔,位于复杂褶皱转折带,钻遇了粘土缩径、全孔漏失、水敏性坍塌缩径和垂直节理发育坍塌等多种复杂地层,发生多次孔内事故。针对卡钻和塌孔等主要孔内事故,优化钻孔结构、冲洗液体系和钻具组合,采用侧钻绕障、循环捞砂、成膜冲洗液护壁和水泥浆护壁等多种技术措施,有效应对施工中的各种难题。终孔孔深3008.93 m,平均岩心采取率98.16%,实现了预期目标,为该区深部矿产成矿理论研究及资源勘查,提供了合格的地质钻孔和实物岩心资料。Abstract: The 3000m scientific deep borehole in southern Hunan is the first 3000m geological core drilling extra-deep hole in Hunan province. It is located in the transition zone of complex folds, and many complex formations, such as borehole shrinkage in clay, total hole leakage, water-sensitive collapse shrinkage and vertical joint development collapse, have been drilled, resulting in many down-hole incidents. In view of the main down-hole incidents such as bit sticking and hole collapse, the drilling structure, drilling fluid system and drill assembly were optimized, and various technical measures were adopted to effectively deal with various difficulties in drilling, such as sidetracking, circulating sand bailing, wall protection with film forming drilling fluid and wall protection with cement slurry. The final hole depth is 3008.93m, and the average core recovery rate is 98.16%, which has achieved the expected goal. Qualified geological boreholes and physical core data are provided for the theoretical study of deep mineral mineralization and resource exploration in this area.
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