甘肃省阿克塞红柳沟铁矿钻探施工技术

Drilling construction technology for the Aksai Hongliugou Iron Ore Mine in Gansu Province

摘要:

甘肃省阿克塞红柳沟铁矿区地处高海拔区域，地层条件极为复杂、岩体完整性普遍较差，且矿区范围内广泛分布易水化膨胀的泥岩层系，导致钻探过程中极易发生孔壁缩径、地层坍塌及钻具卡埋等复杂孔内事故，造成钻探难度大、钻进效率低、工期延长。本文围绕复杂地层绳索取心安全高效钻进核心目标，系统开展综合技术体系研究。针对性优化钻孔结构设计以适应复杂地层变化规律、科学动态调控钻进参数以匹配不同岩层特性、研发并配制适配矿区岩性的分体系冲洗液以稳定孔壁、优化钻具组合形式以提升钻进适配性等多项技术措施集成应用。经现场工程实践验证，所构建的综合钻探技术方案展现出良好的适用性与有效性，成功攻克了该矿区复杂地层钻进技术难题，显著提升了钻孔成孔质量与施工效率，全孔岩心采取率均稳定满足设计要求，不仅为该矿区勘查工程的顺利实施提供了坚实的技术保障，同时也为我国西部面临相似复杂地层条件的金属矿钻探工程提供了可借鉴的技术参考。

Abstract:

The Hongliugou Iron Ore Mine in Aksai， Gansu Province is located in a high-altitude region with extremely complex stratum conditions and generally poor rock mass integrity. Widely developed mudstone strata in the mining area are prone to hydration and expansion when encountering water， which easily induces complex downhole accidents including borehole shrinkage， stratum collapse and drilling tool sticking and buried. These problems result in high drilling difficulty， low drilling efficiency and delayed construction period. Centering on the core goal of safe and efficient wireline core drilling in complex strata， this paper systematically researches and constructs a comprehensive technical system for drilling construction. A series of integrated technical measures are adopted， including targeted optimization of borehole structure design to adapt to the variation law of complex strata， scientific dynamic adjustment of drilling parameters to match the characteristics of different rock layers， development and preparation of zonal flushing fluid adapted to the local lithology to stabilize the borehole wall， and optimization of drilling assembly to improve drilling adaptability. Field engineering practice verifies that the constructed comprehensive drilling technical scheme has good applicability and effectiveness. It effectively solves the technical difficulties of drilling in complex strata of the mining area， significantly improves borehole forming quality and construction efficiency， and keeps the full-hole core recovery rate stably meeting the design requirements. The research results not only provide a solid technical guarantee for the smooth implementation of exploration engineering in the mining area， but also offer a feasible technical reference for metal ore drilling projects with similar complex stratum conditions in western China.