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

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.