小秦岭金矿田3500 m特深孔冲洗液技术

The drilling fluid technology of 3500m extra‑deep hole in Xiaoqinling Gold Field

小秦岭金矿田3500 m特深孔(ZK001孔)位于河南省灵宝市,是小秦岭构造带上深部探测的第一口全孔连续取心特深钻孔,该钻孔地层岩性十分复杂,软、硬、碎地层交互出现,护壁极其困难,钻进中伴随孔壁坍塌、掉块、水化分解造浆、高地应力断层泥缩径和微裂隙失水等多种复杂工况。本文针对地层变化调整冲洗液体系,上部采用低固相冲洗液,下部采用低固相聚合物防塌冲洗液体系,不断优化冲洗液配方,及时维护调整性能参数,有效解决了孔内各种难题。为小秦岭地区提供了一种可靠的深孔岩心钻探冲洗液技术。

The 3500m extra‑deep hole(ZK001 hole)in Xiaoqinling gold mine field is located in Lingbao City,Henan Province.It is the first full‑hole continuous coring extra‑deep hole in the Xiaoqinling tectonic belt.The formation lithology of this hole is very complicated,with soft,hard and broken strata appearing interactively,and the wall protection is extremely difficult.There are many complicated conditions in drilling,such as hole wall collapse,block loss,hydration decomposition and pulping,high in‑situ stress gouge shrinkage and micro‑fracture water loss.In this paper,the flushing solution system is adjusted according to the formation changes.The upper part uses low solid phase flushing solution and the lower part uses low solid phase polymer anti‑collapsing flushing solution system.The flushing solution formula is constantly optimized,the performance parameters are timely maintained and adjusted,and various problems in the hole are effectively solved.It provides a reliable flushing fluid technology for deep hole core drilling in Xiaoqinling area.