青海省祁连县红川矿区钻探施工初探

Discussion of Drilling Construction in Hongchuan Mining Area of Qinghai

青海地区海拔高、无霜期短,4000 m以上海拔常年存在20 m不等的永冻层,在该地层钻进过程中受冲洗液冲刷和钻杆高速转动摩擦产生热量等因素影响,化冰过程中产生地层溶蚀,进而逐渐崩坍,造成钻进难、成孔难;加之气温低造成高分子溶解困难,冲洗液流变性差,性能难以发挥。通过改进开孔钻具接头和优化冲洗液性能,较好地解决了高原矿区施工难题。重点介绍了钻具接头的改进以及现场冲洗液技术。

High altitude, short frost-free period and about 20m thick permafrost at 4000m above sea level are the character- istics in Qinghai area, where drilling is difficult because of the influence of flushing fluid and heat produced by high-speed rotary friction of drill pipe. Formation dissolution and collapsing occurred in the process of ice melting, and in addition to difficult polymer dissolution at low temperature, the rheology performance is affected. By improving the drilling tool joints and optimizing drilling fluid performance, construction difficulties were solved. The paper introduces the improvement of s and the flushing fluid technology.