王家庄北沟多金属矿区钻探施工技术

Drilling technology for the Beigou polymetallic mining area in Wangjiazhuang

在河北省承德县王家庄北沟钼多金属矿钻探施工中,钻遇岩石以燧石条带白云岩、石英岩为主,岩石可钻性级别高,钻遇地层硬、脆、碎,钻头打滑严重,孔壁坍塌和漏失,钻进效率极低。为提高钻进效率,经取样分析岩性后,专门定制了适用于该地层的钻头。采用了多种方法迫使钻头出刃,并根据不同孔段地层岩性选择不同钻进工艺参数和钻井液体系。总结出适于本矿区地层的钻进工艺参数,使用不同性能的钻井液,起到了较好的护壁堵漏作用,提高了钻进效率。

In drilling at Beigou Molybdenum Polymetallic Mine,Wangjiazhuang,Chengde County,Hebei Province,the main rock encountered was chert strip dolomite and quartzite with strong drillability,and they were hard,brittle,broken and seriously slippery,leading to very low drilling efficiency.In order to improve drilling efficiency,the lithology was assayed through sampling the rock with the drill bit custom-made for the formation.A variety of methods were adopted to force exposure of the cutting elements,and different drilling parameters and drilling fluid systems were selected for the lithology over different sections of the borehole.This paper summarizes the drilling parameters suitable for the formation in this mining area,together with the drilling fluids of different performance for wall protection and leakage plugging,and higher drilling efficiency.