地质钻探中孔内复杂情况的应对措施

钻探是为地质工作取得一手资料所采取的直接有效的手段。钻探工作中经常遇到地层渗漏、孔壁坍塌、钻孔缩径等复杂地质情况,由于孔壁的不稳定,常会出现卡钻、埋钻事故。若不及时治理,就可能造成孔内事故频繁发生,处理时间过长,或将导致钻孔报废。为了快速、安全、准确的钻探取心,就要从最初钻探设计时便开始采取＂预防为主,防治结合＂的原则。结合上宫金矿等实例,总结出钻前预留一级孔径、钻中采用套管与钻井液堵漏等方法,为后续钻进工作达到又快又好的效果,提供一些技术参考。

Discussion of the Solutions to the Borehole Accident in Geological Drilling

Drilling is a direct and effective means for getting geological material.During the drilling period,the complex conditions are frequently encountered such as strata leakage,hole wall collapsing and diameter shrinking,etc.Due to the unstable borehole wall,drill sticking and burying often happen.If it is not timely and properly treated,borehole scrap would be inevitable.In order to get the core fast,safe and accurate,the rule ＂prevention first,prevention treatment combination＂ should be obeyed from the initial design.With the case of Shanggong gold mine,the principle of one level diameter reserved before drilling and drilling with casing drilling fluid plugging were summarized,which could be the technical reference for the subsequent drilling work.