摘要
甘肃金川公司坑道小口径岩心钻探施工存在地质条件差,施工效率低,新开展的二矿区深部找矿钻探工程普遍月台效不超过150 m,钻孔事故率和报废钻孔多。主要原因是钻遇蚀变地层时围岩压力大和钻孔涌水造成的孔壁失稳引发的孔内事故多,泥浆护壁效果不理想,扫孔经常会发生钻具断裂和出现新孔现象,施工孔深大于300 m的钻孔时普遍会遇见卡钻、埋钻事故。本文依据该矿区施工经验提出钻遇高应力、蚀变性强的复杂地层时的经济实用处理方法:跟管钻进、泥浆调配、高压注浆及卡钻事故处理。其中,高压注浆在小口径岩心钻探复杂地层施工中应用较少,在合适的地层通过注浆既可以减少套管使用数量,还可以提高孔壁稳定性,是一种实用性强和值得推广的技术方法。
The construction of small diameter core drilling in the tunnel of Gansu Jinchuan Company has poor geological conditions and low construction efficiency.The newly launched deep ore exploration drilling project in the second mining area generally has a meterage per rig‑month of no more than 150m,and there are many drilling accidents and scrapped boreholes.The main reason is that there are many accidents in the hole caused by the high pressure of the surrounding rock and the instability of the hole wall caused by water gushing during drilling in the altered formation.The effect of mud wall protection is not ideal,and drilling tool breakage and new hole phenomena often occur during hole cleaning.When drilling with a depth of more than 300m,it is common to encounter stuck or buried drilling accidents.Based on the construction experience of the mining area,this article proposes economic and practical treatment methods for drilling in complex formations with high stress and strong corrosion:drilling with casing,mud mixing,high‑pressure grouting,and handling of stuck drilling accidents.Among them,high‑pressure grouting is rarely used in the construction of complex formations in small diameter core drilling.In suitable formations,grouting can not only reduce the number of casing used,but also improve the stability of the hole wall.It is a practical and worth promoting technical method.
作者
陶归成
张永昇
苗朝阳
王少强
TAO Guicheng;ZHANG Yongsheng;MIAO Chaoyang;WANG Shaoqiang(Baiyin Mineral Exploration Institute,Gansu Nonferrous Metal Geological Exploration Bureau,Baiyin Gansu 730900,China;Jinchuan Group Co.,Ltd.,Jinchang Gansu 737100,China;Hunan Provincial Land and Space Survey and Monitoring Institute,Changsha Hunan 410000,China)
出处
《钻探工程》
2023年第S01期281-285,共5页
Drilling Engineering
关键词
坑道钻探
跟管钻进
高压注浆
卡钻事故
涌水
tunnel drilling
drilling with casing
high pressure grouting
stuck drill accidents
water gushing
