几内亚某超大型铝土矿含水地层钻探取样技术

[摘 要] 为解决在几内亚某特大型铝土矿矿区部分含水区域中钻探施工中出现的取样困难的问题,通过对含水钻孔地层的地质特征分析,将其分为三种类型,并据此研制和试验了两种不同的取样钻具:护带型螺旋钻具和可启闭防抽吸钻具。经过现场实验证明,护带型螺旋钻具适宜于第一种地质特征的钻孔,可启闭防抽吸钻具适宜于第二、三类地质特征的钻孔。在施工应用中,解决了在该矿区这类地层中钻探取样问题。

Sampling Technique of Drilling in Aquiferous Strata at a Super-Large Bauxite Deposit in Guinea

Abstract:Geological characteristics of the drilled aquiferous strata at a super-large Guinean bauxite deposit were investigated to address the samplingproblems encountered during the drilling process. The aquiferous strata of this area can be classified into three categories,based on which,two differentsampling devices were developed and tested,i. e. ,spiral drilling tool with ring quard and drilling tool of anti-suction with switchable mouth downside. The site tests indicate that the spiral drilling tool with ring quard is fit for the boreholes with the first category of geological features,while the drilling tool of anti-suction with switchable mouth downside is fit for the boreholes with the second and third category of geological features. These drilling tools have tackled difficulties in sampling of such strata in this deposit area.