Technical Difficulties of Thick Overburden Layer Drilling in Xiaoqinling Gold Mine and the Countermeasures

Abstract:

The analysis is made on the technical difficulties of thick overburden layer drilling in Xiaoqinling gold mine; the technical countermeasures are researched to solve the problems in thick overburden layer wire-line core drilling in the aspects of drilling methods, borehole structure, wall protection with mud and process measures, which have brought good effects in the practice.