Successful Application of Hollow-through Type DTH Hammer Drilling Technique and Continuous Coring Technology with Reverse Circulation in Complicated Stratum

Abstract:

The natural environment in Baiganhu tungsten-Tin mine in Xinjiang is bad, and the geological conditions are complicated. At the beginning, the common small diameter diamond coring drilling is used, but the efficiency is low, the cost is high, and the construction period is long. Subsequently, the hollow-through type DTH hammer drilling technique and continuous coring technology with reverse circulation are adopted to experiment in this mine. According to the experiment results, the latter is better than the former in various technique indexes obviously. The productive experiment is successful. Aiming at some problems appeared in the experiment, the authors put forward some improvement suggestions.