Experimental Research on Reverse Circulation Drilling Technology with DTH Air Hammer Drill Bits in Complex Strata in Xiaoqinling Area

Abstract:

The technology of reverse circulation continuous coring drilling with hollow-through DTH hammer has shown lots of peculiarities, such as the high drilling efficiency, good quality of borehole and low drilling cost, especially the unique adaptability while drilling in complex strata. In this paper, series of field tests have been conducted on the basis of optimized configuration of reverse circulation drill bits and drilling tools according to Tiancheng gold mine drilling project in Xiaoqinling area. The tests results have shown that the modified drilling system with hollow-through DTH hammer could be of high adaptability to drilling in complex conditions, which could effectively solve the problems of drilling in this ore district. What’s more, the results contribute to the further innovative research on the mechanism theory of hollow-through DTH hammer and the structural design of reverse circulation drilling bits. In addition, it could provide technical supports for the reasonable optimization of hollow-through DTH hammer and drilling tools configuration to achieve the high efficiency, low cost, short period and superior drilling effect in complex geological conditions.