Analytical research on rock fragmentation resistance while drilling with small-sized diamond cutters

Abstract:

Drilling is a process of rock fragmentation practically. In the rock fragmentation process， on the one hand， the bit fragments the rock， on the other hand， the rock resists the fragmentation. Both aspects should be considered. In the past， the research on how drill bits fragment rocks has been extensive， but research on how rock resists fragmentation is insufficient. Impregnated diamond bits can be used to drill rocks with drillability grades 6 to 12. Their application scope is wide. Impregnated bits usually contain small-sized diamond cutters. Russian drillers have studied rock fragmentation resistance during drilling with small-sized diamond cutters and proposed using the resistance coefficient to analyze how rocks resist fragmentation. Understanding this coefficient can help address issues such as the dependence of technical indexes on drilling parameters， how to improve drilling results， what kind of state the rock fragmentation is in and to determine how to increase technical and economic indexes of drilling and so on. In China， the research on the resistance coefficient is insufficient and there are no relevant research reports. Therefore the research has certain reference value and practical significance. It is suggested that this research topic be explored to confirm its importance in improving the results of rock fragmentation and increasing the technical and economical indexes of drilling engineering in China.