金刚石粒度和浓度对孕镶金刚石钻头钻进岩石适应性研究OA

In response to the high wear resistance and high efficiency requirements of impregnated diamond bits in hard and abrasive formations in deep drilling,this paper systematically studies the effects of diamond particle size and concentration on flexural strength and wear ratio of diamond-containing composites,and carries out comparative drilling tests on Tiangang White(strongly abrasive medium-hard rock),Sesame Black(strongly abrasive hard rock),and Red Sandstone(weakly abrasive medium-hard rock).The results show that wear resistance is mainly controlled by concentration,and in drilling tests under different rock conditions,the influence patterns of particle size and concentration on rate of penetration(ROP)and working layer wear per unit footage differ significantly.In Tiangang White rock samples,coarser particles combined with moderate concentration are more favorable for improving mechanical drilling speed;in Sesame Black samples,finer particles combined with moderate concentration are more favorable for balancing drilling speed and wear resistance;in Red Sandstone,medium particle size combined with higher concentration is more favorable for leveraging the advantage of high cutting point density.Furthermore,a secondary regression model can well characterize the trend of the effects of particle size and concentration on rate of penetration,with regression results generally consistent with experimental observations.The research results can provide a reference for parameter optimization and performance prediction of impregnated diamond bits under different rock conditions.