The authors are grateful for the financial support from the Natural Science Foundation of China(NSFC)(No.50874095,No.51174173 and No.51374176);the China National Science and Technology Major Project(No.2011ZX05050);Graduate Innovation Foundation of College of Mechatronic Engineering,Southwest Petroleum University(No.CX2014SZ03).Without their support,this work would not have been possible.
Particle Impact Drilling(PID)is a novel method to improve the rate of penetration(ROP).In order to further improve the performance of PID,an investigation into the effect of single and double particles:(1)diameter;(2)...