Mechanical analysis of water jets assisting PDC bit to cut rocks

Based on the mechanical analysis of water jets assisting PDC bit to cut rock, the effects of water jets on the PDC bit forces are investigated. The following results are obtained from the experiments. The bit forces increase with the cutting depth while water jets assisting PDC bits to cut the hard rock. When water jets is directed from the bottom and offset of PDC bit, the bit forces have a great decrease. The force reduction is about 30 % to 52 %. Moreover, the change of cutting depth does not have much influence on this force reduction.