CAVITATING LIQUID JET ASSISTED DRILL BIT AND METHOD FOR DEEP-HOLE DRILLING

摘要

CAVITATING LIQUID JET ASSISTED DRILL BIT AND METHOD FOR DEEP-HOLE DRILLING A drill bit and a method for deep-hole drilling in which the drill bit has-mechanical cutting means located on its lower cutting face for cutting a solid surface upon rotation of the bit and a plurality of cavitating liquid jet nozzles spaced around the face of the bit to assist in the drilling action, the nozzles being located so as to discharge a plurality of downwardly directed and concentric liquid jets that cavitate to fracture the surface to be drilled in a series of non-overlapping slots as the bit is rotated.