Improved nozzle bore for PDC bits

摘要

A PDC (Polycrystalline Diamond Compact) drill bit has a fluid plenum 504 connecting a fluid inlet to at least one fluid orifice 502, a ledge 506 formed between a bottom of the fluid plenum 504 and the at least one fluid orifice 502 including at least one relief region 701. The relief region 1101 is formed at an angle determined by rotating clockwise about a fluid orifice axis 502 from a datum plane 601 in order that an improved of flow angle may occur. Additionally, a method to improve a polycrystalline diamond compact drill bit body design includes determining the flow change angles from a fluid plenum into a fluid orifice and modeling a relief region on a ledge to optimize fluid into the fluid orifice.