Patent ID: 7188682
Filing Date: 2007-03-13
Classification: E21B

Abstract:
1. A drill bit, comprising: a drill bit body forming an interior plenum, a pin end suitable for connection to a drill pipe with an internal passageway therethrough, and a cutting end suitable to cut a borehole; a multi-stage diffuser nozzle assembly attached to said drill bit body and in fluid communication with said interior plenum, said multi-stage diffuser nozzle assembly comprising, a flow restrictor component in fluid communication with said interior plenum, said flow restrictor component having at least one internal passage to carry fluid, said interior passage having a throat with an effective cross-sectional area A an axis through said fluidic distributor component wherein a first fluid exit port on said fluid exit side of said fluidic distributor component is disposed to direct said fluid generally along a line that is non-collinear with said axis.