Improved Nozzle Bore for PDC Bits

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, wherein the fluid orifice...

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Bibliographic Details
Main Authors JAMES L LARSEN, DWAYNE P TERRACINA
Format Patent
LanguageEnglish
Published 20.02.2008
Subjects
EARTH DRILLING
EARTH DRILLING, e.g. DEEP DRILLING
FIXED CONSTRUCTIONS
MINING
OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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Summary: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, wherein the fluid orifice entrance area is at least 20% larger than the nozzle entrance area. The relief region 701 is formed at an angle of between 20 and 360 degrees as determined by rotating clockwise about a fluid orifice axis 502 from a datum plane 601. There may be more than one relief region present (1101, 1301, fig 13) and the relief region may be of a swept configuration (1601, fig 16). A method to improve a polycrystalline diamond compact drill bit body design by determining flow change angles from a fluid plenum into a fluid orifice and modelling a relief region on a ledge to optimize fluid into the fluid orifice is also included.
Bibliography:Application Number: GB20070022351