Patent ID: 6254275
Filing Date: 2001-07-03
Classification: E21B,F16C

Abstract:
A drill bit for use in an earthen annulus that contains loose particles, the drill bit connected to a fluid supply source comprising:a bit body having at least one journal segment, said bit body further having at least one fluid conduit in fluid communication with the fluid supply source;a roller cone rotatably mounted upon said journal segment and forming at least one bearing cavity therebetween;an annular primary seal disposed between said roller cone and said bit body and between said bearing cavity and the earthen annulus;an annular gap disposed between said roller cone and said bit body and between said annular primary seal and the earthen annulus, said annular gap in fluid communication with said fluid conduit and the earthen annulus; andan annular secondary seal disposed between said annular primary seal and the earthen annulus, said annular secondary seal being primarily radially energized.