Patent ID: 7681668
Filing Date: 2010-03-23
Classification: E21B,Y10T

Abstract:
1. A shrink-fit sleeve assembly for a drill bit for subterranean drilling, the shrink-fit sleeve assembly comprising: a bit body comprising at least one sleeve port of substantially circular cross-section therein, the at least one sleeve port having an internal surface; a substantially tubular sleeve of substantially circular cross-section disposed in and solely interferingly engaged with the at least one sleeve port of the bit body, the tubular sleeve comprising an internal nozzle port having threads on a wall of the internal nozzle port of the tubular sleeve and having an external surface of substantially circular cross-section having a lateral dimension equal to or greater than a lateral dimension of the internal surface along an identical cross-section prior to disposition interferingly into the at least one sleeve port when at ambient temperature, the external surface of the tubular sleeve having a chamfer thereon for insertion of the tubular sleeve into the at least one sleeve port; and a substantially tubular nozzle comprising an erosion-resistant material and disposed in the internal nozzle port having threads on an outer wall of the tubular nozzle engaged with the threads on the wall of the internal nozzle port, a portion of the tubular sleeve extending from an upper end of the tubular nozzle to the threads on the outer wall of the tubular nozzle.