Shrink-fit sleeve assembly for a drill bit, including nozzle assembly and method therefor
AssigneeBaker Hughes Incorporated
InventorsJames Andy Oxford, John H. Stevens, James L. Duggan, Redd H. Smith
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Abstract
A shrink-fit sleeve assembly comprising a bit body includes at least one sleeve port with a substantially tubular sleeve disposed therein and interferingly engaged therewith. The sleeve port includes an internal surface of substantially circular cross-section, and the tubular sleeve includes an internal nozzle port and an external surface of substantially circular cross-section. A lateral dimension of an external surface is equal to or greater than a first dimension at ambient temperature. A nozzle assembly and a method of manufacturing or retrofitting a drill bit are also disclosed.
Claims28
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.
A nozzle assembly for a drill bit for subterranean drilling, the nozzle 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 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 an interior wall of the internal nozzle port and an external surface of substantially circular cross-section, the external surface 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 the insertion of the tubular sleeve into the at least one sleeve port;
- and
- a tubular nozzle comprising an erosion-resistant material and disposed in the internal nozzle port, the tubular nozzle having threads on an outer wall of the tubular nozzle engaged with the threads on the interior wall of the internal nozzle port, having 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.
Dependencies are inferred from the claim text.