E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 3/00 (2006.01) E21B 4/00 (2006.01) E21B 10/00 (2006.01) F16C 31/00 (2006.01)
Patent
CA 2049586
ABSTRACT A sealed bearing assembly for downhole drilling motors, which has a modular drop-in type construction. The sealed bearing assembly includes a housing portion which is secured to the drilling shaft and a housing portion which is secured to the casing. A bearing assembly extends between the two housing portions and the housing portions encase the bearing assembly and include a sealed construction which prevents the entry of drilling mud into the sealed assembly. A number of flow passages are provided in the rotating housing portion and/or the stationary housing portion so as to allow fluid to freely pass the sealed bearing assembly such that there is a negligible pressure drop across the sealed bearing assembly. The assembly also includes sealing portions on either side of the bearing assembly which preclude the entry of mud into the sealed bearing assembly. The sealing portions include a reservoir for pressurizing lubricating oil to at least the pressure of the drilling mud and causing the pressurized oil to lubricate the bearing and other components such as a mechanical face seal and then to provide a pressure to the inner end of a backup seal at either end of the assembly so as to prevent the flow of pressurized mud across the backup seal.
Ide Russell D.
Swabey Ogilvy Renault
LandOfFree
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