E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/12
E21B 7/00 (2006.01) E21B 4/00 (2006.01) E21B 4/02 (2006.01)
Patent
CA 2033779
An improved sealing system for a sealed bearing assembly used in earth drilling. The bearing assembly has a first tubular member, and a second tubular member telescopically received in the first tubular member. The second tubular member has an interior passage through which drilling fluids pass under pressure from on surface pumps. A clearance space is provided between the first tubular and the second tubular member defining a lubricant filled bearing chamber. The improvement is in the seal at a pump end of the bearing chamber which consists of a first floating piston, a second floating piston spaced from the first floating piston, and a fixed seal intermediate the first floating piston and the second floating piston. A first chamber is provided between the first floating piston and the fixed seal. The first chamber is filled with lubricant. A second chamber is provided between the fixed seal and the second floating piston. The chamber has a passage to external of the first tubular member. The differential in pressure between the first chamber and the second chamber is sealed by the fixed seal.
Foote Dean
Wenzel Kenneth Hugo
Dreco Energy Services Ltd.
Foote Dean
Thompson Douglas B.
Wenzel Kenneth Hugo
LandOfFree
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