E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 17/10 (2006.01)
Patent
CA 2567346
A fitting for engagement with a drill string or further fitting comprising an inner section for securement to a drill string or further fitting and an outer section for securement about the inner section and rotatable relative thereto. A bearing is located between the inner section and outer section. Seals are provided at either end of the fitting between the inner section and outer section and pressure compensating means for maintaining the pressure within the bearing substantially the same as the external pressure. The bearing comprises a layer of friction reducing material.
Fernandes Denis Robert
Murray Geoffrey Neil
Mcfadden Fincham
Weatherford/lamb Inc.
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