E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 3/02 (2006.01) E21B 4/02 (2006.01) F04C 2/107 (2006.01) F16D 3/38 (2006.01)
Patent
CA 2044942
ABSTRACT A downhole drilling apparatus which includes a progressive cavity drive train comprising a progressive cavity device and a coupling for converting the complex motion of the rotor into simple rotation. The coupling includes two shafts coupled to one another by joint assemblies connected to opposite ends of an intermediate shaft. The joint assemblies include interleaved annular extensions from the opposite ends of the joint assembly and an elastomer filling the spaces between the annular extensions. The elastomer is highly restrained by the interleaved annular extensions, but is still flexible in shear. The moving components within the coupling are perfectly isolated from the surrounding environment; the joint assembly may further include backup features such as a thrust bearing member and radial pins locking the interleaved portions together.
Ide Russell D.
Swabey Ogilvy Renault
LandOfFree
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