Roll stabilished unit

Details Roll stabilished unit Roll stabilished unit

E - Fixed Constructions

21

B

E21B 7/04 (2006.01)

Patent

CA 2547036

A roll stabilised unit comprises a tool housing (30) rotatably mounted within a tool collar (28), the tool housing (30) having rotatably mounted thereon a first impeller (36), a variable torque transmission arrangement (38) being provided to allow the torque transmitted from the first impeller (36) to the housing (30) to be controlled, and a second impeller (40) fixed relative to the housing (30) so as to be rotatable with the housing (30).

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