Pack-off bushing

Details Pack-off bushing Pack-off bushing

F - Mech Eng,Light,Heat,Weapons

16

L

F16L 7/02 (2006.01) E21B 23/02 (2006.01) E21B 33/13 (2006.01) E21B 33/14 (2006.01) E21B 43/10 (2006.01)

Patent

CA 2293095

A pack-off bushing for placement inside an outer conduit while a fluid is passed through an inner conduit positioned within the outer conduit. The bushing includes a mandrel having a mandrel passage extending axially therethrough, a housing carried on the mandrel and capable of axial movement relative to the mandrel and a balancing system associated with the mandrel and the housing for applying a balancing force to the mandrel to oppose an axial mandrel force applied to the mandrel.

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