E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/62
E21B 31/00 (2006.01) E21B 33/043 (2006.01) E21B 33/00 (2006.01)
Patent
CA 2003348
A tool for setting or retrieving a packoff between the casing hanger and the wellhead utilizes differential area pistons. The tool has a mandrel which connects to a string of drill pipe. The mandrel carries a body and is axially movable relative to the body. A sleeve is carried by the body for connection to the packoff. A sleeve piston is carried by the body for relative movement relative to the body. A mandrel piston is carried by the mandrel for movement with the mandrel. Passages in the body communicate the mandrel piston with the sleeve piston and contain an incompressible fluid. Axial movement of the mandrel causes the pressure to increase to drive the sleeve piston downward to set the packoff, or in another embodiment, upward to retrieve the packoff.
Beitler Bradley D.
Mcghie Fergus D.s.
Milberger Lionel J.
Nobileau Philippe C.
Watkins Bruce J.
Abb Vetco Gray Inc.
Gowling Lafleur Henderson Llp
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