Casing hanger running tool using string weight

Details Casing hanger running tool using string weight Casing hanger running tool using string weight

1988-12-16

1990-05-29

Novosad, Stephen J.

Wells

Processes

Placing or shifting well part

166 82, 166182, 166242, 166387, E21B 2302, E21B 4310

Patent

active

049287699

ABSTRACT:
A tool for setting 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 setting sleeve is carried by the body for connection to the packoff. A setting 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 a setting sleeve piston and contain an incompressible fluid. Downward movement of the mandrel causes the pressure to increase to drive the setting sleeve piston downward to set the packoff.

REFERENCES:
patent: 3897823 (1975-08-01), Ahlstone
patent: 3933202 (1976-01-01), Ahlstone
patent: 4674576 (1987-06-01), Goris et al.
patent: 4712621 (1987-12-01), Wightman et al.
patent: 4736799 (1988-04-01), Ahlstone
patent: 4757860 (1988-07-01), Reimert
patent: 4811784 (1989-03-01), Theiss

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