Method and apparatus for selective retraction of a tubing carrie

Details Method and apparatus for selective retraction of a tubing carrie Method and apparatus for selective retraction of a tubing carrie

1989-04-28

1990-12-25

Neuder, William P.

Wells

Processes

Perforating, weakening, bending or separating pipe at an...

166 55, 166383, E21B 4311

Patent

active

049795678

ABSTRACT:
An apparatus and method are provided for telescopically retracting a subterranean well tubing carried perforating gun. The retracting apparatus comprises a cylindrical housing which is carryable into the well on a tubular conduit, such as a work string, production string, or the like. A first chamber is provided within the housing and contains a body of fluid. Telescoping piston means are selectively releasably locked relative to the housing. A second chamber is in selective fluid flow communication with the first chamber. Means in communication with the piston means are provided for carrying the perforating gun. Means for communicating well pressure to the piston means are actuated upon firing of the gun. Means are provided for transferring the body of fluid from the first chamber to the second chamber, whereby during such transferring, the perforating gun is telescopically retracted relative to the housing.

REFERENCES:
patent: 4484628 (1984-11-01), Lanmon, II
patent: 4501331 (1985-02-01), Brieger

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