Well bore apparatus with annulus pressure releasable tubing seal

Details Well bore apparatus with annulus pressure releasable tubing seal Well bore apparatus with annulus pressure releasable tubing seal

1978-05-08

1980-02-12

Leppink, James A.

Wells

Packers or plugs

With expanding anchor

166125, 285 18, E21B 2304, E21B 1702

Patent

active

041879066

ABSTRACT:
Well bore apparatus is installed in a well casing on a tubular string having a packer anchored in and forming a seal within the casing. In the tubing string above the packer is a safety valve structure held open by the pressure of fluid supplied through control fluid tubing extending to the top of the well between the exterior of the tubing string and the casing. A long tubing seal structure has a lock releasable by the pressure of fluid supplied through the annulus, or alternatively by rotation of the tubing in an emergency.
The tubing seal structure is released to enable the tubing string to move freely in either direction, in response to pressure and/or temperature changes, whereby tension and compression reversals are eliminated. The tubing string above the sealing receptacle can be pulled from above the packer and other downhole structures. The hydraulic release is operable by annulus pressure to release the receptacle for longitudinal movement relative to a long sealing slick joint after testing of the packer.

REFERENCES:
patent: 2409811 (1946-10-01), Taylor, Jr. et al.
patent: 2978032 (1961-04-01), Hanna
patent: 3008523 (1961-11-01), Clark, Jr. et al.
patent: 3035642 (1962-05-01), Page
patent: 3037797 (1962-06-01), Brown
patent: 3870104 (1975-03-01), Mott
patent: 3920075 (1975-11-01), Braddick et al.
patent: 3934652 (1976-01-01), Cochran
patent: 4008759 (1977-02-01), Blackwell

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