Normally closed retainer valve with fail-safe pump through capab

Details Normally closed retainer valve with fail-safe pump through capab Normally closed retainer valve with fail-safe pump through capab

1996-11-26

1998-07-21

Schoeppel, Roger J.

Wells

Submerged well

Means removably connected to permanent well structure

166320, 166324, 1663323, 166363, 166375, E21B 33035

Patent

active

057823049

ABSTRACT:
A retainer valve provides increased safety in wellsite operations. In a preferred embodiment, operation of the retainer valve may be responsive to control line pressure or to tubing pressure. The retainer valve response is controlled by several factors, among which are relative tubing and balance line pressures, and axial positions of a number of pistons relative to a tubular J-slot member. If the control and balance lines are disconnected, or otherwise unavailable for operation of the valve, it may still be operated by manipulation of the tubing pressure at the earth's surface. Thus, the valve may be opened in emergency situations in which the control and balance lines are unavailable, but operation of the valve is still needed in order to safely relieve trapped pressure in the tubing string and/or to kill the well, unlatch a subsea test tree, etc. The retainer valve is also useful as a lubricator valve.

REFERENCES:
patent: 4253525 (1981-03-01), Young
patent: 4522370 (1985-06-01), Noack et al.
patent: 4636934 (1987-01-01), Schwendemann et al.
patent: 4658904 (1987-04-01), Doremus et al.
patent: 4880060 (1989-11-01), Schwendemann et al.

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