Wells – Valves – closures or changeable restrictors – Fluid operated
Patent
1984-08-29
1986-08-05
Novosad, Stephen J.
Wells
Valves, closures or changeable restrictors
Fluid operated
166323, 277124, E21B 3410
Patent
active
046037403
ABSTRACT:
A tubing retrievable surface controlled subsurface safety valve having a rotatable ball-type flow closure element is disclosed. A tubular operator assembly imparts longitudinal movement to the ball greater than the predetermined movement required to effect the desired ball rotation. The ball element is normally maintained by a closing spring arrangement and is rotated open by increased control fluid pressure. Camming slides on the ball rotation pins reduce contact stress during ball operation.
A locking sleeve having a longitudinal locking movement greater than the predetermined movement to rotate the ball open is provided. Operating movement of the locking sleeve uncovers a control fluid port for operating a supplemental subsurface valve operably secured with the valve. Prior to activating the locking sleeve to install the supplemental valve, the valve may be controlled by control fluid pressure communicated into an expansible chamber. The chamber is formed by two pairs of seals located on different diameters and at opposite ends of an operator sleeve guide member. The guide member contains both pairs of seals against extrusion from extreme pressure differentials. The seals are pressure energized and the seals of each pair are faced in opposite directions to maintain sealing integrity under all pressure differential operative conditions.
REFERENCES:
patent: 2525747 (1950-10-01), Hess
patent: 3519280 (1970-07-01), Genz
patent: 3821962 (1974-07-01), Mott
patent: 3882935 (1975-05-01), Calhoun
patent: 3896876 (1975-07-01), Crowe
patent: 3901321 (1975-08-01), Mott
patent: 4077473 (1978-03-01), Watkins
Carter Mark L.
Edwards Jon L.
Bui Thuy M.
Hydril Company
Novosad Stephen J.
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