Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
Patent
1988-02-16
1989-05-30
Massie, Jerome W.
Wells
Valves, closures or changeable restrictors
Longitudinally movable operator
166321, 251 89, E21B 3410
Patent
active
048341835
ABSTRACT:
A surface controlled subsurface safety valve for use in a well tubing string including a valve closure member, an operator tube for opening the valve closure member, an annular piston on the operator tube responsive to control fluid pressure conducted from the well surface, and a spring biasing the operator tube to a position closing the valve. A lockout sleeve mounted in tandem with the operator tube for movement to a position in which the lockout sleeve holds the valve open. The operator tube having multiple flow paths and barriers to prevent accumulation of debris from well fluids within the safety valve. One flow path including a plurality of small ports extending through the upper portion of the operator tube. Another flow path defined in part by a reduced outside diameter portion of the operator tube near its lower end and multiple channels in the valve housing adjacent thereto.
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Dickson Rennie L.
Hammett Robert C.
Hines Craig D.
Vinzant Michael B.
Felger Thomas R.
Massie Jerome W.
Melius Terry Lee
Otis Engineering Corporation
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