Wells – Valves – closures or changeable restrictors – Fluid operated
Patent
1989-05-19
1990-08-07
Dang, Hoang C.
Wells
Valves, closures or changeable restrictors
Fluid operated
166332, 251 634, E21B 3410
Patent
active
049459937
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, a small diameter offset piston to move the operator tube in response to control fluid pressure conducted from the well surface, and a spring biasing the operator tube to a position closing the valve. A bearing assembly mounted on the operator tube minimizes eccentric and torsional loading of the operator tube by the piston and spring. The operator tube also has multiple flow paths and barriers to prevent accumulation of debris from well fluids within the safety valve. The safety valve has metal-to-metal sealing systems to improve valve life under harsh downhole well environments.
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Otis Drawing 7800121.
Dickson Rennie L.
Smith Roddie R.
Dang Hoang C.
Felger Thomas R.
Otis Engineering Corporation
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