Wells – Valves – closures or changeable restrictors – Fluid operated
Patent
1983-02-03
1984-04-24
Purser, Ernest R.
Wells
Valves, closures or changeable restrictors
Fluid operated
166321, 251 634, E21B 3410
Patent
active
044442661
ABSTRACT:
A well safety valve for controlling the fluid flow through a well tubing in which at least one piston having a small cross-sectional area for reducing the effect of high hydrostatic forces controls the opening and closing of the valve. The piston has a piston rod extending upwardly from the piston for connection to the tubular member controlling the valve whereby the piston and piston rod are acted on in tension by hydraulic control fluid and avoids subjecting the small piston to compression loads. A stop is provided on the piston on the side remote from the upwardly extending piston rod for preventing compression loading on the piston in the event the tubing pressure is greater than the control fluid pressure. The connection between the piston rod and the tubular member includes at least one telescopically movable elongate member having a greater cross-sectional area than the piston rod and is connected between the piston rod and the tubular member. The elongate member is pressure balanced as to both the hydraulic control fluid and the tubing pressure in the valve bore. A lost motion connection is between the piston rod and the elongate member for allowing the piston to assist in closing the valve if necessary but avoiding compressional loads on the rod.
REFERENCES:
patent: 3986554 (1976-10-01), Nutter
patent: 4161219 (1979-07-01), Pringle
patent: 4373587 (1983-02-01), Pringle
Bui Thuy M.
Camco Incorporated
Purser Ernest R.
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