Well fluid pressure balanced operator for subsurface safety valv

Details Well fluid pressure balanced operator for subsurface safety valv Well fluid pressure balanced operator for subsurface safety valv

1981-10-21

1984-09-04

Novosad, Stephen J.

Wells

Valves, closures or changeable restrictors

Fluid operated

166374, E21B 4312

Patent

active

044691807

ABSTRACT:
A surface controlled subsurface safety valve having rotatable ball-type closure elements and disclosed the tubular operator assembly is sealed to be substantially pressure balanced with respect to well fluid pressures when the ball-type closure is in either the open or closed position. Such arrangement enables the valve to be opened at a moderate control fluid pressure level with a substantial well pressure differential across the closed ball. In the disclosed tubing retrieval embodiment, an enclosed hydraulic system is used to balance the tubular operation and offset the hydrostatic head of the control fluid to enable greater setting depth.

REFERENCES:
patent: 3762471 (1973-10-01), Mott
patent: 3782461 (1974-01-01), Watkins
patent: 3860066 (1975-01-01), Pearce et al.
patent: 3901321 (1975-08-01), Mott
patent: 3993136 (1976-11-01), Mott
patent: 4144937 (1979-03-01), Jackson et al.
patent: 4193450 (1980-03-01), Fisher, Jr.

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