Balance line hydraulically operated well safety valve

Details Balance line hydraulically operated well safety valve Balance line hydraulically operated well safety valve

1984-08-27

1986-11-11

Novosad, Stephen J.

Wells

Valves, closures or changeable restrictors

Fluid operated

166324, 166325, 251 634, E21B 3410

Patent

active

046216952

ABSTRACT:
A well safety valve controlling flow through a well tubing using a hydraulic control line extending from the well surface to one side of an actuating piston and cylinder assembly for opening the valve. A balance line extending to the second side of the piston and cylinder assembly for compensating for the hydrostatic pressure in the control line. The piston and cylinder assembly includes a check valve providing communication of hydraulic fluid from the balance line to the control line for purging the balance line of gas. A second piston and cylinder assembly is positioned adjacent to and actuated by the first piston cylinder assembly. The cross-sectional area of the piston of the first assembly is greater than the cross-sectional area of the piston of the second assembly whereby a lower surface operating pressure in the control line on the larger first assembly will open the valve. The closing force acts through the smaller second assembly to close the valve.

REFERENCES:
patent: 3854502 (1974-12-01), Mott
patent: 4062406 (1977-12-01), Akkerman et al.
patent: 4069871 (1978-01-01), Page, Jr.
patent: 4149698 (1979-04-01), Deaton
patent: 4161219 (1979-07-01), Pringle
patent: 4407363 (1983-10-01), Akkerman
patent: 4522370 (1985-06-01), Noack et al.
"Wellguard II, Surface-Controlled Subsurface Safety Valve System", published by Hydril.

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