Dual hydraulic safety valve

Details Dual hydraulic safety valve Dual hydraulic safety valve

1988-09-09

1989-06-13

Novosad, Stephen J.

Wells

Processes

Operating valve, closure, or changeable restrictor in a well

166319, 166332, E21B 3410, E21B 4312

Patent

active

048383554

ABSTRACT:
A subsurface well safety valve having two control lines which run from the well surface to first and second piston and cylinder assemblies for controlling the valve. The first of the assemblies is connected to a flow tube for operating the valve but the second assembly is disconnected from the flow tube. When a failure occurs in the primary control system, the first assembly is disconnected from the flow tube and the second piston and cylinder assembly is connected to the flow tube to operate the safety valve.

REFERENCES:
patent: 2798561 (1957-07-01), True
patent: 3799258 (1974-03-01), Tausch
patent: 4161219 (1979-07-01), Pringle
patent: 4187876 (1980-02-01), Lang
patent: 4624315 (1986-11-01), Dickson et al.

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