Surface controlled subsurface safety valve

Details Surface controlled subsurface safety valve Surface controlled subsurface safety valve

1981-11-19

1984-02-14

Pate, III, William F.

Wells

With below and above ground modification

Above ground actuating means for below ground device

166324, 166375, 251 28, E21B 3410

Patent

active

044310510

ABSTRACT:
A surface controlled subsurface safety valve for deep well service. Communication of control fluid to the subsurface safety valve is controlled by a pilot valve at a subsurface location in close proximity to the safety valve. Responsiveness of the subsurface safety valve to decrease in control fluid pressure is thereby increased and the safety valve's closure speed is also increased. The pilot valve controllably communicates pressurized control fluid to open the safety valve and allows control fluid to be displaced into the flow path through the safety valve during valve closure.

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patent: 4143850 (1979-03-01), Brakebill
patent: 4173256 (1979-11-01), Kilgore
patent: 4325409 (1982-04-01), Roberts

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