Safety valve manifold system

Details Safety valve manifold system Safety valve manifold system

1982-02-26

1983-09-20

Pate, III, William F.

Wells

With below and above ground modification

Above ground actuating means for below ground device

166 95, 166 97, 251 57, E21B 712

Patent

active

044050143

ABSTRACT:
A hydraulic safety valve manifold system for providing positive opening and closing of a surface-controlled, sub-surface safety valve in a subsea well, including a shut-off valve which prevents leakage of well fluids to the outside environment if a leak should occur in the safety valve or in hydraulic lines which are connected to the hydraulic actuator of the safety valve. A hydraulic control line is connected to the safety valve actuator through a normally closed shut-off valve, and this line is also connected to the actuator of the shut-off valve to hold both the shut-off valve and the safety valve open when the line is pressurized. The hydraulic line is also connected to an actuator of a variable volume accumulator to empty the accumulator when the line is pressurized. When pressure in the hydraulic line is relieved the shut-off valve closes and the accumulator accepts fluid from the hydraulic actuator of the safety valve to insure that the safety valve closes.

REFERENCES:
patent: 2998070 (1961-08-01), Tamplen
patent: 3142337 (1964-07-01), Poorman
patent: 3467129 (1969-09-01), Gratzmuller
patent: 3763891 (1973-10-01), Stiltner
patent: 3850237 (1974-11-01), Ahlstone
patent: 3854695 (1974-12-01), Baugh
patent: 4082147 (1978-04-01), Wolff
patent: 4193449 (1980-03-01), Lochte
patent: 4258786 (1981-03-01), Lochte

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