Safety valve manifold system

Details Safety valve manifold system Safety valve manifold system

E - Fixed Constructions

21

B

166/41

E21B 43/12 (2006.01) E21B 34/16 (2006.01)

Patent

CA 1156139

ABSTRACT OF THE DISCLOSURE 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 connect- ed 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 pres- surized. 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.

372744

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