Fluid displacement well safety valve

Wells – Valves – closures or changeable restrictors – Fluid operated

Patent

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Details

251 53, 166 72, E21B 3410

Patent

active

043735878

ABSTRACT:
In a well safety valve for controlling the fluid flow through a well conduit in which the valve has a housing and a flow tube controlling a valve element, the improvement in means for opening and closing the valve. A gas chamber is positioned in the housing with a fluid passageway positioned between the gas chamber and a port for receiving fluid pressure from the well surface for increasing the pressure of the gas in the chamber. One or more pistons are movably positioned in the passageway between the gas chamber and the port with the pistons restricting but allowing fluid flow through the passageway. The pistons are connected to the flow tube whereby when pressure on the port side of the pistons is reduced compressed gas in the gas chamber will act on the fluid in the gas chamber side of the piston to move the pistons in a direction to close the valve. A check valve may be in parallel with the pistons for quickly pressuring the gas chamber. The gas chamber is sealless whereby charged gas will be prevented from escaping. The gas chamber may be an enclosure with a fluid port at the bottom or may include an enclosed bellows. Actuator rods may be connected between the pistons and the flow tube and the rods may be either exposed to tubing pressure in the bore to act to close the valve or may be pressure balanced by being exposed on both ends to tubing pressure in the bore. A spring may be provided to bias the flow tube in a direction to open the valve.

REFERENCES:
patent: 3782461 (1974-01-01), Watkins
patent: 4014386 (1977-03-01), Johnson et al.
patent: 4252197 (1981-02-01), Pringle

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