Wells – Valves – closures or changeable restrictors – Fluid operated
Patent
1991-03-15
1992-04-07
Novosad, Stephen J.
Wells
Valves, closures or changeable restrictors
Fluid operated
166264, 166332, 166374, E21B 3410
Patent
active
051019043
ABSTRACT:
An actuator for actuating a downhole mechanism in a well utilizes increased annular pressure in one instance, and a control line pressure in a second instance. The actuator has an actuating chamber in which an actuating piston moves. The actuating piston communicates with the annulus pressure on one side and with pressure in an intensified pressure chamber on the other side. A control valve locates in a control passage leading from the intensified pressure chamber to the actuator piston. A vent valve locates in a vent passage that leads from the actuator piston to the annulus. The vent valve will close when pressure in the intensified pressure chamber exceeds the annulus pressure by a selected amount. Then, at a selected higher pressure, the control valve will open, allowing the pressure in the intensified pressure chamber to act on the actuator piston. A differential area piston will supply the increased pressure in the intensified pressure chamber from the annulus when the actuator is used with a test tool. When used with the safety valve, a control line may lead from the surface to the intensified pressure chamber if an unlimited number of cycles are required.
REFERENCES:
patent: 4044829 (1977-08-01), Jessup
patent: 4422506 (1983-12-01), Beck
Bradley James E.
Novosad Stephen J.
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