Wells – Valves – closures or changeable restrictors – Fluid operated
Patent
1989-04-14
1990-09-18
Novosad, Stephen J.
Wells
Valves, closures or changeable restrictors
Fluid operated
166324, 251117, E21B 3408
Patent
active
049571672
ABSTRACT:
A retrievable fluid control valve apparatus is provided for controlling fluid flow into a tubing string of a well. The control valve apparatus includes a housing. The housing includes a seal for sealingly engaging a landing nipple of the tubing string. A flow passage is defined through the housing and has an open end defined in the housing below the seal. A flow port is defined through the housing and communicates the flow passage with an exterior of the housing above the seal. A flow valve is disposed in the housing and is movable between a closed position wherein the flow passage is closed and an open position wherein the flow passage is open. A spring is associated with the flow valve for biasing the flow valve toward its closed position. A differential area piston is associated with the flow valve for overcoming the force of the spring and moving the flow valve to its open position when a fluid pressure in the tubing string exterior of the housing exceeds a predetermined value. A dampening sub is included in the control valve apparatus for damping closing movement of the valve from its open position to its closed position. The damping sub extremely overdamps the system thus eliminating hydrodynamically induced flutter of the spring biased valve, and also providing for a soft closing motion of the valve.
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Halliburton Co.
Melius Terry Lee
Novosad Stephen J.
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