Wells – Valves – closures or changeable restrictors – Fluid operated
Patent
1981-10-22
1983-08-23
Novosad, Stephen J.
Wells
Valves, closures or changeable restrictors
Fluid operated
166319, 166373, 166386, E21B 3414
Patent
active
043998704
ABSTRACT:
A valve used in a drill stem test tool has a ball movable between an open position to allow flow through the drill string for testing and a closed position to block flow. Operating means move the ball between the open and closed positions in response to pressures in the well annulus. A nitrogen filled pressure chamber and pressure balancing piston compensate for variations in annular pressure as the tool is being lowered into position in the well. Actuating means including a weight operated sleeve are operated from the surface to overcome the compensating effect of the pressure balancing piston to allow the ball to be rotated to the open position. The ball is spring biased toward the closed position by a coil spring located inside the pressure chamber. Relieving pressure in the annulus causes the spring to close the ball.
REFERENCES:
patent: Re25471 (1963-11-01), Fredd
patent: 3200837 (1965-08-01), Brown
patent: 3750751 (1973-08-01), Mott
patent: 3830297 (1974-08-01), Cockrell
patent: 3856085 (1974-12-01), Holden et al.
patent: 4071088 (1978-01-01), Mott
patent: 4144937 (1979-03-01), Jackson et al.
patent: 4340088 (1982-07-01), Geison
Baugh John L.
Manderscheid Phillip H.
Montgomery James W.
Bui Thuy M.
Felsman Robert A.
Gunter Jr. Charles D.
Hughes Tool Company
Novosad Stephen J.
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