Wells – Valves – closures or changeable restrictors – Fluid operated
Patent
1985-03-04
1986-03-25
Novosad, Stephen J.
Wells
Valves, closures or changeable restrictors
Fluid operated
166319, F21B 3410
Patent
active
045776920
ABSTRACT:
A pressure operated test valve for use in a well test string in a well bore is shown. The test string has a packer arranged for sealing the well bore to isolate the annulus between the well bore and the test string above the packer from that portion of the well bore below the packer. The test valve includes a rotating ball valve which is movable between open and closed positions relative to the interior of the test string. A ball piston shifts the rotating ball between the open and closed positions. A coil spring normally urges the ball piston to its valve closing position. A power fluid reservoir contains a power fluid and an axially shiftable power valve is located within a power chamber which communicates with the power fluid reservoir. An axially slidable control valve is located within a control chamber and has a pressure responsive annular area which is exposed to the power fluid for shifting the control valve. The control valve also has internal passages for supplying pressurized power fluid to the power valve to shift the power valve between a first position which isolates the ball piston and a second position which exposes the ball piston to annulus fluid pressure for shifting the ball to the open position. The well hydrostatic pressure is trapped within a control section of the device prior to setting the packer and provides the reference pressure for subsequent shifting of the valve.
REFERENCES:
patent: 3824850 (1974-07-01), Nutter
patent: 3856085 (1974-12-01), Holden et al.
patent: 3964544 (1976-06-01), Farley et al.
patent: 4109724 (1978-08-01), Barrington
patent: 4234043 (1980-11-01), Roberts
patent: 4341266 (1982-07-01), Craig
patent: 4378850 (1983-04-01), Barrington
patent: 4431051 (1984-02-01), Adams, Jr.
patent: 4489786 (1984-12-01), Beck
Felsman Robert A.
Gunter Jr. Charles D.
Hughes Tool Company
Neuder William P.
Novosad Stephen J.
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