Pressure operated test valve

Details Pressure operated test valve Pressure operated test valve

E - Fixed Constructions

21

B

166/2

E21B 34/10 (2006.01) E21B 49/00 (2006.01) E21B 34/00 (2006.01)

Patent

CA 1248441

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.

500280

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