Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Reexamination Certificate
2005-04-12
2005-04-12
Bagnell, David (Department: 3672)
Wells
Processes
Operating valve, closure, or changeable restrictor in a well
C166S188000, C166S177100, C166S177700, C166S319000
Reexamination Certificate
active
06877566
ABSTRACT:
A method and apparatus for causing pressure variations in a wellbore. A valve mechanism and a sealing device are provided in the wellbore. The valve mechanism is part of a valve device which may be actuated between an open position and a closed position. The valve device is actuated to the closed position to allow an increase in pressure below the sealing device and is actuated to the open position to allow a fluid to pass through the valve device up the wellbore. The valve device is alternately actuated between the closed position and the open position to cause cyclical pressure variations in the wellbore below the sealing device. The valve device includes the valve mechanism, a fluid passage, a control mechanism for controlling the valve mechanism, and a delay mechanism for delaying the actuation of the valve device from the open position to the closed position. The increase in pressure in the wellbore below the sealing device is caused by either or both of a fluid entering the wellbore from an adjacent formation or by the introduction of a pressurized fluid into the wellbore below the sealing device.
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PCT International Search Report for PCT/CA 03/01086 dated Nov. 11, 2003.
Anderson Clifford J.
Schoettler Michael F.
Selinger Richard
Thicke Brian R.
Bagnell David
Kuharchuk Terrence N.
Rodman & Rodman
Selinger Richard
Smith Matthew J
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