Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Patent
1985-01-29
1986-10-28
Novosad, Stephen J.
Wells
Processes
Operating valve, closure, or changeable restrictor in a well
166319, 166386, 166387, E21B 3410, E21B 3708
Patent
active
046193251
ABSTRACT:
A well surging system includes an elongated housing assembly having a central flow bore therethrough. Upper and lower independently operable ball valves are disposed in the housing assembly. Each of the ball valves is movable between a closed position and an open position. When the ball valves are in an initial closed position, a low pressure surge chamber is defined therebetween, which surge chamber is a portion of the flow bore. A packer is connected to the housing assembly for selectively sealing a well annulus between the housing assembly and a well bore so that a well zone below the packer can be surged. The upper and lower ball valves are actuated in response to increases in well annulus pressure through a differential piston arrangement. The lower ball valve is first opened, while the upper ball valve is maintained in a closed position, to allow well fluid from a well zone which is to be surged to surge upward through the flow bore past the opened lower ball valve into the surge chamber. Subsequently, the upper ball valve is opened allowing well fluid in the surge chamber to be circulated upward through a bore of a tubing string connected to the apparatus.
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Duzan James R.
Halliburton Company
Novosad Stephen J.
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