Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Patent
1983-09-19
1985-08-27
Novosad, Stephen J.
Wells
Processes
Operating valve, closure, or changeable restrictor in a well
166331, E21B 3408
Patent
active
045372586
ABSTRACT:
An annulus pressure responsive downhole tool includes a housing having a power piston slidably disposed therein. First and second pressure conducting passages communicate a well annulus with first and second sides of the power piston. A retarding device is disposed in the second pressure conducting passage for delaying communication of a sufficient portion of an increase in well annulus pressure to the second side of the power piston for a sufficient time to allow a pressure differential across the power piston to move the power piston from a first position to a second position relative to the housing. A pressure relief valve is communicated with the second pressure conducting passage between the power piston and the retarding device for relieving from the second pressure conducting passage a volume of fluid sufficient to permit the power piston to travel to its second position.
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Beavers Lucian W.
Bui Thuy M.
Duzan James R.
Halliburton Company
Novosad Stephen J.
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