Low pressure responsive downhole tool with differential pressure

Details Low pressure responsive downhole tool with differential pressure Low pressure responsive downhole tool with differential pressure

1983-09-19

1984-12-25

Novosad, Stephen J.

Wells

Processes

Operating valve, closure, or changeable restrictor in a well

166321, 166332, E21B 3410

Patent

active

044897863

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. A back pressure check valve is also disposed in the second pressure conducting passage to provide a continuing but releasable pressure differential across the power piston to releasably hold the power piston in its second position.

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"APR Ball Valve Tester", Halliburton Services, Sales and Service Catalog-No. 39, pp. 3310-3311.

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