E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/5
E21B 23/08 (2006.01) E21B 23/00 (2006.01) E21B 34/10 (2006.01) E21B 49/00 (2006.01) E21B 34/00 (2006.01)
Patent
CA 1211036
Abstract of the Disclosure 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 pis- ton. A retarding device is disposed in the second pressure conducting passage for delaying communication of a suffi- cient 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.
460969
Company Halliburton
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
LandOfFree
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