E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/5
E21B 49/02 (2006.01) E21B 34/10 (2006.01) E21B 49/00 (2006.01) E21B 34/00 (2006.01)
Patent
CA 1211035
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. The retarding device is an annular floating shoe having a large number of O-rings frictionally engaging inner and outer tubular members of said 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 suffi- cient to permit the power piston to travel to its second position. A spring biased pin disposed in the housing engages an indentation in an actuating mandrel attached to said power piston to releasably hold the power piston in its second position.
460968
Company Halliburton
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
LandOfFree
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