E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/3
E21B 34/10 (2006.01) E21B 49/00 (2006.01) E21B 49/08 (2006.01) E21B 34/00 (2006.01)
Patent
CA 1270752
85.030Al Abstract Of The Disclosure An annulus pressure responsive downhole tool includes a housing with an operating element disposed in the housing. The operating element is movable from a first element posi- tion to a second element position relative to the housing. A hydrostatic well annulus pressure referenced annulus pressure responsive first power piston is disposed in the housing and movable from a first to a second position thereof relative to the housing in response to an increase in well annulus pressure. A lower than hydrostatic well annulus pressure referenced annulus pressure responsive second power piston is disposed in the housing and is opera- tively associated with the operating element for permitting the operating element to move from its first element posi- tion to its second element position in response to movement of the second power piston from a first position to a second position thereof relative to the housing. A prevention device is operatively associated with the first and second power pistons for preventing the second power piston from moving to its second position until the first power piston has moved at least part way towards its second position.
527528
Mcmahan Michael E.
Newman Daniel A.
Winslow Donald W.
Zunkel Gary D.
Haliburton Company
Swabey Ogilvy Renault
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