E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/2
E21B 47/00 (2006.01) E21B 34/10 (2006.01) E21B 49/00 (2006.01) E21B 34/00 (2006.01)
Patent
CA 1236769
Abstract Of The Disclosure A downhole tool apparatus has a housing with a compression chamber defined therein. A fill passage is disposed through the housing for placing the compression chamber in open flow fluid communication with a well annulus exterior of the housing so that well fluid may flow into the compression chamber as the apparatus is lowered into a well. An isolation valve is provided for selectively closing the fill passage and thereby trapping well fluid in the compression chamber. An operating element is disposed in the housing. An actuating piston is slidably disposed in the housing and is operably associated with the operating element for operating the same in response to movement of the actuating piston relative to the housing. The actuating piston and housing are so arranged and constructed that movement of the actuating piston relative to the housing changes the volume of the compression chamber and of any well fluid trapped therein. The volume of the compression chamber is sufficiently large that an equal volume of water containing no absorbed gases would have a volume decrease when subjected to a pressure increase equivalent to a prede- termined operating pressure of the actuating piston means, at least as great as the decrease in volume of the compression chamber when the actuating piston is moved bet- ween first and second positions thereof relative to the housing.
493672
Company Halliburton
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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