Wells – Processes – With indicating – testing – measuring or locating
Patent
1984-10-31
1986-05-20
Novosad, Stephen J.
Wells
Processes
With indicating, testing, measuring or locating
166142, 166184, E21B 4700, E21B 3310, E21B 3408
Patent
active
045894850
ABSTRACT:
A downhole tool apparatus includes a housing having an operating element disposed therein. An actuating piston is disposed in the housing and is operably associated with the operating element so that the operating element is operated in response to movement of the actuating piston relative to the housing. A packer is disposed about the housing for sealing between the housing and a well bore and for thereby defining an upper end of a sealed well annulus zone external of the housing. A compression passage is disposed through the housing and communicates a low pressure side of the actuating piston with the sealed well annulus zone exterior of the housing. A lower packer is longitudinally spaced from the upper packer defines a lower end of the sealed well annulus zone. The upper and lower packers are set to define the sealed well annulus zone and to define a trapped reference pressure therein equivalent to the hydrostatic pressure of well annulus fluid. The sealed well annulus zone also provides a trapped volume of well fluid which acts as a compressible fluid spring to oppose the movement of the actuating piston. The actuating piston operates in response to increased well annulus pressure above the upper packer.
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Halliburton Services Sales and Service Catalog No. 41, pp. 4014 and 4015.
Beavers L. Wayne
Bui Thuy M.
Duzan James R.
Halliburton Company
Novosad Stephen J.
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