Apparatus for early evaluation formation testing

Details Apparatus for early evaluation formation testing Apparatus for early evaluation formation testing

1997-04-01

1999-04-06

Neuder, William

Wells

Processes

Operating valve, closure, or changeable restrictor in a well

166321, E21B 3400

Patent

active

058905421

ABSTRACT:
A downhole tool (34) comprising a housing (60), a mandrel (76) slidably disposed within the housing (60), the mandrel (76) having a fluid passageway (52) extending axially therethrough, a valve (50) disposed within the mandrel (76), the valve (50) having first and second positions to selectively permit and prevent fluid flow through the fluid passageway (52) of the mandrel (76) and first and second pistons (98, 104) slidably disposed between the housing (60) and the mandrel (76), the first and second pistons (98, 104) slidably displacable in opposite directions relative to the housing (60) in response to a differential fluid pressure, the first and second pistons (98, 104) selectively engagable with the mandrel (76) to respectively displace the mandrel (76) in first and second directions, thereby operating the valve (50) between said first and second positions.

REFERENCES:
patent: 4633952 (1987-01-01), Ringgenberg
patent: 4667743 (1987-05-01), Ringgenberg et al.
patent: 4817723 (1989-04-01), Ringgenberg
patent: 4979568 (1990-12-01), Spencer, III et al.
patent: 5482119 (1996-01-01), Manke et al.
patent: 5518073 (1996-05-01), Manke et al.

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