Downhole resettable formation sampling tool

Details Downhole resettable formation sampling tool Downhole resettable formation sampling tool

1985-10-25

1987-06-30

Levy, Stewart J.

Measuring and testing

Borehole or drilling

Downhole test

166100, E21B 4700

Patent

active

046760962

ABSTRACT:
A tool for use downhole has means (18, 19, 20, 44) for engaging materials surrounding the hole. The engagement means (18, 19, 20, 44) are operated by hydraulic pressure controlled by a hydraulic circuit (10). A hydraulic power module (11) is provided for varying hydraulic pressure in the hydraulic circuit (10) to effect movement of the engagement means (18, 19, 20, 44). In case of failure, a dumping assembly (17) is provided to allow relief of hydraulic pressure in the circuit (10). The dumping assembly (17) includes a dump chamber (62) of variable volume, a dump valve (60) and a non-return valve (61); the hydraulic circuit being capable of being re-set downhole after dumping, there being no need to bring the tool to the surface.

REFERENCES:
patent: 3253654 (1966-05-01), Briggs, Jr. et al.
patent: 3430698 (1969-03-01), Urbanosky
patent: 3577782 (1971-05-01), Aitken
patent: 3952588 (1976-04-01), Whitten
patent: 4210018 (1980-07-01), Brieger
patent: 4246782 (1981-01-01), Hallmark
patent: 4507957 (1985-04-01), Montgomery et al.

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