Push-off pistons

Details Push-off pistons Push-off pistons

1985-04-22

1986-06-10

Levy, Stewart J.

Measuring and testing

Borehole or drilling

Downhole test

E21B 4900

Patent

active

045935602

ABSTRACT:
In a formation tester having a snorkel extending laterally for penetration of a formation, differential sticking may occur. In the preferred embodiment, the snorkel is surrounded by a seal ring and a resilient pad around the snorkel. The present invention includes upper and lower, evenly spaced push-off pistons. They are extendable parallel to the snorkel to push the tool body away from the wall of the borehole. The pistons extend piston rods supporting end located pads to enable breaking of differential sticking on retraction of the snorkel.

REFERENCES:
patent: B407736 (1975-01-01), Urbanosky
patent: 3577783 (1971-05-01), Whitten et al.
patent: 3724540 (1973-04-01), Urbanosky et al.
patent: 4292842 (1981-10-01), Hallmark
patent: 4375164 (1983-03-01), Dodge et al.
patent: 4434653 (1984-03-01), Montgomery

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