Push-off pistons

Details Push-off pistons Push-off pistons

E - Fixed Constructions

21

B

166/3

E21B 49/10 (2006.01)

Patent

CA 1256018

Abstract of the Disclosure 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.

507135

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