Hydraulically locking stabilizer

Details Hydraulically locking stabilizer Hydraulically locking stabilizer

2009-07-01

2011-12-27

Thompson, Kenneth L (Department: 3676)

Wells

Guide for device or conduit

C175S325100, C166S320000

Reexamination Certificate

active

08082987

ABSTRACT:
A downhole tool includes a pressure housing deployed in the bore of a drill collar. At least three fins are deployed on the housing and in the tool annulus. At least one of the fins includes a floating blade deployed thereon. The blade includes a plurality of radial pistons deployed therein. The pistons are configured such that the surface area of the radially outward facing piston surfaces is greater than the surface area of the radially inward facing piston surfaces. This piston configuration causes the surface area of the radially outward facing blade surface to be less than the radially inward facing blade surface. In operation, hydrostatic pressure exerts a differential force on the pistons and the floating blade thereby urging the pistons radially inward towards the housing and the blade radially outward towards the drill collar.

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