Downhole adjustable stabilizer

Details Downhole adjustable stabilizer Downhole adjustable stabilizer

1991-07-30

1993-01-26

Neuder, William P.

Boring or penetrating the earth

Processes

Boring curved or redirected bores

175 73, 175 76, 1753253, E21B 704

Patent

active

051815761

ABSTRACT:
In accordance with illustrative embodiments of this invention, a downhole adjustable stabilizer includes a sleeve having outwardly extending blades and mounted for limited rotation on a mandrel, vertically aligned sets of radially movable buttons mounted in bores in the blades, and longitudinal flats on the outer periphery of the mandrel that when radially aligned with the respective sets of buttons allows them to shift inward to positions where the stabilizer becomes undergage and can be tilted in the borehole. Some spring loaded buttons drag against the borehole wall to provide frictional restraint against rotation of the housing. The blades can each have an inclined side surface that causes the sleeve to be rotated to its position relative to the mandrel where the sets of buttons are retracted as the stabilizer slides downward in the borehole. In another embodiment a hydraulic delay is provided which restrains relative rotation in the direction which cause the buttons to extend to their full gauge diameter.

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