Measurement of curvature of a subsurface borehole, and use...

Geometrical instruments – Gauge – Internal

Reexamination Certificate

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C033S0010HH, C033S543000

Reexamination Certificate

active

06877241

ABSTRACT:
The present invention provides methods of measuring downhole the curvature of a borehole and, in a particular application of the invention, using the curvature information as an input component of a bias signal for controlling operation of a downhole bias unit in a directional drilling assembly.

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