Drilling tool with non-rotating sleeve

Boring or penetrating the earth – Automatic control – Of advance or applied tool weight

Reexamination Certificate

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Details

C175S061000, C175S076000

Reexamination Certificate

active

06840336

ABSTRACT:
The invention refers to a drilling tool and method that, among other aspects, provides for a sleeve with expansible pads for positioning the drilling tool in the desired direction during drilling. The pads are hydraulically expanded and retracted by a valve system which selectively diverts mud flowing through the tool to the desired pads. The tool may also be provided with a flexible tube connecting the sleeve to drilling tool for maneuvering along deviations or curves in the wellbore.

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Comeaux B.C., “Implementation of a Next Generation Rotary Steerable System,”AADE 01-NC-HO-25 National Drilling Conference, pp. 1-7, Houston TX (Mar. 27-29, 2001).
Gruenhagen H., Hahne U. & Alvord G., “Application of New Generation Rotary Steerable System for Reservoir Drilling in Remote Areas,”IADC/SPE 74457 Drilling Conference, pp. 1-7, Dallas TX (Feb. 26-28, 2002).
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