Apparatus for directional drilling

Details Apparatus for directional drilling Apparatus for directional drilling

E - Fixed Constructions

21

B

E21B 7/06 (2006.01)

Patent

CA 2096849

ABSTRACT OF THE DISCLOSURE A downhole steering tool comprises a hollow mandrel, an independently rotatable sleeve extending over a portion of the mandrel, steering plungers carried by the sleeve and extendable and retractable laterally to and from pressure contact with the hole wall for steering a drill below the tool when in use, releasable locking means for locking the sleeve to the mandrel rotationally, and fluid control means operable to direct to the locking means and the steering plungers a portion from fluid circulation through the mandrel to release the locking means and to extend the steering plungers by means of pressure of the fluid.

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