Orientation control mechanism

Details Orientation control mechanism Orientation control mechanism

1995-02-24

1996-08-20

Dang, Hoang C.

Boring or penetrating the earth

Processes

Boring curved or redirected bores

175 73, E21B 706

Patent

active

055470319

ABSTRACT:
In a curve drilling assembly having a mandrel rotatably mounted within a cylindrical sleeve, an apparatus and method of using the apparatus are disclosed for orienting the sleeve of a curve drilling system and for shifting modes of operation of a curve drilling system from a steering mode to a straight drilling mode. The apparatus comprises: a drilling fluid powered blade that is carried by the sleeve for engaging the walls of a curved borehole and inducing counter-clockwise rotation of the sleeve; and a valve, carried within the mandrel, for operating the blade by introducing pressurized drilling fluid from the interior of a drill string connected to the mandrel.

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