Patent ID: 6364034
Filing Date: 2002-04-02
Classification: E21B

Abstract:
A drilling motor deviation control apparatus for use as a length element of a fluid conducting drill string for use in wells, the apparatus comprising:a) a down hole drilling motor having a rotor bearingly supported in a body; b) an elongated, generally cylindrical, housing with means for fluid tight attachment to the body of said motor; c) a flexible arbor carried in said housing, with means at a first end for fluid tight attachment to said rotor, and means at the second end for fluid tight attachment to a downwardly continuing drill string element below said housing, said arbor having a rigid length extending from said housing at said second end and having means for hinged attachment to said housing to accept angular change between straight drilling and directional drilling configurations; d) a fluid flow channel in said arbor arranged to receive drilling fluid from said rotor and conduct said fluid to said second end for delivery to said element; e) a selector valve in said housing situated to variably resist said fluid flow in said channel, responsive to signals from the surface, to change between an open state and a closed state; f) a piston in said housing, responsive to said resistance in said channel, arranged to move between first and second positions in response to said changes of state; g) lateral force producing means in said housing, responsive to movement of said piston between said first and said second positions, to move said rigid length between said straight drilling and directional configurations.