Patent ID: 8408336

Claim:
A downhole drill string assembly comprising: a cylindrical body having a longitudinal bore adapted to receive a drilling fluid; a fluid within said longitudinal bore; a turbine disposed within said longitudinal bore and in fluid communication with said longitudinal bore, said turbine having at least one fixed blade adapted to rotate said turbine in response to a flow of said drilling fluid; at least one flow guide disposed within said longitudinal bore upstream of said turbine and in fluid communication with said longitudinal bore, said at least one flow guide having at least one adjustable vane having an orientation, said orientation adapted to alter said flow of said drilling fluid proximate said turbine; an actuator in mechanical communication with said at least one flow guide, said actuator adapted to selectively alter said orientation of said at least one adjustable vane; and a jack element disposed within the downhole drill string assembly, the jack element having an actuation coupled to the rotation of the turbine.