Abstract: Systems and methods usable for drilling wells and performing other well operations include a drilling tool having inner and outer, counter-rotating drill bits. Opposing reactive torques generated by the inner bit and the outer bit can reduce or cancel the net reactive torque transmitted upwell, through the drill string. Counter rotation of the inner and the outer drill bits can be achieved by a gear system, which transfers torque from a single rotating tubular shaft to a tubular sleeve positioned concentrically about the tubular shaft. The gear system transfers torque from a first gear to a second gear, at a one-to-one rotation/torque ratio, but with an opposite direction of rotation. Tools connected to the tubular sleeve and tubular shaft can thereby be provided with opposing rotational motion.

Abstract: A device for boring a well. The device is attached to a motor that has a power shaft for imparting rotational movement. The device includes a driver operatively connected to the power shaft, with the driver containing a cylindrical body, a first bit having a first end connected to the driver so that rotational movement of the driver is imparted to the first bit, and a sleeve disposed about the power shaft. The device further includes a housing disposed about the driver, and a second bit attached to the housing. Through engagement of cogs and pinions, rotation of the first bit in a first direction using the driver causes counter rotation of the second bit in an opposite direction, significantly reducing or eliminating reactive torque produced during drilling.

Abstract: An apparatus for steering a drill string is disclosed herein, the apparatus comprising a drilling motor comprising a rotor, a stator, and at least one fluid passage for flowing drilling fluid to the stator. A blade is fixedly disposed on the exterior surface of the stator. A diverter valve controls the flow rate of drilling fluid to the stator, to provide counter rotational movement to the stator with respect to the rotor. Placement and movement of the blade is thereby controlled. When the blade is rotated such that it remains stationary with respect to a fixed point in a borehole, the drill bit is turned. When the blade is counter-rotated in a constant motion with respect to the rotor, the drill bit continues to drill in a straight direction.