Patent ID: 7188685

Claim:
A bottom hole assembly rotatably adapted for drilling directional boreholes into an earthen formation comprising an upper stabilizer mounted to a collar, and a rotary steerable system, the rotary steerable system comprising an upper section connected to the collar, a steering section, and a drill bit arranged for drilling the borehole attached to the steering section, the rotary steerable system adapted to transmit a torque from the collar to the drill bit, the steering section joined at a swivel with the upper section, wherein a lower stabilizer is mounted on the upper section, the swivel is actively tilted intermediate the drill bit and the lower stabilizer by a plurality of intermittently activated pistons acting on the steering section relative to the upper section so as to change their angle relative to each other in order to maintain a desired drilling direction as the bottom hole assembly rotates, and wherein no portion of the rotary steerable system exposed to the earthen formation is stationary with respect to the earthen formation while drilling.