Patent ID: 9528320
Filing Date: 2016-12-27
CPC Classification: E21B

Claim Text:
1. A rotary steerable drilling system positionable on a rotatable drill string in a wellbore, said rotary steerable system comprising: a gear box driven by a rotatable driveshaft coupled to the rotatable drill string, said gearbox having a rotary input rotatable in a first rotary direction and a rotary output rotatable in second rotary direction opposite to the first rotary direction; the rotatable driveshaft having a first axis of rotation; a pivotable rotatable tubular bit sleeve coupled at a first end to a second end of the rotatable drive-shaft, the bit sleeve pivotable to have a second axis of rotation different than the first axis of rotation of the rotatable driveshaft, said pivotable rotatable tubular bit sleeve including a connector assembly on a distal end of the bit sleeve for coupling the bit sleeve to a drill bit; eccentric cams movably positioned concentrically around the drive-shaft; a differential gearing system connected to the eccentric cams; and pressure applying device connected to the eccentric cams, wherein when activated the pressure applying device applies pressure to modify a speed of rotation of the eccentric cams thereby pivoting the bit sleeve to the second axis of rotation.