Patent ID: 8201642

Claim:
A drilling assembly comprising: a motor having an outer housing and a drive shaft, the outer housing of the motor configured to be coupled to a drill string and to rotate in a first rotational direction about a longitudinal axis of the drill string to be connected to the motor in unison with rotation of the drill string about the longitudinal axis, the motor configured to rotate the drive shaft in a second rotational direction opposite the first rotational direction about the longitudinal axis of the drill string; a drill bit for drilling a wellbore, the drill bit coupled to the drive shaft of the motor and configured for drilling responsive to rotation in the second rotational direction about the longitudinal axis of the drill string; and a reamer apparatus coupled to the outer housing of the motor, the reamer apparatus configured for reaming responsive to rotation in the first rotational direction about the longitudinal axis of the drill string in unison with at least a portion of the drill string to enlarge a diameter of the wellbore drilled by the drill bit, at least a portion of the reamer apparatus extending longitudinally relative to the wellbore radially adjacent at least a distal end portion of the drill bit, a distal end of the drill bit and a distal end of the reamer apparatus being at least substantially located in the same plane, the reamer apparatus extending around an outer diameter of the drill bit and within the outer diameter of the drill bit.