Downhole motor is a kind of downhole dynamic drilling tool upon the
power of drilling mud. Mud stream from the outlet of mud pump flows
through a by-pass valve into the motor. This stream produces
pressure loss at both inlet and outlet of the pump, to push the
rotor into rotating, and to transmit the torque and speed onto the
bit. The downhole motor property mainly depends upon its property
ADVANTAGES OFDOWNHOLE MOTOR
Increased rate of penetration.
Better hole deviation control.
Reduction in drill string failure rate.
Reduction in wear and tear of the swivel, Kelly, and rotary drives.
Reduction in fuel cost, since compared to rotary drilling, less
energy is required to power a downhole motor.