Mud motors are bore hole motors which were introduced as a directional drilling technique for oil and natural gas exploration approx 35 years ago. The principle of mud motors is based on screw-type motors driven by drilling fluid. These hydrostatic motors work on the principle of a rotary screw pump.
The hydraulic power generated by the mud motor underground in the form of mud flow and mud pressure is converted into mechanical power. This happens when the drill rods are more or less stationary – reducing borehole friction and the wear of drill rods.
Mud motors are used predominantly in hard ground formations and the application ranges from closely and firmly packed unconsolidated material through the entire bandwidth of solid rock to the hardest rock formations. In accordance with the hardest of rock, different solid rock bore heads are selected that allow effective cutting.