The mud motor is a directional drilling tool usually fixed behind the bit within the drilling string. The bit end rotates when fluid is pumped through the mud motor. It is slightly bent at 0 to 3 degrees, allowing for deviation from the vertical trajectory.
There are two different types of mud motors; fixed and adjustable bent. The angle of the adjustable bent motor can vary to suit the downhole trajectory the drilling engineer wants to achieve, while the fixed one can only drill at a set stage.
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