The downhole mud motor is a kind of drilling tools developed for converting  hydraulic energy into mechanical energy through a conjugate if a stator and rotor. The motors are usually divided into two kinds,single lobe (1/2) and multi lobe (N/N+1) motors, according to the quantities of the lobes of the stator and rotor. Generally speaking, for motors of the same length of rotor or stator section, the more are the lobes ,the higher is the output torque, while the lower is the rotate speed, vice versa. The motors are usually used together with cone bits, diamond bits and so on in drilling operation, such as directional ,vertical and horizontal drilling ,correcting deviation, coring, reaming , sidetracking, etc.

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