Page 594 - Air and Gas Drilling Manual

11-32 Air and Gas Drilling Manual
Depending on the drilling applications, a motor size and lobe configuration may be
more effective than another.

Figure 11-10: Cutaway view of a typical 5:6 lobe configuration positive displacement
mud motor (courtesy of Baker Oil Tools).
Downhole positive displacement motors have been very useful in directional
drilling operations. For directional drilling operations, the downhole positive
displacement motor is made up to a bent sub directly above the motor with an