US Patent 7810584 Method of directional drilling with steerable drilling motor

Drilling a bore hole comprises rotary drilling at a first rotation rate until a first target value is substantially met, changing the first rotation rate to a second rotation rate when a trigger is substantially met, and then drilling at the second rotation rate until a second target value is substantially met. Preferably, the second rotation rate is substantially zero, so the drilling at the second rotation rate is slide drilling. Finally, the steps of rotary drilling at a first rotation rate, changing the rotation rate to a second rotation rate, and drilling at the second rotation rate are repeated.