Patent ID: 6269892
Filing Date: 2001-08-07
Classification: E21B

Abstract:
A bottom hole assembly for drilling a deviated borehole, the bottom hole assembly comprising:a positive displacement motor driven by pumping downhole fluid through a motor stator to rotate an axially curved motor rotor, the motor having a lower bearing section central axis offset at a selected bend angle from a power section central axis by a bend in the motor housing, and the motor having a substantially uniform diameter motor housing outer surface extending axially from an uppermost end of an upper power section to a lowermost end of a lower bearing section; anda long gauge bit powered by the positive displacement motor, the long gauge bit having a bit face defining a bit diameter and a gauge section having a uniform diameter cylindrical surface spaced above the bit face, the gauge section having an axial length of at least 75% of the bit diameter.