Patent ID: 7147066

Claim:
A bottom hole assembly for drilling a deviated borehole, the bottom hole assembly comprising: one of a positive displacement motor and a rotary steerable device having a housing, the housing having an upper central axis; a rotary shaft having a portion with a lower central axis, the portion being offset with respect to the housing so as to result in an intersection of the upper central axis and the lower central axis; the housing containing at least a portion of the rotary shaft; a bit powered by the rotary shaft, the bit having a bit face defining a bit full cutting diameter; and a gauge section spaced above the bit face, a top of the gauge section having a diameter which is substantially the bit full cutting diameter; wherein an axial spacing between the bit full cutting diameter and the top of the gauge section is at least 75% of the bit full cutting diameter; and wherein an axial spacing along the lower central axis between the intersection and the bit face is less than twelve times the bit full cutting diameter.