Patent ID: 7814996

Claim:
A drillpipe, comprising: a unitary pipe body having an outer surface, first and second ends connectable to drillstring elements, and an intermediate portion disposed between the first and second ends, the intermediate portion having at least one rib disposed along the outer surface, the rib having a face being substantially perpendicular to the outer surface and being engageable with material adjacent a borehole wall; a first bearing rotatably disposed on the unitary pipe body adjacent the first end and being engageable with the borehole wall, the first bearing haying a first edge restrained by a first shoulder on the unitary pipe body; a first retainer disposed on the unitary pipe body between the first end and the first bearing and restraining a second edge of the first bearing; a second bearing rotatably disposed on the unitary pipe body adjacent the second end and being engageable with the borehole wall, the second bearing having a first edge restrained by a second shoulder on the unitary pipe body; and a second retainer disposed on the unitary pipe body between the second end and the second bearing and restraining a second edge of the second bearing.