Patent ID: 8752649

Claim:
A well bore reaming device, comprising: a drill string; a bit coupled to the drill string; a bottom hole assembly coupled to the drill string; a bottom eccentric reamer having four sets of cutting elements and coupled to the drill string, wherein each set of cutting elements is arranged on a blade extending from the drill string and, counter to the direction of rotation, the first blade extends a first distance from the drill string, the second blade extends a second distance from the drill string greater than the first distance, and the third and forth blades extend a third distance from the drill string greater than the second distance; and a top eccentric reamer having four sets of cutting elements and coupled to the drill string, wherein each set of cutting elements is arranged on a blade extending from the drill string and, counter to the direction of rotation, the first blade extends a first distance from the drill string, the second blade extends a second distance from the drill string greater than the first distance, and the third and forth blades extend a third distance from the drill string greater than the second distance; wherein the bottom and top eccentric reamers are diametrically opposed on the drill string and do not overlap.