Patent ID: 7090034
Filing Date: 2006-08-15
Classification: E21B

Abstract:
1. A reamer for enlarging a bore hole in conjunction with a drill string, the reamer comprising: at least one journal body comprising a tubular body having one journal portion and one toroidal crusher body rotatably attached thereto; means for attaching the at least one journal body to the drill string; the toroidal crusher body, having a maximum diameter, an outer perimeter at the maximum diameter, a crushing surface, and a plurality of crushing buttons on the crushing surface; wherein the toroidal crusher body is rotatably attached to the at least one journal body; wherein the journal portion comprises an enlarged cylindrical surface removably, but irrotatably, mounted on a central portion of an exterior of the tubular body, the enlarged cylindrical surface having a central axis intersecting a longitudinal axis of the tubular body at an acute angle, and the toroidal crusher body having an inner surface rotatably engaging the enlarged cylindrical surface of the tubular body; and when in an installed position, the axis of rotation of the toroidal crusher body intersects the longitudinal axis of the drill string at an acute angle and the outer perimeter encircles the longitudinal axis.