Patent ID: 7621351
Filing Date: 2009-11-24
Classification: E21B

Abstract:
1. A reaming tool, comprising: a substantially tubular body having a concave nose portion extending to a side wall through a substantially arcuate shoulder transition region; a plurality of circumferentially spaced, spirally configured blades on an exterior of the body extending from proximate the shoulder transition region and defining junk slots therebetween, an axially leading end of each blade commencing with substantially no standoff and tapering radially outwardly to a portion having a substantially constant standoff and having a radially inwardly extending, beveled, axially trailing end; and cutting structure configured and positioned on the side wall of the substantially tubular body for contact with a bore hole side wall, the cutting structure comprising a plurality of cutting elements disposed along a rotationally leading edge of each blade of the plurality proximate an axially leading end thereof.