Patent ID: 8973685
Filing Date: 2015-03-10
Classification: E21B

Abstract:
1. A high speed reaming tool for cleaning out and opening an existing borehole, comprising: a tubular body; a plurality of blades extending from the body with cutting elements on a leading edge defining a profile and extending to an upper end thereof; the profile extending from a cylindrical gage section through a shoulder section to a nose and into a central concave cone defined by a straight taper and disposed about the axis of said body; said profile having a length (PL); said body having a size (BS) defined by a diameter in a plane that is transverse to said axis and intersects said gage section, wherein the ratio of PL/BS is less than 75; a plurality of gage pads extending from said upper ends of said blades, said gage pads recessed radially from said upper ends of said blades at a transition and further comprising wear resistant inserts extending from adjacent said transition, said cutting elements closest to said gage pads extending radially away from said axis more than an outer face of said wear resistant inserts.