Patent ID: 8770321
Filing Date: 2014-07-08
Classification: E21B

Abstract:
1. A cutting structure for use with an expandable reamer in enlarging a borehole in a subterranean formation, the cutting structure comprising: a plurality of cutter blocks radially extendable from a reamer body away from a central axis of the expandable reamer, each of the plurality of cutter blocks comprising at least one cutter blade thereon; a first cutter blade on each of the plurality of cutter blocks each defining a leading cutter blade with respect to a direction of rotation; and a plurality of cutting elements disposed on the at least one cutter blade, wherein the plurality of cutting elements include cylindrically bodied cutting elements having a working surface geometry of at least one selected from a dome-shaped working surface and a conical working surface, and wherein the plurality of cutter blocks and plurality of cutting elements define a cutting structure that is asymmetric.