Cutting structures, tools for use in subterranean boreholes including cutting structures and related methods

A reamer for use in a subterranean borehole comprising:

• at least one blade positioned on the reamer, the at least one blade comprising:
• a plurality of primary cutting elements coupled to the at least one blade and extending along the at least one blade in direction substantially parallel to a centerline of the at least one blade;
• and
• at least one non-cutting rubbing surface coupled to the at least one blade proximate a leading surface of the at least one blade and rotationally leading the plurality of primary cutting elements, wherein an exposure of each of the plurality of primary cutting elements is greater than an exposure of the at least one non-cutting rubbing surface, and wherein a portion of the non-cutting rubbing surface is positioned substantially flush with at least one of a radially outermost surface of the at least one blade or a leading surface of the at least one blade.

A method for enlarging a subterranean borehole, the method comprising:

• engaging a subterranean borehole with at least one reamer blade coupled to a reamer;
• reaming a portion of the subterranean borehole with a plurality of primary cutting structures positioned proximate a centerline of the at least one reamer blade;
• and
• at least partially protecting a leading surface of the at least one reamer blade from wearing against the subterranean borehole with at least one secondary element positioned proximate the leading surface of the at least one reamer blade.