Patent ID: 8453763

Claim:
An expandable reamer tool comprising: an outer body having a fluid passageway extending therethrough; and at least one blade configured to move relative to the outer body between a retracted position and an expanded position, the at least one blade comprising: a formation-engaging surface comprising a gage area, a longitudinally rearward-most point of the gage area being located a distance from a longitudinal centerline of the formation-engaging surface that is less than about twenty-five percent (25%) of a longitudinal length of the formation-engaging surface; and at least one keyway defined by at least one lateral surface of the at least one blade, the at least one keyway extending a depth into the at least one blade that is greater than about ten percent (10%) of a largest width of the at least one blade, the at least one keyway configured to slideably engage a corresponding protrusion as the at least one blade moves between the retracted position and the expanded position.