Patent ID: 8887839

Claim:
A drill bit for drilling subterranean formations comprising: a drill bit body comprising: a group of primary cutting elements on a first blade, the group of primary cutting elements comprising a first primary cutting element and a second primary cutting element radially spaced apart from each other along a first radial axis; and a group of backup cutting elements on the first blade, the group of backup cutting elements comprising a first backup cutting element in a secondary cutting position relative to the first primary cutting element and a second backup cutting element in secondary cutting positions relative to the second primary cutting element, wherein the first backup cutting element and the second backup cutting element are radially spaced apart from each other along a second radial axis different than the first radial axis and comprise a difference in cutting characteristic relative to each other of one of a backrake angle and a siderake angle, and wherein at least one of the first backup cutting element and the second backup cutting element is over-exposed relative to at least one of the first primary cutting element and the second primary cutting element, wherein the exposures of the backup cutting elements of the group of backup cutting elements decrease with increasing distance from a center of the drill bit body along the second radial axis, and wherein one of the backrake angles and siderake angles of the backup cutting elements of the group of backup cutting elements increase with increasing distance from the center of the drill bit body along the second radial axis.