Patent ID: 7841426

Claim:
A hybrid drill bit, comprising: a bit body having an axis, an axial center, and at least one fixed blade extending in the axial direction downwardly from the bit body; at least one rolling cutter mounted to the bit body, the rolling cutter being truncated in length such that the distal ends of the rolling cutters are radially spaced apart from the axial center by a minimal radial distance; at least one rolling-cutter cutting element arranged on the rolling cutter and radially spaced apart from the axial center by a minimal radial distance; and a plurality of fixed cutting elements arranged on the fixed blades wherein at least one of the fixed cutting elements is located near an axial center of the bit body and adapted to cut formation at the axial center, wherein the rolling-cutter cutting elements and the fixed cutting elements combine to define a cutting profile that extends from the axial center to a radially outermost perimeter with respect to the axis.