High-shear roller cone and PDC hybrid bit

摘要

A drill bit having a bit body, at least one blade extending radially from the bit body, a plurality of blade cutting elements disposed on each blade, at least one journal extending downwardly and radially outward from a longitudinal axis of the drill bit, a roller cone or roller disc mounted rotatably to each journal, and a plurality of cutting elements disposed on each roller cone or roller disc, and methods for making the drill bit are disclosed.

主权项

1. A drill bit, comprising:
a bit body; at least one blade extending radially from the bit body; a plurality of blade cutting elements disposed on the at least one blade and forming a blade cutting profile extending through at least nose, shoulder, and gage regions; at least one journal extending directly from the bit body and downwardly and radially outward from a longitudinal axis of the drill bit, wherein the at least one journal has a journal axis; a rolling cutter mounted rotatably to each of the at least one journal, wherein the rolling cutter is a roller cone or a roller disk; and a plurality of cutting elements disposed on each rolling cutter and forming a rolling cutter cutting profile, wherein the rolling cone cutting profile overlaps with the blade cutting profile at least in the shoulder and nose regions of the blade cutting profile.