Drill bit apparatus to control torque on bit

摘要

A drill bit 10 for drilling a wellbore in a subterranean formation, the drill bit comprising: a plurality of cutters 50, 60 disposed at a contact face of the drill bit, each of the cutters having a cutting face arranged to cut into the formation when the drill bit is rotated about an axis of rotation passing through the contact face during drilling of the wellbore. At least one of the cutters located inside a gauge portion of the drill bit is machined form a substantially flat surface 62 which intersects with the cutting face of the cutter and defines a cutting edge of the cutting face of the cutter. At least one cutter may be located in a central regain of the contact face adjacent to where the axis passes through. Related methods for designing and manufacturing a drill bit are also disclosed.