Patent ID: 6123160
Filing Date: 2000-09-26
Classification: E21B

Abstract:
A rotary drill bit for drilling wellbore in a subterranean formation, comprising:a bit body having a leading end with a face and a trailing end;a cutting structure mounted on said face and including a plurality of face cutters mounted on said face; andat least one gage definition region longitudinally extending from proximate said plurality of face cutters toward said trailing end, said at least one gage definition region defining a larger diameter at its trailing longitudinal extent than at its leading longitudinal extent and including a plurality of cutters disposed thereon to form at least one variable-pitch helix arranged to substantially match a range of predicted helical paths of cutters of said at least one gage definition region into a formation attributable to rotation and longitudinal advance of said drill bit in drilling of said wellbore.