Patent ID: 6131676
Filing Date: 2000-10-17
Classification: E21B

Abstract:
A drill bit for use in drilling a well bore of preselected diameter, said bit comprising:(a) a bit body, said bit body adapted to be rotated about a longitudinal axis of rotation, said bit body further comprisinga bottom, anda plurality of peripheral longitudinal slots, said longitudinal slots located at pre-selected angularly spaced apart locations, said longitudinal slots comprising(i) an upper ledge,(ii) a bottom wall, said bottom wall extending longitudinally to said bottom of said bit body,(iii) a first substantially radially inward sidewall,(iv) a second sloping wedge shaped sidewall;(b) a set of peripheral pedestal mounts, each of said peripheral pedestal mounts comprising (i) a first straight inward sidewall adapted to mate with said first sidewall of said longitudinal slot, (ii) a sloping wedge shaped sidewall adapted to mate with said second sidewall of said longitudinal slot so as to securely wedge said pedestal mount in said bit body, and (iii) a radially inward side, said radially inward side adapted to fit into said longitudinal slots in a close, securely interfitting fashion with said bottom wall of said longitudinal slot;(c) each of said peripheral pedestal mounts further comprising a small diameter single cutting edge rolling disc cutter, said rolling disc cutter affixed to said peripheral pedestal mount at a pre-selected radial location on said bit body, and mounted at a preselected angle delta with respect to said longitudinal axis.