Patent ID: 6167975
Filing Date: 2001-01-02
Classification: E21B

Abstract:
A one cone drill bit comprising: (a) a drill bit body having a threaded upper end for connection in a drill string; (b) said drill bit body extending below the threaded upper end and having a passage therein for mud flow; (c) at least one mud flow jet installed in said drill bit body and having an opening therein wherein the jet is positioned to direct a downwardly directed flow of drilling mud utilizing drilling mud which is pumped into a drill string connected to the drill bit and wherein the flow of drilling mud is confined against the face of the well borehole being drilled; (d) a downwardly deployed portion on said body; (e) a journal extending at an angle from said portion; (f) a single cone mounted for rotation on said journal wherein said cone has a large upper end at the upper end of said journal and a smaller lower end with a central lower end nose area; (g) a cone surface supporting one or more rows of cutting teeth bearing against the face of the well borehole for extending the well borehole during drilling; (h) a groove formed on said cone nose area wherein said groove while rotating receives the jet of drilling mud from said jet and said groove cooperates to direct mud flow from the jet; and (i) wherein said groove defines a substantially clear pathway from the jet so that the drilling mud is directed across the face.