Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1993-06-15
1994-10-04
Bagnell, David J.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175426, 175431, E21B 1016
Patent
active
053517709
ABSTRACT:
A rotary cone rock bit for drilling boreholes in an earthen formation is disclosed. One or more rotary cones are rotatively retained on a journal bearing connected to the rock bit. These rotary cones form a circumferential heel row with extended ultra hard shaped cutters spaced within the heel row. Each of the shaped cutters form a cutting surface that extends above the heel row or is angled with respect to the formation to maintain the cutters in compression while the cutters shear a borehole wall. The shaped cutters serve to maintain the borehole diameter.
REFERENCES:
patent: 4148368 (1979-04-01), Evans
patent: 4203496 (1980-05-01), Baker, III et al.
patent: 4940099 (1990-07-01), Deane et al.
patent: 5131480 (1992-07-01), Lockstedt et al.
patent: 5145016 (1992-09-01), Estes
patent: 5154245 (1992-10-01), Waldenstrom et al.
patent: 5199832 (1993-04-01), Meskin et al.
Cawthorne Chris E.
McDonough Scott D.
Portwood Gary
Siracki Michael A.
Bagnell David J.
Smith International Inc.
Upton Robert G.
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