Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1992-04-22
1993-04-13
Novosad, Stephen J.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175426, 175431, E21B 1016
Patent
active
052013766
ABSTRACT:
A roller cutter rock bit includes a cutter constructed with a relief adjacent the cutter heel and gage inserts which each include elongated gage and bottom hole cutting edges which are separated from each other by an obtuse included angle. The edges serve to cut both the bottom of the borehole and the wall when changing the direction of drilling. Both the gage cutting edge and the bottom cutting edge of each gage insert are shaped so as to aggressively cut formation material.
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Smith International Advertisement, "Introducing Smith Tool's New Steerable-Motor Bits", World Oil, May, 1991.
Dresser Industries Inc.
Novosad Stephen J.
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