Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Patent
1995-06-05
1997-03-04
Dang, Hoang C.
Boring or penetrating the earth
Bit or bit element
Specific or diverse material
E21B 1046
Patent
active
056070250
ABSTRACT:
A fixed cutter drill bit includes cutter elements mounted in sets on the bit face. A cutter element set includes at least three cutters with cutting faces having at least two different curvatures. The cutter elements of the set are mounted on various blades of the bit such that, in rotated profile, the cutting profile of a larger and a smaller cutter element overlap, and such that the smaller cutter element is flanked by larger sized cutters. The bit exhibits increased stability, before and after wear has occurred. The large cutters provide for efficient shearing while the smaller cutters may provide prefracturing in certain formations.
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Keith Carl W.
Mensa-Wilmot Graham
Dang Hoang C.
Maag Gregory L.
Smith International Inc.
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