Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1990-11-14
1992-03-17
Dang, Hoang C.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175339, 175424, E21B 1018
Patent
active
050960059
ABSTRACT:
A rotary drill bit (10) has fluid discharge nozzles (36A, 36B, 36C) positioned between adjacent pairs of roller cutters (20A, 20B, 20C). A fluid discharge nozzle (36A) provides a stream of drilling fluid (44) directed toward an adjacent roller cutter (20A) and slanted toward the bore hole side wall away from a radial direction at a slant impact angle B for first impacting the side wall (34), and then sweeping in a high velocity stream along the corner surface (33) and inwardly across the bore hole bottom (32) at cutting element engagement locations (39).
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Ivie Craig R.
Pearce David E.
Camco International Inc.
Dang Hoang C.
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