Ultra hard insert cutters for heel row rotary cone rock bit applications
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United States of America Patent
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-
Aug 30, 1994
Grant Date -
N/A
app pub date -
Jan 8, 1993
filing date -
Jan 8, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
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 cutting edges that shear a borehole wall formed by the formation as the rotary cone rotates against a bottom of the borehole formed by the formation. The shaped cutters serve to maintain the borehole diameter and to divert formation debris away from bearing surfaces formed between the rotary cone and the journal bearing.
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