Rotary drills bits
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United States of America Patent
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-
Nov 24, 1992
Grant Date -
N/A
app pub date -
Nov 21, 1990
filing date -
Nov 25, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A rotary drill bit comprises a bit body having a shank for connection to a drill string and a passage for supplying drilling fluid to the face of the bit, which carries a plurality of polycrystalline diamond preform cutting elements. The cutting elements are mounted on a single radially extending blade so that the bit is imbalanced and a resultant sideways force is applied to the bit as it rotates during drilling. The gauge of the bit body is provided with a low friction bearing pad which extends rearwardly of the blade and transmits the resultant sideways force to the sides of the bore hole. Since the bearing pad is low friction, it slides around the surface of the formation and any tendency for bit whirl to be initiated is reduced.
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