Drill bit with canted gage insert

A rolling cone drill bit has gage inserts 30 on the first row from the bit axis to cut to full gage diameter. The gage inserts have a cutting portion enhanced with a layer (fig 4, 42) of super abrasive material. The gage cutting surface has a center axis 41 which is canted to be more normal to the g...

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Bibliographic Details
Main Authors SCOTT D MCDONOUGH, ALAN W LOCKSTEDT, GARY RAY PORTWOOD
Format Patent
LanguageEnglish
Published 27.01.1999
Edition6
Subjects
EARTH DRILLING
EARTH DRILLING, e.g. DEEP DRILLING
FIXED CONSTRUCTIONS
MINING
OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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Summary:A rolling cone drill bit has gage inserts 30 on the first row from the bit axis to cut to full gage diameter. The gage inserts have a cutting portion enhanced with a layer (fig 4, 42) of super abrasive material. The gage cutting surface has a center axis 41 which is canted to be more normal to the gage curve 22 such that its point of contact at gage is away from the thinner portion of the layer of super abrasive material. The axis 41 of each gage cutter insert 30 is no longer perpendicular to the cone axis 13. The surface of the cone 31 around the insert is reshaped so that it remains perpendicular to the center axis of the insert 41.
Bibliography:Application Number: GB19980014162