Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Reexamination Certificate
2005-07-26
2008-08-05
Wright, Giovanna C (Department: 3672)
Wells
Processes
Operating valve, closure, or changeable restrictor in a well
C425S426000, C425S434000, C425S435000
Reexamination Certificate
active
07407012
ABSTRACT:
A roller cone drill bit for drilling earth formations includes a bit body having at least one roller cone rotably attached to the bit body and a plurality of cutting elements disposed on the at least one roller cone in a plurality of rows arranged circumferentially around the at least one roller cone, wherein at least one cutting element in the gage row, the heel row, or a surface of the at least one roller cone bounded by the gage and heel rows comprises thermally stable polycrystalline diamond or a thermally stable polycrystalline diamond composite. The at least one cutting element may be a TSD insert or a TSD composite insert and may be formed by brazing, sintering, or bonding by other technologies known in the art a thermally stable polycrystalline diamond table to a substrate. The interface between the diamond table and the substrate may be non-planar. A roller cone drill bit includes a bit body, at least one roller cone rotably attached to the bit body, and a plurality of cutting elements disposed on the at least one roller cone, where at least one of the plurality of cutting elements comprises thermally stable polycrystalline diamond or a thermally stable polycrystalline diamond composite and a cutting surface, wherein at least a portion of the cutting surface is contoured.
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Griffo Anthony
Keshavan Madapusi K.
Osha & Liang LLP
Smith International Inc.
Wright Giovanna C
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