Boring or penetrating the earth – Processes
Reexamination Certificate
2005-09-23
2009-12-01
Bomar, Shane (Department: 3676)
Boring or penetrating the earth
Processes
C175S431000, C175S426000
Reexamination Certificate
active
07624818
ABSTRACT:
A drill bit includes a bit body having a face on which two different types of cutting elements are disposed, the first type being cutting elements for drilling at least one subterranean formation and the second type being cutting elements for drilling through a casing bit disposed at an end of a casing or liner string and cementing equipment or other components. The second type of cutting elements exhibits a relatively greater exposure than the first type of cutting elements, so as to engage the interior of the casing bit and, if present, cementing equipment components and cement to drill therethrough, after which the second type of cutting elements quickly wears upon engagement with the subterranean formation material exterior to the casing bit, and the first type of cutting elements continues to drill the subterranean formation.
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Greg Galloway Weatherford International, “Rotary Drilling with Casing
McClain Eric E.
Oldham Jack T.
Baker Hughes Incorporated
Bomar Shane
TraskBritt
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