Cutting elements for casing component drill out and...

Boring or penetrating the earth – Bit or bit element – Specific or diverse material

Reexamination Certificate

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Reexamination Certificate

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07836978

ABSTRACT:
A drill bit or milling tool includes a bit body on which a plurality of cutting elements are disposed. At least some of the plurality of cutting elements include a diamond table and a superabrasive material non-reactive with iron-based materials disposed over at least a portion of an exterior surface of the diamond table. The diamond table is suitable for drilling through a subterranean formation and the non-reactive superabrasive material is suitable for drilling through a casing or casing-associated component comprising an iron-based material and disposed within the subterranean formation. The diamond table may comprise a PDC and the non-reactive superabrasive material may comprise cubic boron nitride.

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U.S. Appl. No. 11/928,956, filed Oct. 30, 2007, entitled “Earth Boring Drill Bits with Casing Component Drill Out Capability and Methods of Use,” by Eric. E. McClain et al.
PCT International Search Report mailed Feb. 2, 2009 for International Application No. PCT/US2008/066300.

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