Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1995-08-15
1997-09-02
Neuder, William P.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
761081, E21B 1008
Patent
active
056621833
ABSTRACT:
A PDC drag bit body is disclosed which utilizes a high-strength infiltration binder having a composition comprising a nickel, cobalt, or iron base alloy. The infiltration molding process is modified to account for the higher melting temperatures of these alloys by using graphite plugs in the mold instead of actual PDC inserts, and after the PDC drag bit body has been fabricated and cooled, removing the graphite plugs and brazing the actual PDC inserts in the cavities left by the plugs. Further, the mold is coated with hexagonal-structure boron nitride to prevent the nickel, cobalt, or iron from attacking the graphite molds.
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Neuder William P.
Smith International Inc.
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