Polycrystalline diamond insert, drill bit including same,...

Details Polycrystalline diamond insert, drill bit including same,... Polycrystalline diamond insert, drill bit including same,...

2011-01-25

2011-01-25

Thompson, Kenneth (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

C175S434000

Reexamination Certificate

active

07874383

ABSTRACT:
Polycrystalline diamond inserts are disclosed. For example, a polycrystalline diamond insert may comprise a polycrystalline diamond layer affixed to a substrate at an interface. In addition the polycrystalline diamond layer may comprise: an arcuate exterior surface, a first region including a catalyst and a second region from which the catalyst is at least partially removed. Further, the arcuate exterior surface may be defined by a portion of the first region including the catalyst and a portion of the second region from which the catalyst is at least partially removed. In another embodiment, the polycrystalline diamond layer may include a convex exterior surface for contacting a subterranean formation, wherein at least a portion of a catalyst used for forming the polycrystalline diamond layer is removed from a region of the polycrystalline diamond layer. Subterranean drilling tools (e.g., percussive drill bits) including at least one polycrystalline diamond insert are disclosed.

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