Cutter having shaped working surface with varying edge chamfer

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

Reexamination Certificate

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C175S434000

Reexamination Certificate

active

07726420

ABSTRACT:
A cutter for a drill bit used for drilling wells in a geological formation includes an ultra hard working surface and a chamfer along an edge of the working surface, wherein the chamfer has a varied geometry along the edge. The average geometry of the chamfer varies with cutting depth. A depression in the shaped working surface is oriented with the varied chamfer and facilitates forming the varied chamfer. A non-planar interface has depressions oriented with depressions in the shaped working surface to provide support to loads on the working surface of the cutter when used.

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