Importance

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Abstract

Superabrasive cutting elements for use in drilling subterranean formations, and drill bits so equipped. The cutting element includes a superabrasive table between about 0.090 inch and 0.120 inch thickness, mounted to a supporting cemented carbide substrate. The superabrasive table includes a two-dimensional cutting face with a first surface transverse to the longitudinal axis of the cutter and a second, planar engagement surface or buttress plane oriented at a small, acute angle with respect to the first surface and having a cutting edge along at least a portion of its periphery adjacent the lateral periphery of the cutter. A tapered side surface on the superabrasive table to the rear of the cutting edge flares outwardly, terminating in a side surface parallel to the cutter axis, continuing to the supporting substrate. In a preferred embodiment, the cutter is substantially round in transverse cross-section, and the tapered side surface of the table is a frustoconical surface extending at least partially about the cutter.

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First Claim