Multiple diamond layer polycrystalline diamond composite cutters

Details Multiple diamond layer polycrystalline diamond composite cutters Multiple diamond layer polycrystalline diamond composite cutters

1995-08-22

1998-03-03

Tsay, Frank

Boring or penetrating the earth

Bit or bit element

Specific or diverse material

175434, E21B 1046

Patent

active

057224994

ABSTRACT:
An improved polycrystalline diamond composite ("PDC") cutter comprises a single or a plurality of secondary PDC cutting surfaces in addition to a primary PDC cutting surface. The two cutting surfaces are spaced apart, resulting in enhanced cutter efficiency and useful life. The primary PDC cutting surface is a polycrystalline diamond layer on an exposed end face of the cutter. A secondary cutting surface is formed by a polycrystalline diamond layer embedded within the body of the cutter. The secondary cutting surface can have a larger diameter than the primary cutting surface so that the forward end of the cutter parallels rock formation during drilling and both cutting surfaces engage the rock formation.

REFERENCES:
patent: 4225322 (1980-09-01), Knemeyer
patent: 4255165 (1981-03-01), Dennis et al.
patent: 4268276 (1981-05-01), Bovenkerk
patent: 4604106 (1986-08-01), Hall et al.
patent: 5119714 (1992-06-01), Scott et al.
patent: 5549171 (1996-08-01), Mensa-Wilmot et al.

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