Cutting structures for rotary drill bits

Details Cutting structures for rotary drill bits Cutting structures for rotary drill bits

1988-11-10

1990-02-06

Kisliuk, Bruce M.

Boring or penetrating the earth

Bit or bit element

Cutting edge self-renewable during operation

175410, E21B 1056

Patent

active

048982520

ABSTRACT:
A cutting structure for a rotary drill bit includes a cutting element 30 having a front layer 32 formed of polycrystalline diamond, bonded to a backing layer 33 formed of tungsten carbide. The cutting element is bonded to a carrier 33 which is formed of a number of detachable individual elements having means holding them in position such that, upon wear of the cutting structure in use, the holding means of an element engaging the formation will eventually fail, causing detachment of that element from the carrier, and thereby reducing the area of the cutting structure in contact with the formation.

REFERENCES:
patent: 2203747 (1940-06-01), Sandstone
patent: 2833520 (1958-05-01), Owen
patent: 2846193 (1958-08-01), Chadderon
patent: 4128136 (1978-12-01), Generoux
patent: 4324300 (1982-04-01), Logan, Jr.
patent: 4719979 (1988-01-01), Jones

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