Earth boring drill bit with chip breaker

Details Earth boring drill bit with chip breaker Earth boring drill bit with chip breaker

1995-02-28

1996-12-10

Novosad, Stephen J.

Boring or penetrating the earth

Processes

175429, 175431, E21B 1046, E21B 1060

Patent

active

055822584

ABSTRACT:
A drill bit for boring an earth formation is designed for rotation in a given direction. The bit body includes an operating face with at least one cutting element formed thereon. A cutting surface formed on the cutting element faces in a forward direction with respect to the direction of rotation. A cutting edge is formed on the cutting surface and is embedded in the earth formation during boring so that the formation is received against a portion of the cutting surface. The cutting element creates successive formation chips during boring which grow in length during bit rotation. A chip breaker formed adjacent the cutting surface imparts a strain to the chip by bending and/or twisting the chip and thereby increases the likelihood that it will break off. In one aspect, fluid flows in a fluid course formed in front of the cutting element during boring. Twisting increases the surface area of the chip presented to fluid in the fluid course which further increases the likelihood that the chip will break.

REFERENCES:
patent: 4558753 (1985-12-01), Barr
patent: 4574895 (1986-03-01), Dolezal et al.
patent: 4913244 (1990-04-01), Trujillo
patent: 5115873 (1992-05-01), Pastusek
patent: 5449048 (1995-09-01), Thigpen et al.

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