Earth boring bit for soft to hard formations

Details Earth boring bit for soft to hard formations Earth boring bit for soft to hard formations

1985-08-02

1987-06-16

Novosad, Stephen J.

Boring or penetrating the earth

Bit or bit element

Magnetized or with magnet

175339, 175410, E21B 1018, E21B 1050

Patent

active

046730443

ABSTRACT:
A drill bit having thermally stable PCD cutting elements includes a matrix body element having a plurality of spaced cutting elements supported in a body of matrix material such that a substantial portion of the cutter is above the body matrix and a minor portion is received within the body matrix. The cutters have side surfaces exposed and are so positioned that at least in some of the cutters more surface area of one side face is exposed as compared to the other side faces. The cutter support may include a small pad of matrix material to reduce the loading directly on the PCD. In a preferred form the PCD elements are mounted on pads or blades formed by spaced channels. The hydraulics are straight radial flow and improved hydraulic flow is achieved through the use of waterways which concentrate the fluid flow near the face of the cutters. In one form, improved hydraulics are obtained by having one fluid discharge port for each of the radially disposed fluid channels. Various forms and arrangements are disclosed.

REFERENCES:
patent: 3127946 (1964-04-01), Deely
patent: 3215215 (1965-11-01), Kellner
patent: 3938599 (1976-02-01), Horn
patent: 4207954 (1980-06-01), Jerome
patent: 4244432 (1981-01-01), Rowley et al.
patent: 4491188 (1985-01-01), Grappendorf
patent: 4499959 (1985-02-01), Grappendorf et al.
patent: 4515226 (1985-05-01), Mengel et al.
patent: 4529047 (1985-07-01), Meskin et al.
patent: 4586574 (1986-05-01), Grappendorf

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