Rotary drill bits

Details Rotary drill bits Rotary drill bits

1991-10-31

1993-09-14

Britts, Ramon S.

Boring or penetrating the earth

Bit or bit element

Specific or diverse material

E21B 1046

Patent

active

052440397

ABSTRACT:
A rotary drill bit for drilling holes in subsurface formations comprises a bit body having a shank for connection to a drill string, a plurality of preform primary cutting elements mounted on the bit body and defining a primary cutting profile having a downwardly convex nose portion. There are associated with at least certain of the primary cutting elements respective secondary elements which are spaced inwardly of the primary profile. The distance of the secondary elements from the primary profile, when measured in a direction perpendicular to said profile, is generally greater for secondary elements nearer the nose portion than it is for secondary elements further away from the nose portion, and is preferably such that the vertical distance of the secondary elements from the profile is substantially constant.

REFERENCES:
patent: 4429755 (1984-02-01), Williamson
patent: 4475606 (1984-10-01), Crow
patent: 4545441 (1985-10-01), Williamson
patent: 4718505 (1988-01-01), Fuller
patent: 4823892 (1989-04-01), Fuller
patent: 4889017 (1989-12-01), Fuller et al.
patent: 4942933 (1990-07-01), Ban et al.

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