Drill bit with rows of cutters mounted to present a serrated cut

Details Drill bit with rows of cutters mounted to present a serrated cut Drill bit with rows of cutters mounted to present a serrated cut

1996-09-25

2000-12-26

Bagnell, David

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175431, E21B 1000, E21B 1008

Patent

active

061643947

ABSTRACT:
A fixed cutter drill bit particularly suited for plastic shale drilling includes rows of cutter elements arranged so that the cutting tips of the cutters in a row are disposed at leading and lagging angular positions so as to define a serrated cutting edge. The angular position of the cutting tips of cutters in a given row may be varied by mounting cutters with different degrees of positive and negative backrake along the same blade. Preferably, within a segment of a given row, the cutters alternate between having positive backrake and negative backrake while the cutters mounted with positive backrake are more exposed to the formation material than those mounted with negative backrake. Nozzles are provided with a highly lateral orientation for efficient cleaning. The positive backrake cutter elements have a dual-radiused cutting face and are mounted so as to have a relief angle relative to the formation material. Cutter elements in different rows are mounted at substantially the same radial position but with different exposure heights, the cutter elements with positive backrake being mounted so as to be more exposed to the formation than those with negative backrake.

REFERENCES:
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patent: 5549171 (1996-08-01), Mensa-Wilmot et al.
patent: 5551522 (1996-09-01), Keith et al.
patent: 5582261 (1996-12-01), Mensa-Wilmot et al.
patent: 5592996 (1997-01-01), Keith et al.
patent: 5607024 (1997-03-01), Keith et al.

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