Rotary earth drilling bit

Details Rotary earth drilling bit Rotary earth drilling bit

1982-04-29

1984-04-03

Purser, Ernest R.

Boring or penetrating the earth

Bit or bit element

With fluid conduit lining or element

175403, 175387, E21B 1060

Patent

active

044402473

ABSTRACT:
A blade-type rotary drill bit having radially divergent cutting blades arranged in two arrays and equipped with cutting blanks having upset cutting surfaces formed of an abrasive material such as diamond or the like. The blades in one array cut to the center of the bit to provide a conically shaped core volume and the blades of the second array terminate short of the axis of the bit to define a somewhat larger core volume. The bit is equipped with discharge ports and baffles whereby drilling fluid issuing from the discharge ports moves downwardly and then inwardly to the center of the bit. The cutting blanks located on the second array of blades cut in a common set of tracks which are at least partially different from and compliment the tracks cut by the cutting blanks on the blade of the first array.

REFERENCES:
patent: Re26669 (1969-09-01), Henderson
patent: 3059708 (1962-10-01), Cannon et al.
patent: 3099324 (1963-07-01), Kucera et al.
patent: 3163245 (1964-12-01), York
patent: 3180440 (1965-04-01), Bridwell
patent: 3220497 (1965-11-01), Mori
patent: 3298451 (1967-01-01), Eckel et al.
patent: 3693735 (1972-09-01), Cortes
patent: 4073354 (1978-02-01), Rowley et al.
"Recent Developments in Stratapax Blank Bits", Offenbacher, L. A., presented at the ASME Petroleum Mechanical Engineering Conference, Tulsa, OK, Oct. 28-30, 1979.

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