Low pressure drill bit

Details Low pressure drill bit Low pressure drill bit

1988-11-22

1989-12-19

Kisliuk, Bruce M.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175393, E21B 1060

Patent

active

048876771

ABSTRACT:
A drill bit includes a drill bit body, a cutting member and a fluid course extending in front of the cutting member. The fluid course includes a progressively widening diffuser having a particular design which allows pressure recovery in a fluid flowed through an axial bore of the drill bit body, through a narrow throat of the fluid course in front of the cutting member, and out the progressively widening diffuser of the fluid course. As a result, a significantly reduced pressure is obtained in front of the cutting member, which reduced pressure is below a borehole pressure where the drill bit is used.

REFERENCES:
patent: 2946565 (1960-07-01), Williams
patent: 3455402 (1969-07-01), Tiraspolsky
patent: 3825080 (1974-07-01), Short
patent: 4223747 (1980-09-01), Marais
patent: 4239087 (1980-12-01), Castel et al.
patent: 4240513 (1980-12-01), Castel et al.
patent: 4452324 (1984-06-01), Jurgens
patent: 4515227 (1985-05-01), Cerkovnik
patent: 4633958 (1987-01-01), Mouton
patent: 4696354 (1987-09-01), King et al.
patent: 4727946 (1988-03-01), Barr et al.

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