Drill bit and other downhole tools having electro-negative surfa

Details Drill bit and other downhole tools having electro-negative surfa Drill bit and other downhole tools having electro-negative surfa

1993-05-07

1994-07-19

Britts, Ramon S.

Boring or penetrating the earth

With tool shaft detail

175425, E21B 1700

Patent

active

053300165

ABSTRACT:
Various steel, downhole tools and components of a drill string, including, as examples, a PDC drill bit, a rotary rock bit, a cross-over sub, a stabilizer, a reamer, a hole enlarger and a coring bit, are selectively treated to cause certain of their parts to be electro-negative with respect to steel, and certain other parts to either have the same electro-negativity as steel, or to be treated to be electro-positive with respect to steel.

REFERENCES:
patent: 3762485 (1973-10-01), Chesser et al.
patent: 3788407 (1974-01-01), Lorenz et al.
patent: 4119511 (1978-10-01), Christensen
patent: 4185706 (1980-01-01), Baker, III et al.
patent: 4187921 (1980-02-01), Garner
patent: 4673044 (1987-06-01), Bigelow et al.
patent: 4856601 (1989-08-01), Raney
patent: 4883132 (1989-11-01), Tibbitts
patent: 4913244 (1990-04-01), Trujillo
patent: 5216917 (1993-06-01), Detournay

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