Drilling fluid

Details Drilling fluid Drilling fluid

1973-09-07

1976-04-27

Guynn, Herbert B.

Compositions

Leather or fur treating

252 85C, C09K 702

Patent

active

039533360

ABSTRACT:
Aqueous mixtures of fermentation-produced polysaccharides and cellulose derivatives such as hydroxyethylcellulose are used as drilling fluids. They exhibit low viscosity at high shear rates and high viscosity at low shear, causing them to be ideally suited for rapid drilling rates and good cuttings carrying capacity. These fluids are stable in the presence of high calcium ion and salt concentrations and can be used in drilling troublesome shale sections without hydration problems. The addition of KCl in modest amounts improves shale stabilization.

REFERENCES:
patent: 2570947 (1951-10-01), Himel et al.
patent: 3105046 (1963-09-01), Fischer
patent: 3319715 (1967-05-01), Parks
patent: 3625889 (1971-12-01), Branscum
patent: 3696035 (1972-10-01), Nimerick
patent: 3727688 (1973-04-01), Clampitt
patent: 3878110 (1975-04-01), Miller et al.
Rogers, Composition and Properties of Oil Well Drilling Fluids, Third Edition, Pub. 1963, pp. 406-410.

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