Low toxicity oil-based drilling fluid

Compositions – Leather or fur treating

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252 8515, C09K 706, C09K 702

Patent

active

047879904

ABSTRACT:
Disclosed is a low toxicity oil for use in drilling fluids. The oil consists essentially of branched- and cyclic-paraffins having 11 to 17 carbon atoms per molecule and further having a low aromatic content of less than about 1% and a low normal-paraffin content of less than about 5%. The low polynuclear aromatic oil is useful in both oil-based and water-based drilling mud, particularly where low toxicity and lack of water sheen are important such as in offshore drilling environments. The oil also has the advantage of being non-fluorescent so that it does not mask UV fluorescence of formation crudes produced from the drill cuttings in wildcatting operations.

REFERENCES:
patent: 2584930 (1952-02-01), Shinouda
patent: 3206410 (1965-09-01), Moller et al.
patent: 3406115 (1968-10-01), White
patent: 3528914 (1970-09-01), Darley
patent: 3668129 (1972-06-01), Willett
patent: 3849316 (1974-11-01), Motley et al.
patent: 3850248 (1974-11-01), Carney
patent: 3948782 (1976-04-01), Dreher et al.
Chilingarian, G. V., and Vorabutr, P., Developments in Petroleum Science 11, Drilling and Drilling Fluids, N.Y., Elsevier Sci. Pub., 1983, p. 758.

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