Drilling mud dispersants

Details Drilling mud dispersants Drilling mud dispersants

1983-12-05

1985-05-21

Guynn, Herbert B.

Compositions

Leather or fur treating

252 85A, C09K 702

Patent

active

045185107

ABSTRACT:
Dispersants useful in aqueous drilling mud formulations employed in the drilling of subterranean wells where high temperature and high pressure environments are encountered are disclosed. The dispersants, when used in amounts of about 0.1 to 25 ppb provide muds containing colloidal material suspended in an aqueous medium with improved high temperature and high pressure stability. The dispersants are water soluble sulfonated vinyl toluene-maleic anhydride copolymers which have a molar ratio of vinyl toluene to maleic anhydride of about 1:1 to less than about 2:1, a molecular weight of 1,000 to 25,000 and at least about 0.7 sulfonic acid groups per vinyl toluene unit.

REFERENCES:
patent: 2650905 (1953-09-01), Fordyce et al.
patent: 2718497 (1955-09-01), Oldham
patent: 3332872 (1967-07-01), Oakes
patent: 3730900 (1973-05-01), Perricone et al.

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