Drilling mud dispersants
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United States of America Patent
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-
May 21, 1985
Grant Date -
N/A
app pub date -
Dec 5, 1983
filing date -
Dec 5, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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