Oligoglyercol fatty acid ester additives for water-based drilling fluids
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United States of America Patent
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Apr 3, 2012
Grant Date -
Dec 2, 2010
app pub date -
Sep 12, 2008
filing date -
Sep 14, 2007
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Abstract
The use of oligoglycerol fatty acid esters, prepared from
- (a) an acid component chosen from (a1) fatty acids of the general formula (I)R—COOH (I)in which R represents a saturated or unsaturated, branched or linear alkyl or alkenyl radical having 7 to 21 C atoms, and/or(a2) dicarboxylic acids and/or(a3) dimer fatty acids and/or(a4) oligomer fatty acids and/or(a5) hydroxy fatty acids with (b) a polyol component which is chosen from oligoglycerols or alkoxylates of oligoglycerols, as an additive in water-based drilling mud compositions for improving the lubricating action of these mud systems, is described.
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