USE OF SELECTED FATTY ALCOHOLS AND THEIR MIXTURES WITH CARBOXYLIC ACID ESTERS AS LUBRICANT COMPONENTS IN WATER-BASED DRILLING FLUID SYSTEMS FOR SOIL EXPLORATION

European Patent Office Patent

PATENT NO 0948576
APP PUB NO EP-0948576-A1
SERIAL NO

97951158

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Abstract

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The invention relates to the use of linear and/or branched fatty alcohols containing at least 12 carbon atoms in the molecule and/or to the use of mixtures of such fatty alcohols with carboxylic acid esters as a lubricating additive in water-based drilling fluids for their use in geological exploration by drilling. The fatty-alcohol-based lubricants or lubricant systems are particularly suitable for use in water-based alkali metal silicate drilling muds which are known to be distinguished by comparatively high pH values. The additives according to the invention combine their lubricating effect with a foam-suppressing effect, i.e. prevent unwanted foaming.

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