Use of selected ester oils in drilling fluids and muds
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United States of America Patent
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Aug 3, 1993
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N/A
app pub date -
Sep 6, 1991
filing date -
Dec 19, 1988
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Abstract
Invert emulsion muds for drilling of gas and oil, which are environmentally safe, and which contain: A. a continuous oil phase composed predominantly of at least one monocarboxylic acid ester of a C.sub.2 -C.sub.12 monofunctional alkanol wherein the monocarboxylic acid contains from 16 to 24 carbon atoms and is olefinically mono- or poly-unsaturated, B. a disperse aqeuous phase, C. at least one emulsifier, D. at least one weighting agent, E. at least one fluid loss additive, and F. a mild alkaline reserve.
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