THE USE OF SELECTED ESTER OILS IN DRILLING FLUIDS AND MUDS

摘要

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 C2-C12 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.