Drilling fluids and muds containing selected ester oils

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 C2C12 monofunctional alkanol wherein the monocarboxylic acid contains from 12 to 16 carbon atoms and is aliphatically saturated, B. a disperse aqueous 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.