| abstract |
The invention describes the use of selected esters which are flowable at room temperature and have flash points above 80 ° C. from monocarboxylic acids of synthetic and / or natural origin with 6 to 11 carbon atoms and mono- and / or polyfunctional alcohols as the oil phase or constituent of the oil phase of invert Drilling muds that are suitable for the environmentally friendly development of oil or gas deposits and that contain a disperse aqueous phase together with emulsifiers, weighting agents, fluid loss additives and, if desired, other conventional additives in a closed oil phase. In a further embodiment, the invention relates to invert drilling fluids of the type specified, which are characterized in that the oil phase contains esters of monocarboxylic acids of synthetic and / or natural origin with 6 to 11 carbon atoms and with 1- and / or polyfunctional alcohols, if desired in a mixture with other components from the class of ecologically compatible compounds. |