FIELD: drilling. SUBSTANCE: esters of saturated and/or unsaturated monocarboxylic acids (number of carbon atoms is up to 24) with monoatomic lower and/or higher alcohols and/or polyatomic lower alcohols that can be emulsified in water are used as an oil phase of liquids used for drilling in the form of emulsion oil-in-water. EFFECT: enhanced quality of esters. 6 tbl
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