FIELD: oil and gas well drilling.
SUBSTANCE: invention is related to water-based drilling fluids. The lubricating additive for drilling fluids contains, wt%: synthetic hydrocarbon fluid 65-89.5; ester 10-34.5; nonionic or zwitterionic surfactant 0.5-2. As an ester, the reaction product of a polyhydric alcohol and at least one of the higher fatty acids of tall oils or the reaction product of a polyhydric alcohol and distilled tall oil or crude tall oil obtained as a result of an acid-catalytic esterification reaction is used.
EFFECT: preservation of high lubricating properties, as well as an increase in anti-sticking properties at the "metal-clay cake" and "metal-metal" boundaries in fresh and mineralized drilling fluids at low temperatures.
5 cl, 1 dwg, 4 tbl
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