FIELD: chemistry.
SUBSTANCE: invention relates to drilling of oil, gas and geological-exploration wells, namely to lubricant additives for drilling mud. Lubricating additive to drilling mud contains, wt%: vegetable oil 40–80; hydrocarbon synthetic liquid 10–40; fatty acid ester of vegetable oils 5–20; nonionic or zwitterioni surfactant 0.5–2.
EFFECT: maintaining high values of lubricating properties, as well as high anti-gripping properties on the boundary "metal-clay crust" and "metal-metal" in fresh and mineralized drilling muds.
1 cl, 4 tbl
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