FIELD: soil or rock drilling.
SUBSTANCE: invention relates to drilling and is intended for use in water-based drilling fluids when drilling oil and gas wells during development of deposits. Lubricating additive for drilling mud contains, wt%: oil extract 25.0-40.0; oleic acid and optionally lanolin 0.5-1.5; fat concentrate or fatty acids for industrial processing 0.5-1.5; depressant additive MAXOIL-D or IRFAGL ™ 720 P 0.2-1.6; oil phase - industrial oil or spent industrial oils - balance.
EFFECT: technical result is increased lubricating capacity and expanded raw material base.
1 cl, 3 tbl, 4 ex
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