FIELD: drilling.
SUBSTANCE: present invention relates to drilling fluid lubricating compositions for use in drilling operations. Lubricating additive for drilling fluid contains, wt %: liquid hydrocarbon component - used motor oil 85–87.27; fatty acids of vegetable oils up to 3; oleic acid 0.2–0.8; depressant additive 0.03–0.05; stearic acid 2.5; a mixture of triethanolamine with monoethanolamine and/or diethanolamine 8.0–8.6; ethoxylated alkylphenol 2. Fatty acids of vegetable oils with an acid number of at least 180 units are used in the lubricant additive.
EFFECT: high lubricating and anti-grease properties of the lubricant additive, the formation of a stable film on the metal surface.
1 cl, 6 tbl
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