FIELD: oil and gas industry.
SUBSTANCE: invention relates to oil and gas industry, particularly to drilling fluids. Invert-emulsion drilling mud for prevention of complications during drilling of wells at deposits characterized by presence of salt deposits and formations with abnormally low bed pressure contains, wt %: dispersion medium – industrial oil I-20A 49.0–58.0 and alpha-olefins C12–C14 19.0–20.5; "BENTOLUX OVM" organobentonite 2.5–3.0; synthetic polymer latex 1.5–2.0; emulsifier MR-150 2.5–3.0; water repellent ADR-40 0.7–1.0; disperse phase – 30 % aqueous solution of CaCl2 12.5–24.8; marble powder to required density over 100 %.
EFFECT: technical result is control of structural-rheological and filtration properties of drilling fluid, formation of stable emulsion, inert to drilled rock, prevention of complications during drilling.
1 cl, 1 dwg, 1 tbl
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