FIELD: oil and gas industry.
SUBSTANCE: invention relates to oil and gas industry, namely to clayey emulsion drilling mud for drilling of directional and horizontal oil and gas wells with various deviations from vertical, for opening of productive formations with abnormal bed pressure. Emulsion drilling mud contains, wt%: hydrocarbon phase and surfactant – MF-824 reagent 35–39; emulsion stabilizer – modified starch MultiStar 0.58–1.27; xanthum gum 0.06–0.25; organic inhibitor of swelling shale rock BIO XX 0.58–0.63; calcium carbonate 2.94–3.2; sodium hydroxide 0.26; bactericide 0–0.05; water – balance.
EFFECT: low density of drilling mud, high inhibiting and lubricating properties, low degree of contamination of productive formation.
1 cl, 5 tbl, 2 ex
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