FIELD: oil, gas and coke-chemical industries.
SUBSTANCE: invention relates to oil and gas industry. Weighted saline drilling fluid for the opening of productive layers with abnormally high reservoir pressure contains, wt. %: sodium formate 37–40; polysaccharide of the xanatan type “Glamin” 0.20–0.25; modified starch "MK-3" 1.10–1.20; hydrophobic liquid "Basis-GS" 1.00–1.20; lubricant additive "SMEG" 1.25–1.50; Polydefom defoamer 0.15–0.20; clogging additive MP-4 10; water is the rest; weighting additive to the required density in excess of 100 wt. %.
EFFECT: technical result is preservation of reservoir properties and prevention of complications during drilling and primary opening of productive formations in conditions characterized by high bottomhole temperatures and abnormally high reservoir pressures.
3 cl, 1 dwg, 2 tbl
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