FIELD: soil or rock drilling.
SUBSTANCE: invention relates to mud flush used in oil wells drilling. Polysalt biopolymer mud flush for oil wells drilling contains, by weight: caustic or sodium carbonate 0.05–0.10; sodium salt 22.5–24.0; potassium chloride 2.0–3.0; bischofite 5.0–6.0; acrylic polymer 0.05–0.15; carboxymethyl cellulose 0.25–0.40; biopolymer reagent of xanthan type 0.3–0.4; carbonate colmatant 3.0–6.0; lubricant additive, which is a composition of triglycerides, glycols and non-ionic surfactants, 0.3–1.5; defoamer 0.03–0.05; water and the rest.
EFFECT: technical result is an increase in the technological efficiency of the mud flush and an improvement in the quality of uncovering of productive terrigenous reservoir of oil and gas.
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