FIELD: oil and gas production. SUBSTANCE: fluid is composed of, wt %: starch 1.0-2.0, caustic soda 0.04-0.16, surfactant (additionally) 0.05-0.1, sodium metasilicate (additionally) 0.2-1.2, urea perhydrate 0.07- 0.1, potassium chloride 3.0, and water - the rest. EFFECT: reduced filtration characteristics and minimized effect on permeability on formation bottom zone. 2 tbl
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