FIELD: oil and gas production. SUBSTANCE: defoaming agent contains 2 to 40 % of defoaming base: colloidal calcium and aluminum silicates or aqueous- alcoholic solutions of sodium ethyl(methyl)siliconates, or tall sludge- lignin, 10 to 50% of hydrocarbon solvent: diesel fuel with density 0.79- 0.86 g/cu. cm and iodine number n=2-6, 0.05 to 1.50% of emulsifier: light tall oil, and water (the balance). EFFECT: enhanced defoaming efficiency and extended application area of agent, in which substitution of defoaming base is allowable. 3 tbl, 4 ex
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