FIELD: water treatment. SUBSTANCE: parent mineralized water is limed, mixed with heating steam condensate, softened by Na-cation exchange and divided for two flows. One is directed for vapor-generator feeding, and blowing of its is used for cationite regeneration. Spent regeneration solution after calcium sulfate separation is mixed with other flow of softened water, heated with steam from vapor-generator up to 150 C and pumped into oil stratum. As a result of mixing concentration of calcium sulfate is decreased that prevents scale precipitation in heat-exchanger and hole. Method is used for hot water preparation from mineralized water for oil strata treatment in order to increase oil output. EFFECT: improved method of water treatment. 1 dwg, 3 tbl
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