FIELD: oil production industry. SUBSTANCE: this relates to field treatment of oil. Reduced consumption of chelating agent and improved quality of oil preparation are achieved by combined treatment of various grades of oil with delivery of hot water to sulphur-containing oil before second stage of separation. Hot water is discharged from stage of deep dewatering and desalinization. Various grades of oil are mixed, and emulsion is heated before second stage of separation. EFFECT: high efficiency. 1 dwg, 1 tbl
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