FIELD: oil and gas production. SUBSTANCE: invention is applicable for crude oil treatment on oil-field and oil-processing plants. To each iron- and hydrogen sulfide-containing stream, demulsifier is added, after which streams are combined, pumped through furnace, and directed into high-extent dehydration and desalting stage. There, released water is separated, supplemented with chelating agent and added to hydrogen sulfide-containing oil stream before the second separation step. EFFECT: reduced chelating agent consumption, improved quality of discharged water, and enabled maintaining formation pressure. 1 dwg, 1 tbl
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