FIELD: protection against internal corrosion of injection well used for injection of fresh water into system maintaining formation pressure when oil field is developed. SUBSTANCE: in compliance with method keeping formation pressure under conditions of packer-free operation of wells tubular annulus between casing string and its tubing string is injected with fresh water or fresh water with corrosion inhibitor and bactericide. . Water is fed continuously or periodically into tubular annulus through injector in upper part of tubing string or through pipe union or through buffer gate. EFFECT: increased corrosion resistance and operational reliability of structure of injection well.
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