FIELD: oil and gas industry. SUBSTANCE: method protecting operating string of injection well against attack of pumped chemically corrosive water includes setting of tubing string in well at needed depth, filling of tubular annulus with sealing compound. Glass reinforced plastic pipes are employed in the capacity of tubing string. Walls of operating well are examined for chemical and physical wear prior to sinking of tubing string. Cement mortar is used as substance with sealing property. Tubular annulus is filled with corrosion inhibitor before injection of cement mortar. If wear of operating string exceeds permissible level string of glass reinforced plastic pipes of maximum possible diameter is sunk and cemented to wellhead. EFFECT: protection of operating string against corrosion, diminished technical effect on environment. 1 cl, 2 dwg
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