FIELD: oil and gas production industry. SUBSTANCE: this relates to isolation of passages in water-bearing beds, including those with mineralized brine water. Improved efficiency of isolation operations in wells with mineralized brine water is achieved by application of working solution which creates water-proofing screen due to its chemical reaction with ions of various chemical elements present in brine water. According to method, injected into well is product of interaction of phosphoric acid and carbamide with density of 1.285-1.325 g/cm3. EFFECT: high efficiency. 1 cl, 2 tbl
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