FIELD: repair and sealing operations on wells of oil and gas deposits, particularly, methods of recovery of seal of casing-string-borehole annulus. SUBSTANCE: method consists in treatment of casing string in interval of securing of casing string-borehole annulus with variable polarity of electric current with its density of 20-40 A/sq.m. Simultaneously, treatment is additionally carried out with variable polarity electric current and its periodically varying density from 1 to 20 A/sq.m. In doing so, time for treatment with current of positive polarity exceeds that for treatment with current of negative polarity. EFFECT: higher efficiency of sealing of casing string-borehole annulus and elimination of flows-over in casing string-borehole annulus. 2 dwg, 1 ex
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