FIELD: operation of underground storage tanks made in soluble rocks, particularly, in rock salt for storage of liquid and gaseous products, mainly, of hydrocarbon materials. SUBSTANCE: method provides for detection of cement ring leaking in well annular pressure of cemented sections. Novelty in claimed method is use of plugging mortar in form of concentrated brine heated up to 60-90 C with addition of mechanical impurities. Plugging mortar is held under pressure until brine crystallization and penetration of stick-plastic rocks into fracturing zone. EFFECT: higher efficiency of repair of process wells of underground storage tanks. 3 cl, 2 dwg
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