FIELD: oil and gas production industry. SUBSTANCE: method relates to fortification of wells and can be used in process of isolation and restoration operations in overhaul repair of wells. According to method, perforated is section of casing string in interval where high-plastic rock matter is present. Rock matter is heated within boundaries of perforated section. Heating is discontinued when washing fluid starts coming from casing clearance to well head. Volume of this washing fluid must be equal to volume of casing clearance of interval being isolated. Heated location is cooled down to bed temperature. Realization of aforesaid method prevents crushing of casing string. EFFECT: higher efficiency.
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