FIELD: oil and gas production industry. SUBSTANCE: this relates to repair and maintenance of casing strings and improving its efficiency. According to method, zone of disturbed tightness of casing string is covered from inside of casing string by patch made of deformable pipe produced from thermoplastic material, for example polyethylene. Excess pressure is created due to expansion of self-heating and self-expanding material such as limestone mixture for mining and drilling operations. Pipe produced of thermoplastic material is filled with this mixture before covering zone of disturbed tightness of casing string. EFFECT: higher efficiency. 2 cl
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