REPAIR METHOD OF STRING WITH DEFECT SECTION AND INTERNAL TAPERING OF STRING Russian patent published in 2010 - IPC E21B29/10 

FIELD: oil-and-gas production.

SUBSTANCE: method includes definition of all information by defect interval, downlifting and installation of additional volatile string with fixing opposite to defect interval with following cementing. After definition of the interval of defect section it is implemented preliminary cementing of internal defect section by all length. After solidification of cement it is implemented mill operation of defect section. Before downlifting additional volatile string higher than defect section is outfitted by external centraliser. From the top additional string is outfitted by mechanical tinted boxes, fixing it relative to string so that additional string overlaps all cut defect section.

EFFECT: there are increased technological properties, increases reliability.

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