WELL REPAIR METHOD Russian patent published in 2013 - IPC E21B29/10 

FIELD: oil and gas industry.

SUBSTANCE: liner and anchor is lowered to the repair interval; anchor is mounted; liner walls are expanded till they are pressed to the well walls. Works are performed in the well with at least a six-inch worn-out production string; perforation interval of the production string is covered with the liner at least 2 m on each side. Works with the liner are performed in water solution of surface-active substance. A new production string is lowered to the well; inter-tube space is cemented between old and new production strings; the new production string at the productive formation interval, a cement ring between the liner and the new production string, the liner and the old production string is perforated.

EFFECT: improving sealing reliability.