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

FIELD: oil and gas industry.

SUBSTANCE: method includes running-in of tubing string with packer to casing pipe, packer setting, determination of specific injectivity for each failure in casing pipe, isolation of failures. Two-position valve is installed over packer, tubing string is run-in up to bottom hole and wire trip of casing pipe is made. Packer is set over the lower failure, then initial specific injectivity of failure is determined. When specific injectivity is below 0.5 m³/(h·MPa) isolation of failure location is not performed. When specific injectivity is more than 0.5 m³/(h·MPa) pumping and flushing of locking compound is made to failure location, remainders of locking compound are washed, final specific injectivity is determined for this failure. The above operations are made against each failure location; thereafter packer is uplifted into head location of auxiliary small-sized extreme line casing. Two-position valve is actuated. Pipe casing is leak tested by swabbing. Auxiliary small-sized extreme line casing is run-in and cement mortar is pumped though till it reaches head of auxiliary extreme line casing.

EFFECT: improving efficiency, simplifying technology, reducing specific amount of metal per structure.

5 dwg