METHOD OF REPAIRING WELL Russian patent published in 2016 - IPC E21B37/06 

FIELD: oil industry.

SUBSTANCE: invention relates to oil industry and can be used during well cleaning. Method includes washing of a bottomhole by circulation of detergent composition in the well along a flexible pipe and a tubing string. Bottomhole is washed by formation water until discharge of its part, then - by gas-liquid mixture; then, the pressure is released to the atmospheric value; formation water is added into the well; detergent composition of formation water, water-soluble surfactant "ITPS-04-A" and organic solvent "MIA-prom" is pumped via the tubing string and is extracted via a flexible pipe inside the tubing string; after that, the well is filled with a solution of surfactant ML-81B in formation water, foamed to 40-60 % by air with the amount of oxygen less than 9 %; then the well is washed by circulation of the said solution, reaction products are washed away by direct and reverse flushing, the pressure is released to atmospheric value, the well is filled with formation water, the bed intake is determined, mud acid is pumped into the bottomhole zone; then, there is carried out dwell for reaction; reaction products are washed away with a solution of surfactant ML-81B in formation water, foamed to 40-60 % by air with the amount of oxygen less than 9 %; then the bed intake is determined.

EFFECT: higher efficiency of well cleaning.

1 cl