WELL REPAIR METHOD Russian patent published in 2015 - IPC E21B37/06 

FIELD: oil and gas industry.

SUBSTANCE: in well repair method that includes circulation of washing compound in the well circulation of washing compound is performed continuously during 1-3 h at consumption rate of 4-6 l/s with bypassing of washing compound to a tank filled partially with increase in level of compound available in it at initial volume of washing compound exceeding the design volume for well treatment per 0.5-2%, level of washing compound is controlled in the tank, at its reduction circulation rate is decreased, at its increase circulation rate is increased, reaction products are washed out from the well by water in volume corresponding to the well volume and bottomhole zone is washed by water in volume of 1.5-2.0 of the well volume, at that the following mixture, in volume parts, is used as washing compound: solvent of asphaltic-resinous-paraffin deposits RS-1210 - 100-400, chemical reagent ITPS-04-A - 15-40, service water with density from 1.0 to 1.18 g/cm³ - 600-900.

EFFECT: improved efficiency of wells cleaning at low temperature from asphaltic-resinous-paraffin deposits accumulated for long period of time.

2 cl, 3 ex