METHOD OF REMOVING DEPOSITS FROM WELL EQUIPPED WITH ELECTRIC CENTRIFUGAL PUMP Russian patent published in 2016 - IPC E21B37/00 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry and can be used for cleaning wells from asphalt-resin-paraffin, sulphide-containing, salt and other deposits. When removing deposits from well equipped with electric centrifugal pump, hot oil is pumped into annular space and circulated through column of tubing strings. Before pumping oil into annular space centrifugal pump is started, and when pumping hot oil, a third of volume of heated oil with temperature of 40 °C is fed at a rate of not more than 6 l/s and pressure of not more than 4 MPa, after which 2/3 of volume of hot oil with temperature close to 80 °C is pumped, wherein last 2 m³ of hot oil is pumped in natural cooling mode, after which well is left in operation.

EFFECT: higher efficiency of well cleaning.

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