METHOD OF REMOVING DEPOSITS FROM WELL EQUIPPED WITH BOTTOM-HOLE 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 a well, equipped with bottom-hole pump from asphalt-resin-paraffin, sulphide containing, salt and other deposits. Method comprises increasing number of rocking times of pump jack to a state, where there is no hanging of rod string, stopping pump jack, installing balance beam of pump jack in upper position, opening valve on tube and annular space, pumping process liquid with pumping unit, without exceeding allowable on production string, determining presence of circulation. While pumping oil in annular space oil is heated to temperature of 40-45 °C and a third of volume of heated oil is pumped with flow rate of not more than 6 l/s and pressure of not more than 4 MPa, then oil is heated to temperature of 80-100 °C and remaining 2/3 of volume of hot oil is pumped. Remaining 2 m³ of hot oil is pumped in natural cooling mode.

EFFECT: higher efficiency of cleaning well from deposits.

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