METHOD FOR PRODUCTION WELL BOTTOM ZONE TREATMENT BY OUTFLOW Russian patent published in 2006 - IPC E21B43/18 E21B37/00 

FIELD: oil production industry, particularly enhanced recovery methods for obtaining hydrocarbons.

SUBSTANCE: method involves selecting well characterized by reduced intake capacity for following well treatment so that total outflow time is to be not more than 5 hours; bringing the selected well into operation for not less than 10 days along with liquid injection via the well; providing maximal conditional passage of well fittings; stopping liquid injection in well; discharging liquid from well to reach necessary calculated liquid volume at maximal flow rate; injecting liquid through the well at flow rate equal to 3 initial well intake capacity values up to pressure stabilization; injecting liquid in well at increased flow rate equal to 4 initial well intake capacity values; performing flow rate increase in several stages under stabilized injection pressure, wherein each flow rate increase step is equal to initial well intake capacity value, up to full control valve opening; discharging liquid from well at maximal flow rate so that discharged liquid volume is equal to calculated one; repeating liquid injection and discharge operations 3 times, wherein the last liquid discharge operation is carried out at maximal flow rate and in amount equal to the volume of the first liquid discharge.

EFFECT: increased well cleaning efficiency.

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