FIELD: oil production; applicable in limitation of water inflow to cased well and also in separation of oil, gas and water in field treatment. SUBSTANCE: in operation of oil wells, permanent magnetic field, extended in length, is set up in the interval of water inflow. For this purpose, connected to intake of downhole pump is dielectric spacer and gas anchor. Permanent magnetic field is set up in annular space between body of gas anchor and casing string. Operation is effected, in this case, at bottom hole pressure below the pressure of gas saturation of fluid. EFFECT: provision on well bottom of conditions for efficient inside-well separation of oil, gas and water, with subsequent lifting of oil and gas phases only. 3 cl, 1 dwg
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