FIELD: oil and gas industry.
SUBSTANCE: invention relates to oil production and can be used for pumping oil by submersible centrifugal pumping units with frequency-controlled electric drive from multilayer wells, especially in presence of marginal oil-bearing horizons in them. Method consists in short-term pumping oil from one and more oil-bearing horizons of the well simultaneously with its accumulation on other horizons of multi-well well separated with packers, and alternation of short-term oil pumping from oil-bearing horizons by periodic switching of their opening to closing and vice versa with electric drives as oil accumulates in well at continuous operation of frequency-controlled electric drive with capacity control in accordance with flow rate of oil-bearing horizons and pressure in well, determined by sensors of control-measuring instruments. Duration of short-term pumping of accumulated oil from one horizons is integrated with duration of oil accumulation on other oil-bearing horizons, which is not more than 0.95 of duration of short-term pumping, to pressure determining volume of accumulated oil, which exceeds minimum level of filling of flow column, by changing rotation frequency of electric pump drive to efficiency of not less than 0.9 of its maximum value.
EFFECT: increased efficiency and reliability of operation of multi-zone wells, especially with marginal oil-bearing horizons.
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