The article deals with theoretical and practical issues of improving the efficiency of operation
of high-water cut oil wells by developing and applying double-acting pumping systems
based on electric submersible pumps. This combination is providing down-hole gravitational
separation of oil and produced water, lifting low-water-cut oil to the surface with
simultaneous injection of most of the separated water into the absorbing formation without
lifting to the surface. Moreover, it is providing low-cost regulation of the ratio of the volumes …