FIELD: oil and gas extractive industry.
SUBSTANCE: device has differential bar pump lowered on tubing column, and packer on tail piece. Tail piece is placed in area of oil-water contact of watered oil bed below pump. Body of differential bar pump consists of two stepped cylinders and one doubled hollow plunger with suck-in and force valves, forming two separate chambers and having separate hydraulic channels. These channels connect differential bar pump to above-packer and below-packer areas of watered oil bed of well. Relation of extracted volumes of, respectively, oil and water from these areas, is determined by analytical expression.
EFFECT: higher effectiveness.
2 cl, 1 dwg
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