FIELD: oil industry.
SUBSTANCE: invention relates to the oil industry, it is designed for the use on low-yield wells operated by electric centrifugal pumps (ECP) in a periodic mode. An elevator pipe column for a downhole electric centrifugal pump contains pump-compressor pipes from the pump to the wellhead and several check valves above the pump. Several check valves are installed evenly and with a greater frequency in the section from the pump to the depth Npump with a pressure, equal to the pressure of oil saturation with gas, than in the section of the pipe column from the depth Npump to the wellhead.
EFFECT: increased efficiency of the electric centrifugal pump operating in a periodic mode.
1 cl, 1 dwg
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