FIELD: oil and gas production.
SUBSTANCE: pump extracts oil from lower reservoir through hollow rod string and from upper reservoir via production string. The pump unit consists of two successive plunger pairs of various diametre. Efficiency of the pump unit for a lower reservoir is determined with area of cross section of the lower reservoir, while for an upper reservoir efficiency is determined by difference of cross section of the upper and lower plungers. A side suction valve is used for reception of fluid of the upper reservoir.
EFFECT: simplified design and increased reliability of its operation.
1 dwg
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