FIELD: designs of devices for transfer both separate fractions and whole complexes of hydrocarbons withdrawn from oil wells. SUBSTANCE: device has system of pipelines, reagent introduction unit, gas dispenser, double-diameter cylinder accommodating differential plunger. Constant pressure additional chamber has three pressure branch pipes provided with valves regulating fluid flow rate, and stuffing box rod connected with movable cylinder. EFFECT: higher efficiency of field system of gathering, treatment and transportation of hydrocarbons, reduced power consumption and material expenditures. 1 dwg
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