FIELD: jet-type equipment, applicable in oil-gas extractive industry at development, exploration and exploitation of wells. SUBSTANCE: the pump has a body with a central channel, mixing chamber, diffuser, active medium inlet ducts, passive medium inlet ducts and an annular active nozzle. The check valve is made in the form of a controlled movable bush. The movable bush is located in the in the pump central channel at the level of the nozzle, diffuser and passive medium inlets. The bush through a rod is connected to a piston positioned in the cavity for the feed of active medium. The pump is lowered in the well complete with a packer. Active medium acts on the piston. The rod moves the bush. The ducts for the feed of passive medium from the well get open. As soon as the feed of active medium is over, the bush returns to the initial position. EFFECT: expanded functional abilities, enhanced reliability. 3 dwg
