FIELD: oil production. SUBSTANCE: plant has tubing with cylinder lowered into well. Cylinder accommodates piston connected by means of rod with pumping unit. Piston has check valve and ports. Lower end of cylinder is closed with movable plug. When plunger moves upwards, zone of decreased pressure is formed in cylinder hollow and fluid is drawn thereto through ports after their coming out of cylinder. Fluid flow strikes plug bottom. Plug is made in form of sleeve. Pulse from fluid strike is transmitted through fluid in well to producing formation. EFFECT: reduced losses of energy in transmitting pulses to well. 2 cl, 1 dwg
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