FIELD: oil production. SUBSTANCE: piston is secured to a cable and made of a set of identical sections interconnected through a tube. Return valve is controllable. The device is provided with a push member made in the form of hollow tube of the material of density equal to the density of well liquid, and a weight. The sections have pockets. Each section is individual piston to provide concurrent depression by several pistons in the course of cyclic operation of the controllable valve when the device comes up from the well. Mechanical particles carried over from the seam are caught by the pockets in ascending the device. EFFECT: higher productivity. 2 cl
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