METHOD OF DRIVE AND DEVICE OF WELL HYDRAULIC PISTON PUMP UNIT Russian patent published in 2018 - IPC F04B47/04 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil industry, and namely to methods and devices for oil production. Method consists in the fact that the working fluid is supplied from the surface by the power unit to the blast down hole pumping assembly consisting of the hydraulic motor with one cylinder and of the power piston, rigidly connected by means of draft with the piston of the double action piston rod through two metal tubes of small diameter. Tubes are attached outside the tubing with clamps and protectors. Pump unit includes the hydraulic motor consisting of the cylinder divided with the piston into two cavities - the super piston and the sub-piston ones, where the working fluid is injected alternately from the surface by the power unit along two metal hydraulic tubes through the distribution device, which is also located on the surface. Hydraulic oil can be used as a working fluid. Piston of the hydraulic motor, reciprocating up and down rigidly, is connected to the piston of the double action piston pump, which is also divided by the piston into two cavities and has two valves in each cavity: injection and suction ones, for simultaneous suction and injection of formation fluid into each cycle of piston moving down/up.

EFFECT: operating costs for lifting the well fluid are reduced.

3 cl, 2 dwg