HYDRAULIC DRIVE OF SUCKER-ROD WELL PUMP Russian patent published in 2009 - IPC F04B47/08 

FIELD: motors and pumps.

SUBSTANCE: invention is related to equipment for oil production from deep wells. Hydraulic drive comprises the following components fixed on foundation: balancing cylinder with hollow piston connected to system of pressure maintenance, hydraulically driven cylinder with piston installed in balancing cylinder and jacket covering hydraulically driven cylinder. Piston of hydraulically driven cylinder is installed on stem withdrawn from hydraulically driven cylinder and connecting it to hollow piston of balancing cylinder and pump rods. Power pump is connected to distributor of working fluid flow to hydraulically driven cylinder. Balancing cylinder with hollow piston and hydraulically driven cylinder with piston installed in it and covered with jacket are fixed on foundation. Piston of hydraulically driven cylinder is installed on stem withdrawn from hydraulically driven cylinder and connecting it to hollow piston of balancing cylinder and pump rods. Hydraulic accumulator is connected to cavity of balancing cylinder. Working fluid is hydraulically driven cylinder is pressurised with pressure that exceeds pressure in balancing cylinder by value that is not less than the value of maximum and minimum pressures difference in it.

EFFECT: increase of pressure maintenance system hydraulic drive operation reliability.

3 cl, 1 dwg