OIL-WELL SUCKER-ROD PUMPING UNIT Russian patent published in 2017 - IPC F04B47/02 

FIELD: oil and gas industry.

SUBSTANCE: unit comprises two balanced lifting liquid lines of different weights, including the corresponding suspension, connected to a reversible drive body by a flexible element, polished rods, rod strings and pumps placed in the appropriate pipe strings isolated from each other, lowered into the well. Reversible driving body is connected to the actuator for rotation and reciprocation together with the traction body. The reversible driving body is equipped with a drum having flexible rod, adapted to be wound around the drum. The other end of the flexible rod is fixed at a different level within the height of the actuator at the mounting mechanism, which is adapted for fixation relative to the wellhead. The drum is connected to the axle via an adjustable mechanical gear to increase or decrease the stroke of the liquid lifting lines relative to the actuator stroke.

EFFECT: expanded mounting possibilities and reduced power consumption of the installation, easy installation is excluded when one of the lift lines failures, increased operational reliability.

4 cl, 6 dwg