WELL ROD PUMPING UNIT Russian patent published in 2016 - IPC F04B47/02 

FIELD: oil industry.

SUBSTANCE: invention relates to devices for fluid lifting from wells and can be used for oil production. Apparatus comprises power drive with traction element, a reversible drive element, two balancing fluid lifting lines of different weight, including corresponding suspensions, connected with reversible drive element by means of a flexible element, polished rods, rod strings and pumps arranged in isolated pipe strings. Reversible drive element is connected with power drive with possibility of rotation and reciprocation, together with traction element. Reversible drive element is equipped with a drum with flexible link,configured for winding on drum during rotation of reversible drive element. Other end of flexible link is fixed at different level within height of power drive on retention mechanism, which may be locked relative to well head. Reduced consumption of electric power by plant, due to possibility of separately matching pumping speed of each lifting line with rate of influx of formation. Simple installation during failure of one of lifting lines is prevented.

EFFECT: higher reliability of operation.

4 cl, 5 dwg