DOWNHOLE SUCKER-ROD PUMPING UNIT Russian patent published in 2020 - IPC F04B47/02 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to devices for fluid lifting from wells and can be used in oil producing industry for oil production. Pump unit comprises a power drive with a traction member, a reversible drive member connected to the power drive with possibility of rotation and reciprocating movement together with the traction member, two balancing fluid lifting lines, polished rods, rod strings and pumps arranged in corresponding pipe strings isolated from each other. Reversible drive element is equipped with gearing including rotating and moving parts that converts reciprocating motion of reversible drive member into its rotation. Rotating part of the gear is rigidly connected to the reversible driving element or is connected by a fixed connection transmitting torque. Movable part of the gearing is equipped with a movement mechanism and is fixed on it with the possibility of limited movement along its axis.

EFFECT: control of fluid lifting lines pumping rate is provided without installation shutdown, operation reliability is increased, accidents at operation are eliminated.

1 cl, 5 dwg