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

FIELD: oil and gas industry.

SUBSTANCE: invention relates to equipment for fluid lifting from wells and can be used in oil producing industry for oil production. Plant comprises power drive with traction element, reversible drive element connected with power drive with possibility of rotation and reciprocating movement together with traction member, two balanced lines of lifting of liquid of different weight, including corresponding suspensions, connected with reversible drive element by means of flexible element, polished rods, rod-like columns and pumps arranged in appropriate isolated columns of pipes, controlled mechanical transmission. Reversible drive member is equipped with gearing including moving and fixed parts converting reciprocating motion of reversible drive member into its rotation. Fixed part of transmission is fixed relative to well mouth. Movable part of gear is connected via controlled mechanical transmission with reversible driving element.

EFFECT: enlarging possibilities of application of well rod pump unit on a large number of wells due to exclusion of use of difference of weights of lifting lines, improving operating reliability and excluding accidents during plant operation.

1 cl, 3 dwg