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. Proposed unit comprises power drive with traction element, reversible drive element connected with power drive with possibility of rotation and reciprocation together with traction element and equipped with drum with flexible tie, made with possibility of winding with successive increase or reduction of winding diameter on drum at rotation of reversible drive member to ensure respectively increase or decrease of liquid lifting lines relative to stroke of power drive, with the other end of the flexible rod fixed on the mechanism of attachment, which is made with possibility of fixation relative to the well mouth. Two equalized fluid lifting lines include appropriate suspensions connected to the reversible drive element by means of a flexible element. Polished rods, rod strings and pumps are arranged in corresponding tubular strings, which are isolated from each other, and lowered into the well. Reversible drive member is equipped with at least one additional drum with additional flexible rod, made with possibility of winding with successive reduction or increase of winding diameter on additional drum at rotation of reverse drive element at corresponding increase and reducing diameter of winding of flexible rod on drum and attachment of additional flexible rod at different level within height of power drive on attachment mechanism in opposite end from flexible link. Reversible drive element is equipped with upper and lower beams connected to each other with possibility of rotation in horizontal and vertical planes. Bottom beam is connected with traction element, and upper beam is connected with reversible drive element.

EFFECT: higher reliability of operation.

1 cl, 9 dwg