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

FIELD: facilities for fluid lifting from wells.

SUBSTANCE: invention relates to equipment for fluid lifting from wells and can be used in oil producing industry for oil production by well sucker rod pumps. Well sucker-rod 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 including appropriate suspensions, polished rods, rod strings and pumps arranged in corresponding tubing strings isolated from each other and lowered into the well. Reversible driving element is made in the form of a rotating part of the transfer converting reciprocating movement of the reversible driving element into its rotation, including, except rotating, and moving parts which are connected to suspensions of lines of lifting of liquid. One of movable parts is equipped with braking mechanism fixed relative to well head. Moving parts of transfer have the possibility of limited movement along their axes.

EFFECT: enlarging application possibilities of well sucker-rod pump unit on a greater number of wells, simplifying control of speed of pumping-out of lines of liquid lifting, improving reliability of operation, excluding accidents during operation of the plant, and also increasing efficiency of installation.

1 cl, 5 dwg