CONVENTIONAL PUMPING UNIT WITH COUNTERBALANCE AND REVERSING ENGINES Russian patent published in 2017 - IPC F04B47/02 

FIELD: engines and pumps.

SUBSTANCE: installation with a counterweight comprises two or more reversing engines, each directly and functionally connected to a rotatable drive component mounted on a supporting structure located above the wellhead equipment. For each engine, the elongated flexible drive element encompasses the rotatable drive component interacting therewith. One end of the flexible drive element is connected to the counterweight as an assembly. The other end is connected to a rod string interacting with the wellhead equipment. The actuation of the engines causes rotation of the rotatable drive components. As a result, the drive elements move the rod string and the counterweight as an assembly in opposite vertical directions. The rotation direction of the drive engines alternates to provide alternating directions for the vertical movement of the rod string and the counterweight. The counterweight assembly may be concentric with respect to the wellhead equipment or may be offset from the wellhead equipment.

EFFECT: stroke length of the piston is increased.

13 cl, 7 dwg