PUMPING UNIT WITH OUTPUT CONTROL Russian patent published in 2006 - IPC F04B47/02 

FIELD: oil production, particularly equipment for well operation.

SUBSTANCE: pumping unit comprises sucker rod string, supporting derrick, pulley block, guiding and deflecting pulleys, jack and winch with two asynchronous motors. The asynchronous motors are electrically linked one to another by serially coupled stator windings. The asynchronous motors are mechanically connected by common shaft of bicylindical-conical rope drum of the winch. The deflecting pulleys may be displaced. The bicylindical-conical rope drum is composed of two rotary parts, which may perform mutual rotation and rotate relative common shaft, and of two conical parts sliding along cylindrical parts.

EFFECT: increased operational efficiency due to possibility of smooth regulation of rod hanger swinging frequency and amplitude.

3 dwg