WELL BOTTOM-HOLE PUMP DRIVE Russian patent published in 2014 - IPC F04B47/02 

FIELD: oil and gas industry.

SUBSTANCE: well bottom-hole pump drive comprises an asynchronous motor 1, a double-acting reducing gear 3 and a drum 5 for a rope 6 winding, which are interconnected by couplings 2 and 4. The rope 6 is fixed by its one end at the drum 5 while by its second end it is connected to a rod 8 of the bottom-hole pump. A brake magnet 9 interacts with the asynchronous motor 1. A programmable electronic control unit 13 controls the drive by a frequency converter 12. The unit 13 takes readings of sensors 10, 11 and controls the operation mode of the drive as well as operation of the drive and brake 9. The string is retained in its upper position during a short period of time by an electrical balancing system consisting of: electronic control unit 13, electromagnet brake 9 and frequency converter 12.

EFFECT: improved reliability and efficiency of electric energy use at the simultaneous reduction of a specific quantity of metal and weight of the drive.

7 cl, 1 dwg