DOWNHOLE SUCKER-ROD PUMP UNIT DRIVE Russian patent published in 2012 - IPC F04B47/02 

FIELD: oil-and-gas production.

SUBSTANCE: proposed drive comprises motor 5 engaged directly or via reduction gear 6 with differential mechanism 7. Additionally, said drive comprises, at least, one differential mechanism. Each differential mechanism 7 has, at least, output shaft 9 and housing 14 rigidly coupled with crown wheel 11. Output shaft 9 and differential mechanism housing 14 are engaged with cranks 9,12 and con rods 13. Reduction gear 6 and two differential mechanisms 7 may be arranged in one housing. Reduction gear 6 may be engaged with differential mechanisms 7 via chain or belt transmission 17 or propeller shaft. Reduction gear may be arranged between differential mechanisms 7 and coupled therewith via couplings 16.

EFFECT: ruled out vibration of pumping unit.

4 cl, 4 dwg