HYDRAULIC DRIVE OF SUCKER-ROD PUMP Russian patent published in 2024 - IPC F04B47/04 

FIELD: oil industry.

SUBSTANCE: invention relates to the oil industry, in particular to hydraulic drive devices for lifting liquids from large depths with sucker-rod pumps. Hydraulic drive of well sucker-rod pump includes hydraulic cylinder 1 with plunger 2 installed with formation of sub-plunger and above-plunger cavities 3 and 4, lifting column 5, in which there is hydraulic cylinder 1, reservoir 6 with working fluid, pump 7 for supplying working fluid from reservoir 6 via pressure-force line 8 under excess pressure through channel 9 into cavity 3 for lifting plunger 2, annular gap 10 formed between hydraulic cylinder 1 and column 5 and configured to lift well product from sucker-rod pump 11. Channel 9 is configured to displace working fluid from cavity 3 when plunger 2 moves downwards under the weight of rods 12 and plunger 13 of pump 11. Cavity 4 is interconnected with reservoir 6 by drain line 14. Lines 8 and 14 are connected by bridge 15 equipped with controlled gate valve 16 made with possibility of opening when plunger 2 moves upwards and closes when plunger 2 moves downwards. Channel 9 is located outside hydraulic cylinder 1, with which at least one side hole 17 is connected from below. Pump 7 is configured to stop when plunger 2 reaches upper dead point and start when plunger 2 reaches lower dead point.

EFFECT: invention is aimed at expansion of functional capabilities and improvement of reliability.

1 cl, 1 dwg