HYDRAULIC DRIVE UNIT OF HYDRAULIC PUMPING UNIT AND CORRESPONDING HYDRAULIC PUMPING UNIT Russian patent published in 2018 - IPC F04B47/04 F15B11/16 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the field of oil producing equipment, in particular to the hydraulic drive unit of a hydraulic pumping unit. Hydraulic drive unit (100) of the hydraulic pumping unit comprises engine (1), power body (5) for bringing the pump rod into reciprocating motion, adjustable pump (2) driven by engine (1) and hydraulically connected to power body (5), secondary hydraulic control unit (3), hydraulically connected to power body (5). Energy accumulator (4) is mechanically connected to secondary hydraulic control unit (3). Contains sensor (6) for setting the stroke length of the pump rod, first control device (7) adapted to adjust the output of adjustable pump (2) to zero based on the signals from sensor (6) while lowering the pump rod, and when lifting the pump rod – to a positive value for the activation of power body (5). Second control device (8) is adapted to operate secondary hydraulic control unit (3) in the engine mode to drive battery (4) based on signals from sensor (6). Purpose is to store energy, and when lifting the pump rod – to ensure the operation of secondary hydraulic unit (3) in the mode of the pump driven by battery (4) of the energy to drive power unit (5). Corresponding hydraulic pumping unit is also disclosed.

EFFECT: hydraulic pumping unit has a high energy recovery efficiency and is simple and reliable.

11 cl, 2 dwg