DOWNHOLE SUCKER-ROD PUMP OF DOUBLE ACTION Russian patent published in 2024 - IPC F04B47/00 F04B53/10 

FIELD: pumps.

SUBSTANCE: invention relates to pumping equipment and can be used in oil production industry as part of downhole pumping equipment. Downhole sucker-rod pump of double action includes a sub, upper and lower pressure valves with seats, a hollow plunger arranged in a cylinder with possibility of back-and-forth movement. Below the cylinder there is an additional cylinder with a mandrel and a hollow plunger connected to the cylinder by means of couplings and a branch pipe with inlet channels or a filter. Lower end of the additional cylinder is blind. Hollow plungers are installed on mandrels with possibility of longitudinal mobility relative to mandrels, limited at its one end by a stop, and at the opposite end by a wear-resistant seat. Mandrel of upper pressure valve is installed so that wear-resistant seat is arranged in its lower part. Mandrel of lower pressure valve in additional cylinder is installed so that wear-resistant seat is located in its upper part, and is rigidly connected to mandrel of lower pressure valve by rod, length of which is equal to length of pump stroke. Mandrel of the upper pressure valve is rigidly connected to the pump rod, the length of which is equal to the sum of the lengths of the pump stroke and the pump rod seal housing. Above the pump rod seal housing there is a sub with the inlet of the bypass channel connecting the lower end of the additional cylinder with the cavity of the pump string. Lower end of the bypass channel is equipped with a ball valve. Pressure valves are used for forced actuation.

EFFECT: invention is aimed at creation of relatively simple, reliable pump with high efficiency and improvement of energy efficiency of downhole pumping equipment.

2 cl, 4 dwg