SUCKER ROD PISTON PUMP Russian patent published in 2018 - IPC F04B47/00 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the field of operation of an oil well by the artificial lift production method, in particular to sucker rod piston pumps for the production of oil with a high content of mechanical impurities, sand and viscous oil from the well. Pump includes a cylinder with a hollow plunger lowered on the tubing string, a suction and discharge valve. Pump cylinder is installed between the pipes of tubing and connected to them by adapters – upper and lower. Pump is additionally equipped with two piston pairs – upper and lower. Upper piston pair is mounted inside the plunger connected to its cylinder at the bottom on the thread so that they are at different levels in height and length. Piston is provided with a cover with a connecting member with a rod and an outer annular protrusion at the lower end, with which the cylinder is engaged when the piston moves upward. In the wall of the piston and its cylinder, windows are made at different levels in height in the longitudinal direction with the same geometric dimensions, which are combined when the piston is in the lowest position, forming a discharge valve. Lower piston pair is installed in the lower part of the pump cylinder with similarly formed windows in the wall of the piston and its cylinder forming the suction valve when aligned, when the piston of this pair is in the upper position. Upper end of the piston cylinder of the lower piston pair is stepped and threaded to the lower adapter. Piston is plugged from below and spring-loaded. For engagement with the end of the upper piston with a ring protrusion, piston is provided with an annular permanent magnet mounted on its upper end abutting on the protrusion of the cylinder on which a washer made of dielectric material is mounted to reduce the effect of the magnet on it.

EFFECT: pump has high operational reliability and performance, allows to increase the inter-repair period of the well.

1 cl, 4 dwg