BOTTOM-HOLE SUCKER-ROD PUMP Russian patent published in 2019 - IPC F04B47/00 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to production of oil, in particular, to bottom-hole sucker-rod pumps, and can be used in oil industry. Pump comprises cylinder with plunger and suction and discharge valves, in lower part of which there is a container with process liquid, equipped with channel for passage of process liquid into annular cavity with check valve, as well as holes on the cylinder for supply of process liquid from the casing into the plunger pair gap. Container is equipped with separating spring-loaded piston and check valve in lower part. Hole is made on the cylinder for the well fluid to enter the pump. Outer surface of the cylinder has grooves the cross-section of which has the shape of a right-angled triangle, forming an acute angle with the axis of the plunger towards the suction line of the pump. Upper and lower ends of the plunger have a cylindrical shape. In the interval between them there are grooves. Channel of process liquid passage into annular cavity formed by casing and outer surface of cylinder is chamber with check valve at inlet and holes for supply of process fluid into annular cavity. Channel at the intake of the pump under the suction valve is made in the form of a tube installed across the pump axis and crossing through the receiving chamber and casing. On the tube there are perforated holes in the zone limited by the inner diameter of the cylinder. Filters are installed on tube ends.

EFFECT: longer service life of the plunger by lubrication of the gap in the plunger pair with simultaneous reduction of leaks in the plunger pair.

1 cl, 4 dwg