BIDIRECTIONAL OIL WELL PUMP Russian patent published in 2015 - IPC E21B34/06 F04B47/04 

FIELD: oil and gas industry.

SUBSTANCE: bidirectional oil well pump includes a cylinder and plunger with suction and injection channels and stop valves run in at the pipe string, at that the upper suction valve is installed outside the cylinder and the plunger is connected to stem through a hollow rod with sealing. The lower suction valve of the cylinder is placed outside, the plunger from the top and bottom is equipped with the upper and lower pressure valves respectively. Through top openings the hollow rod is interconnected to the pipe string space and through the upper and lower pressure valve of the plunger it is connected to the respective cavities of the cylinder; cavities of the cylinder and pipe string space are disengaged by sealing of the hollow rod. Each valve is made as a case with inner circular channel interconnecting inlet radial ports with inner circular groove, stop valve made as an elastic cylindrical bushing with outside thickening covering circular groove so that its can be passed inwards and fixed at the case behind thickening with a lock from outside. From outside inlet ports of the suction valves are equipped with filters and above the cylinder the pipe string is equipped with a drain valve.

EFFECT: higher pumping capacity.

3 cl, 2 dwg