WELL SUCKER-ROD PUMP WITH VERTICAL SPRING PRESSURE OSCILLATION COMPENSATOR Russian patent published in 2021 - IPC E21B43/00 F04B47/02 F04B49/08 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to production of oil, in particular, to installations of borehole sucker-rod pumps. Disclosed is a downhole sucker-rod pump unit comprising a pump, pump string and a string, a vertical spring compensator mounted on the injection line by means of an outlet and a flange connection. At that, the spring compensator includes a housing with a cast piston located inside, the inner surface of which is made in the form of two hemispheres, having two holes located at an angle to the liquid flow, with perpendicular location of axes and intersection in center of piston reciprocating under action of liquid, and working section including bushings and three compression springs with vertical arrangement for uniform distribution of longitudinal load.

EFFECT: technical result consists in providing a high degree of alignment of non-uniformity of supply of well sucker-rod pump unit in wide ranges by selecting parameters and series connection of springs without using gas compression work of specified volume, in increase of working elements durability.

1 cl, 2 dwg