FINE WELL FILTER Russian patent published in 2018 - IPC E21B43/08 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil industry and can be used in the operation of oil, gas, water wells when pumping out fluid media with mechanical impurities. Device includes a filter element – a metal tube with holes in the form of sections, connected together by centralizers, in the upper part of which a coupling with a valve element is installed. Metal tube with holes on the outer surface is divided by partitions, between which spring-loaded scrapers are placed, the housing of each of which is pressed with dies at the ends against the casing, and the sharpened surface of the scraper is pressed against the surface of the metal tube. Scraper housings are radially connected to each other by means of a metal rod. Centralizers have skates of triangular cross-section and a barrel shaped profile. Before running into the well, springs of the scrapers are compressed and glued with glue that is destructed after a given time interval, and the diameter of the glued scrapers is smaller than the diameter of the centralizers. After the destruction of the glue, the outer diameter of the scraper housings with dies is larger than the diameter of the centralizers.

EFFECT: increase in reliability of the device, increase in overhaul period of the rod well pump due to the elimination of the possibility of clogging the filter element.

1 cl, 2 dwg