SLIT-TYPE FILTER Russian patent published in 2019 - IPC E21B43/08 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry and can be used for protection of well pump installations during oil production in conditions complicated by high content of mechanical impurities in formation fluid. Proposed device comprises pipe with filtration section with holes perforations and slots for moving said two-sided thrust. Around the pipe there is a filter element concentrically installed, which is made in the form of a wire wound along a spiral, between the coils of which there formed are slots. Size of slits is adjusted by means of spring, which force exceeds elastic deformation of filtering element wire. Upper and lower stationary stops are mounted on pipe ends, and stiffening ribs are installed on outer surface of filter section. Filter is additionally equipped with elastic element with through holes, channels or cavities, which is fixed on movable double-sided support. Filter element is arranged between movable double-sided and upper fixed stops with rigid end of wire turns. Spring is located between double-sided and lower fixed stops.

EFFECT: higher convenience of maintenance and efficiency of slit-type filter operation in the well due to reduced time for its cleaning and, consequently, increased operating time of the downhole pump unit for failure.

4 cl, 5 dwg