SELF-CLEANING WELL FILTER Russian patent published in 2019 - IPC E21B43/08 

FIELD: mining.

SUBSTANCE: invention relates to mining industry and can be used for equipment of oil, gas and water intake wells in the interval of productive stratum. Proposed device comprises carcass made of non-magnetic material with holes and annular permanent magnets arranged at some distance from each other, filter jacket in the form of self-contained sections with winding, cushion elements in the form of support rods and connecting elements. Filter jacket winding is formed by inner and outer layers in form of non-magnetic kapron cord of trapezoidal or wave profile. Inner layer of the winding is formed by coils located at a distance from each other. Outer layer of winding is formed by turns tightly arranged to each other, or in form of synthetic fabric mesh. Connecting elements are made in the form of upper and lower subs. Upper sub is made as left-right, in lower part of filter there is settler connected to lower adapter and flushing valve. Filter is equipped with a bearing nonmagnetic core located inside and coaxial to the perforated frame. Annular permanent magnets are arranged on carrying nonmagnetic rod, between which spacers from nonmagnetic material are located.

EFFECT: higher quality of filtration, preventing clogging of filter elements.

1 cl, 1 dwg