CARTRIDGE-TYPE DOWNHOLE FILTER Russian patent published in 2020 - IPC E21B43/08 E03B3/18 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry and can be used in oil and gas production. Filter is multilayer, tubular and comprises external protective casing with perforated holes and inner casing with at least one filtering layer arranged between them. Tubular external protective casing is equipped with extracts concave inside casing. Filter is made in the form of a cartridge equipped with closing fixing rings, from the internal side of which an external protective casing and an inner casing are permanently fixed. Perforation holes of external protective casing are made by cutting and drawing of casing sheet inside with support of extracts on external surface of filtering layer and formation of at least filtering gaps between external protective casing and filtering layer. Inner casing is additionally equipped with concave inside of spherical deepenings of equal depth, distributed along inner surface of casing, with formation along internal surface of casing of point supports for installation on base pipe and provision of internal drainage.

EFFECT: higher quality of filtration of solid admixture, improved throughput capacity of filter due to reduction of hydraulic resistance, increased erosion resistance and mechanical strength of filter design.

16 cl, 9 dwg