SLOTTED BOREHOLE FILTER Russian patent published in 2017 - IPC E21B43/08 

FIELD: oil and gas industry.

SUBSTANCE: device comprises a perforated supporting pipe and at least one slotted filter unit made of a wire which is spirally coiled around longitudinal elements. Inside the supproting pipe there is a casing installed with an annular gap, within which there is a device with an annular gap for swirling the produced product. Slotted filter units are attached to the supporting pipe by welding one retaining ring.

EFFECT: increased abrasion resistance, provision of the desired level of filtration and flow rates for a long period of time, increased stiffness and strength, provision for self-cleaning.

12 cl, 18 dwg