DOWNHOLE FILTER Russian patent published in 2020 - IPC E21B43/08 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, specifically to means of oil and gas filtration. Device contains nipples, a coupling and at least one filtering unit containing a filter element with stringers laid parallel to the well filter axis between the limiting rings, and coils of the profiled wire wound on them. Each filtering unit comprises inner pipe with lengthwise ribs, external cylinder with radial holes and stringers arranged coaxially without clearance and provided with outer cylinder. Connection of internal pipe and external cylinder is made through two cross-pieces installed inside limiting rings.

EFFECT: higher bending strength while maintaining torsional strength, efficient cleaning.

13 cl, 28 dwg