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. Downhole filter comprising nipples, a coupling and a filter element with stringers laid parallel to the axis of the downhole filter between the limiting rings, and turns of the profiled wire wound on them, an inner pipe installed inside the filter element, external cylinder with radial holes and stringers, made integral with external cylinder, made with preliminary axial tension due to connection of inner pipe and external cylinder through two crosses: lower and upper, installed inside limiting rings. Connection with lower cross is made rigid, with upper – with possibility of mutual axial movement and to it is connected vibrator with BRS union (quick-release self-locking connection).

EFFECT: increased bending strength, efficient cleaning.

8 cl, 23 dwg