WELL FILTER OF IMPROVED PERMEABILITY Russian patent published in 2016 - IPC E21B43/08 

FIELD: water supply.

SUBSTANCE: invention relates to water supply and drainage for equipment of water intake part of wells in aggressive and corrosive media. Slot-type filters with winding of shaped wire are installed in sand-gravel aquifers with circuit of gravel packing and without it, and filters of composite plastic rings or plates under a circuit of gravel packing. Filter includes support bars, winding shaped wire or package ring, or plate of plastic forming horizontal slot. On external surface of shaped wire winding, or composite rings or plates made of plastic has horizontal hemispherical grooves parallel to main horizontal slots having same width and connected to them inclined at an angle of 45° semi-spherical recesses of same width for passage of filtered water from additional recesses inside filter.

EFFECT: higher porosity, service life, reduced power consumption for lifting water.

1 cl, 2 dwg