DOWNHOLE BRUSH FILTER (VERSIONS) Russian patent published in 2016 - IPC E21B43/08 

FIELD: treatment plants.

SUBSTANCE: invention relates to filtration devices arranged in the interval of perforations of the well production string to prevent removal of rock particles from the formation bottomhole zone. Device comprises a bearing perforated tube and a brush placed on it, which bristles outer diameter is not less than the inner diameter of the production string. Housing of the brush is formed with closed turns of a U-shaped flute of a spiral strip brush, and the function of radial channels is performed by grooves on side walls of the U-shaped flute or holes in its wall.

EFFECT: provided are maintaining efficiency of the well, longer period between its repairs, decreased wear and increased lifetime of the submersible pump equipment, reduced labor input of the filter.

4 cl, 8 dwg