BOREHOLE FILTER Russian patent published in 2005 - IPC

FIELD: mining industry, particularly equipment for water intake, oil and gas wells arranged within the interval of production bed made up of soft rock.

SUBSTANCE: borehole filter includes perforated body, filtering jacket made of independent sections with wire winding, packing members and end sleeves connected to perforated body. Filtering jacket is formed of easy-drillable material, for instance of polyethylene or propylene. End sleeves are connected with perforated body by means of shear pin. Packing members of filtering jacket are made as perforated tubes connected to end sleeves. Perforated body has solid outer surface and provided with blind tube having double connection coupling including outer member having tool-joint thread hand orienting in the same direction as that of perforated base, and inner member having opposite tool-joint thread hand.

EFFECT: improved maintainability and increased efficiency of well repair.

3 cl, 1 dwg