WELL PUMPING SCREEN Russian patent published in 2007 - IPC E21B43/08 

FIELD: oil production, particularly filters for oil cleaning of mechanical impurities to be used during oil and gas production from wells characterized by sand withdrawal from reservoir.

SUBSTANCE: pumping screen comprises perforated pipe and filtering mesh wire enclosing outer surface of perforated pipe. The pumping screen includes two main parts, namely filtering and connection ones. The filtering and connection parts are secured one to another through clutch. Filtering part is made as perforated pipe with slot-like orifices having widths equal to 0.04-0.05 of inner pipe diameter and lengths equal to 1.5-2.0 inner pipe diameters. Connection part is made as perforated pipe with perforations having diameters equal to 0.2-0.22 of outer pipe diameter and summary perforation area equal to 20-30% of total connection part area. Bush is welded to connection part pipe body. The bush is provided with threaded connection to receive rubber sealing rings having diameters 3-5 mm greater than inner well diameter and with gaskets pressed with annular screw-nuts and fixed with lock-nut.

EFFECT: increased efficiency of produced oil cleaning of mechanical impurities.

3 cl, 1 dwg