ARRANGEMENT OF WELL STRAINERS FOR DECREASING FLOODING OF OIL WELLS Russian patent published in 2010 - IPC E21B43/12 E21B43/08 

FIELD: oil and gas industry.

SUBSTANCE: arrangement of well strainers for decreasing flooding of oil wells includes well strainers installed in lower part of pipe string in the area of productive formation. Strainers consist of perforated tubes and filtering elements. A flow string passes inside pipe string with strainers, and in lower part of which there installed is a bore-hole pump to the location area of which the area of perforation holes throughout the length of the well decreases and then increases. At that, there can be no perforation in location area of bore-hole pump. At that, all perforated tubes of strainers have marking for proper installation.

EFFECT: decreasing flooding of wells, prolonging the time of their operation, increasing oil production volumes, and decreasing its production cost.

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