WELL SCREEN Russian patent published in 2008 - IPC E21B43/08 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil and gas industry. A well screen includes a pipe with spiral rows of apertures made on its side surface. Cut off hollow plugs are pressurized into the apertures. At least one layer of support-drain strainer, three layers of filter strainers and an exterior perforated protective case are assembled concentric to the pipe. The filter strain with small cells is installed between two layers with bigger cells. The screen is additionally equipped with an overlapping tape made out of stainless steel. The width of the tape is equal to double diameter of pipe apertures, and the thickness is equal to 0.1-1.0 mm. The tape is arranged on the pipe between the exterior perforated protective case and the filter strain with bigger cells above the apertures on the same spiral as the apertures on the side surface of the pipe.

EFFECT: upgrading of filter characteristics at low hydraulic resistance.

6 cl, 1 dwg