DOWNHOLE ANTI-SAND FILTER Russian patent published in 2025 - IPC E21B43/08 

FIELD: obtaining oil and gas from wells.

SUBSTANCE: invention relates to oil and gas industry and can be used in oil and gas production for well fluid filtration. Downhole anti-sand filter comprises a perforated base pipe, retaining rings at the ends of the base pipe, a filter element comprising an outer and an inner filtering layer made in the form of wire filters, between which there is a layer of gravel packing, where wire filters contain a filtering surface formed by direct winding of profiled wire with a gap between turns, and connected by spot contact welding with underlying stinger. Stingers of the inner filtering layer are fixed on the perforated base pipe, and the stingers of the outer filtering layer are fixed above the inner filtering layer. Filtering surface of the wire filters of the external and internal filtering layer is made by direct winding of the shaped wire on the corresponding stinger with interference. Stingers of external and internal filtering layers are located coaxially to each other.

EFFECT: increased reliability of the filter design, which provides the required level of filtration and its stability for a long time due to increased strength of the structure.

6 cl, 4 dwg