HYDRO-DYNAMIC FILTER Russian patent published in 2010 - IPC E21B43/08 

FIELD: oil and gas production.

SUBSTANCE: hydro-dynamic filter consists of filter element of tubular shape with filtering external surface, and of external, intermediate and internal tubes concentrically arranged. The filter element corresponds to a cylinder coil out of high-precision triangle profile welded on support elements forming a rigid shield with circular slits. Allowances of slits are within the range up to ±15 mcm. In the zone of filter element installation the external tube is perforated with uniformly spaced orifices, also on its lower end there is screwed a plug of streamline shape. Ports above the filter element on the external tube are made in the intermediate tube; the lower end of the intermediate tube is plugged; the plug corresponds to a container-accumulator gathering mechanical impurities. A lower end of the internal tube is positioned below ports of the intermediate tube.

EFFECT: raised efficiency of purification of extracted products from mechanic impurities.

6 cl, 2 dwg