HYDRODYNAMIC FLUSHING FILTER Russian patent published in 2010 - IPC E21B43/08 

FIELD: process engineering.

SUBSTANCE: invention relates to mining, particularly to oil-and-gas production, and can be used in development of oil and gas wells. Proposed filter comprises filtration unit representing two connected tubes, several filtration elements, valve and plug. Different-diametre tube are arranged coaxially. Larger-diametre tube lower end face accommodates cover with central bore to receive smaller-diametre tube. Plug is fitted on smaller-diametre tube lower end and represents container-collector of mechanical impurities. Valve is arranged in end face cover fitted on smaller-diametre tube top end. Smaller-diametre tube top section sidewalls are furnished with shut-off valves, said section being fitted inside larger-diametre tube.

EFFECT: higher efficiency of filtration.

9 cl, 9 dwg