WELL FILTER Russian patent published in 2011 - IPC E21B43/08 

FIELD: oil and gas production.

SUBSTANCE: well filter corresponds to filter block consisting of two concentric pipes, of filter element, of plugged impurities accumulator and of valve. At its lower an external pipe has an adapting support coupling, into a through thread orifice of which there is installed the impurities accumulator. Tangentially arranged input slit orifices are made in the external pipe. A coupling-adaptor is installed on an upper end of the external pipe into the threaded orifice. Also, a wire screen is installed into a circular gap between the internal and external pipes; the screen is secured on a lower part of the external pipe by means of uniformly arranged pins positioned on both sides of the wire at different vertical level so, that the low end of the wire screen is located below a valve.

EFFECT: raised reliability of filter operation; reduced prime cost of repair and preventing works for replacement and restoration of filter.

6 cl, 7 dwg