WELL FILTER Russian patent published in 2011 - IPC E21B43/08 E03B3/20 

FIELD: oil and gas production.

SUBSTANCE: well filter consists of pipe with orifices made on its side surface; shear plugs are inserted into said orifices. Also, well filter consists of a protective jacket with orifices and a filter net. The filter net is installed between the jacket and the pipe and is made as lengthwise, crosswise or inclined to the filter corrugations. Surfaces of corrugations adjacent to the pipe are attached to the surface of the pipe by means of point weld. A protective net with dimension of a mesh 1-5 mm is installed between the protective jacket and the filter net. Ends of the filter net are secured to the pipe by means of ferrules, while the jacket and the protective net are attached to the pipe by means of support-fit rings. A lower support-fit ring for securing the protective net and the jacket is positioned below a lower ferrule fixing the filter net, thus forming a collecting chamber for mechanical impurities.

EFFECT: increased filter surface of filter net, elimination of blockage of filter surface due to filter self-cleaning.

4 dwg