SCREENED PIPE Russian patent published in 2011 - IPC E21B43/08 

FIELD: mining.

SUBSTANCE: screened pipe consists of concentrically arranged external and intermediate pipes, an adapter, the external and internal pipes in the upper part are connected to each other by means of tangential nozzles, and the internal and the intermediate pipes in the lower part are connected to each other also with tangential nozzles, but are oppositely aligned. The circular gap between the intermediate and the internal pipes in the upper part, and also the upper and lower parts of the internal pipe are equipped with plugs, the external pipe in the upper part is equipped with elastic rings, and in the lower part - with a plug. The intermediate pipe is equipped with a filtering element installed inside it and arranged in the form of a perforated back taper with a perforation coefficient from 50 to 85%, and arranged in an axisymmetric manner to the intermediate pipe.

EFFECT: increased duration of filter operation by exclusion of filtering mesh clogging.

1 dwg