SCREENED PIPE Russian patent published in 2010 - IPC E21B43/08 

FIELD: oil and gas industry.

SUBSTANCE: screened pipe consists of concentric arranged external and internal pipes and of filter element. The external pipe is blanked-off from beneath and is connected with the internal pipe by a sub under which there are made inlet channels communicating external space of the external pipe with internal space. From beneath the internal pipe is equipped with a hollow cylinder diffuser with an upper face narrowing upward to external surface of the internal pipe. The filter element is made in form of a chamber with a hollow filter inside pressure tight connected with the sub from beneath, while from the top it is connected with an additional sub wherein a blanked-off from beneath filter is fixed. The filter around external surface is equipped with through slits long sides of which converge to external surface.

EFFECT: increased efficiency of operation.

1 dwg