WELL SCREEN Russian patent published in 2015 - IPC E21B43/08 

FIELD: oil and gas industry.

SUBSTANCE: device includes polymer fibrous screening filter element made as separate sections interconnected along outer perimeter by metal tie rods, which are screwed into subpump sleeve or end sleeve at one side and to batwing-shaped sleeve at the other side and one butt end of the filtering element is thrusted to its inner wing. The second butt end of the filtering element is thrusted to end sleeve or subpump sleeve, where valve element is made as feedthrough opening shaped as two cylinders with different base diameter installed one above another, with a gate corresponding in its configuration to the above feedthrough opening. Attachment reliability of the filtering element sections is ensured by double nuts.

EFFECT: improved efficiency of the well screen operation due to increased service life of filtering elements, in particular valve element, simplified movement of its gate.

2 cl, 3 dwg