WELL SCREEN Russian patent published in 2014 - IPC E21B43/08 

FIELD: oil-and-gas industry.

SUBSTANCE: proposed device comprises metal pipe with holes stopped by plug from below and by coupling from above and cylindrical filter element arranged there inside and aligned therewith. Pipe top section with holes is composed by a separate section with no inside filter element coated with screen on the outside. Said section houses rubber diaphragm composed by the sleeve. Diaphragm thickness decreases in vertical line parallel with metal pipe axis and aligned with elongated hole major axis. Proposed filter is composed of sections connected by couplings. Pipe top section with holes is connected with pump on one side or with shank by coupling and with downstream filter section on opposite side.

EFFECT: higher reliability, simplified design, increased MTBR.

3 cl, 5 dwg