WELL FILTER CLEANING DEVICE (VARIANTS) Russian patent published in 2006 - IPC E21B37/08 E03B3/18 E21B43/08 

FIELD: oil and water well filter cleaning equipment.

SUBSTANCE: in accordance with the first embodiment filter cleaning device comprises pipeline or pipe string, elastic cylinder and shut-off means to close flow of liquid to be pumped. The shut-off means is made as self-sustained oscillation system including tubular cylindrical body with side orifices, piston made as a cup and slidably arranged in tubular cylindrical body, spring supporting the piston and plug threadedly connected with tubular cylindrical body to regulate degree of string compression. The cylindrical body is threadedly connected with tubular body of elastic cylinder. In normal position upper piston end is close to lower elastic cylinder tubular body end. Device formed in accordance with the second embodiment comprises pipeline or pipe string, elastic cylinder and shut-off means to close flow of liquid to be pumped. Elastic cylinder comprises tubular body with side orifices connected with above pipeline or with pipe string and is threadedly fastened to tubular cylindrical body of the shut-off means. The elastic cylinder is enclosed with elastic shell sealed to tubular body ends and defining common inner cavity with the tubular body.

EFFECT: simplified structure, increased filter cleaning efficiency.

2 cl, 3 dwg