WELL FILTER Russian patent published in 1997 - IPC

FIELD: oil and gas production industry. SUBSTANCE: filter is used at secondary opening of productive reservoirs for better quality of operation. Filter is simple in design and is of high strength. Filter has tubular body with holes which are closed by stoppers. Stoppers have bush with pipe. Bush and pipe together can extend from holes. Located in inner side of body is removable plug which is seated in bush. Pipe is connected with bush and fixed relative to body. Filter is provided with stopping member installed in tubular body. EFFECT: high efficiency. 3 dwg