DOWNHOLE FILTERING DEVICE Russian patent published in 2016 - IPC E21B43/08 

FIELD: oil and gas industry.

SUBSTANCE: device contains a tubular framework, a top branch pipe with release drain holes, an external and internal slotted strainer out of a wound profile and longitudinal rods, uniformly arranged along the circle with the creation between them of longitudinal channels, that look at each other, and are connected at the top with the release holes of the top branch pipe, a ring partition covering the longitudinal channels at the bottom, and a safety valve. The longitudinal rods of the external and internal slotted strainer are made abutting to each other. The longitudinal channels of both the strainers are connected with each other. The tubular framework is perforated and located in the internal slotted strainer, and at the bottom it is closed by the safety valve.

EFFECT: increased service life of the downhole filtering device due to self-cleaning of the slotted strainers, and its increased compactness upon keeping of the filtering surface area.

2 dwg