FIELD: oilfield equipment.
SUBSTANCE: invention relates to oilfield equipment and can be used as part of downhole pumping equipment for isolating perforation intervals in oil reservoirs with low reservoir pressure. The device is installed at the pump inlet and includes the upper and lower parts of the housing provided with centralizers, between which a cup cuff and a check valve are placed. The upper part of the body is perforated. The body is made in the form of a single cylindrical part. The check valve is formed by a seat and a check ball placed in a cage, and located flush with the cup cuff. Transition couplings are installed on the upper and lower parts of the body with the help of threaded connections.
EFFECT: possibility of simultaneous extraction of oil fluid from under the packer and backwashing of the production string and pump without formation of a zone of calming of mechanical impurities of formation fluid in the over-packer zone is provided, hydrodynamic impact on the formation is excluded while maintaining its productive properties.
3 cl, 3 dwg
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