DEVICE FOR SELECTIVE SEALING OF PRODUCTIVE FORMATION AT CASING CEMENTING Russian patent published in 2016 - IPC E21B33/13 E21B33/14 

FIELD: oil industry.

SUBSTANCE: invention relates to drilling oil and gas wells and can be used at cementing of production casings. Device contains casing with packer setting units at ends, four casings with bypass channels for passage of grouting mixture, located on housing in circumferential direction through 90°, and radial holes between them, located in circumferential direction through 90°. Casings are made through. Sectors of housing with radial holes are covered with packer setting flanges. Inside housing circular damper with holes on circular lug is arranged with possibility to turn. Said holes are located relative to holes of housing with shift to 45°. On inner surface of housing there are ledges arranged on it through 90°, at level of which on end surface of circular dampers are located mating ledges. Said ledges have possibility of engagement with face plate on pumping and compression pipes for extraction of formation fluid.

EFFECT: technical result is reduction of labour costs and improved manufacture ability of process control of formation fluid extraction after cementing of casing string.

1 cl, 4 dwg