DEVICE FOR CUP CEMENTATION OF WELL Russian patent published in 2016 - IPC E21B33/14 E21B33/12 

FIELD: construction; oil and gas industry.

SUBSTANCE: invention relates to construction of oil and gas wells and, in particular, to devices for isolation of beds with application of packers. Device comprises a housing having radial holes. Casing of the devise forms an annular cavity with outer surface of the housing and has circulation holes. Differential bushing is placed inside the circular cavity opposite to the radial holes of the housing. This bushing forms a circulation chamber with inner surface of casing and has radial holes closed with a non-return valve. In the lower part of the housing there is a packer with a hydraulic action cup. There is a lower bushing with radial holes forming a flow chamber with housing inner surface. Lower bushing is connected to the body with a shear pin, at least one, and is placed opposite to the radial holes of the housing. Above the lower bushing there is an upper bushing with a seat for lower cementing plug. Upper bushing interacts with lower bushing and is connected to the casing by a shear pin, at least one. This bushing is placed over the casing circulation holes. Seat is placed into the lower bushing to shut off its radial holes, the seat is connected with the lower bushing with a shear pin, at least one. Device has the possibility, when the seat, of hydraulic connection with hydraulic cavity of the collar via radial holes of lower sleeve, flow chamber, radial holes of the housing, radial holes of the differential bushing and circulation chamber with pressure stabilization in the cavity of hydraulic packer cuff when design pressure setting due to hydraulic service life of the differential bushing from its axial travel with local pressure discharge through radial holes of the differential bushing into circulation cavity.

EFFECT: higher reliability.

3 cl, 1 dwg