DEVICE FOR LIP-TYPE CEMENTING OF WELL Russian patent published in 2010 - IPC E21B33/14 

FIELD: oil-and-gas production.

SUBSTANCE: device includes hollow casing and jacket forming between each other chamber and implemented each of them with radial opening. Device allows annular shutter overlapping radial openings of casing. On casing in its part, there are installed top and bottom annular sealing collars. Between those collars it is installed double-ended annular saddle, fixed on casing by shear element, at least, by one. In annular chamber it is located hydraulic pusher. It is a bushing with saddle in bottom part and radial openings over them, installed in casing on shear pin, at least one with ability of fluid message, herewith its axial movement under action of excessive pressure in well, cavities of casing in annular chamber, cavity of casing with annular chamber through its bottom radial openings and radial openings of casing. It is provided ability of movement of annular casing, at following increasing of excessive pressure in well for opening of radial openings of casing. Additionally it is provided ability of contiguous interaction of hydraulic pusher with top annular sealing collar and annular saddle up to movement of bottom annular collar on double-ended annular saddle and top annular sealing collar.

EFFECT: reliability growth of device operation and simplification of its structure.

4 cl, 1 dwg