DEVICE FOR ISOLATION OF FORMATION IN WELL Russian patent published in 2016 - IPC E21B33/12 

FIELD: oil industry.

SUBSTANCE: invention relates to devices for isolation of formation in well. Device for isolation of formation in well includes housing with top radial hole, at least one, closed with hollow shear pin, bottom radial hole, at least one, closed with check valve, casing with radial opening, at least one, arranged outside housing and forming together with latter circular chamber in upper part of which against radial hole of casing there is spring-loaded stepped bushing, in lower part of said chamber against lower radial holes of housing there is differential bushing, at upper end of which is freely placed circular pusher, packer with sealing element placed in lower part of housing. Outer surface of housing forms with inner surfaces of stepped bushing and differential bushing in two circular pockets, upper and lower, in first of which there are retainers with support locking tabs, every of which has possibility of recharge, moving into lower annular pocket during device operation. Retainer for stepped bushing has possibility of interaction of its lower end with upper end of circular pusher to provide axial mechanical movement of differential bushing, opening by latter of lower radial hole of housing and communicating inner cavity of housing with cavity of packer.

EFFECT: technical result consists in improvement of reliability, improved operational characteristics.

1 cl, 1 dwg