DEVICE FOR ISOLATION OF FORMATION IN WELL Russian patent published in 2016 - IPC E21B33/13 E21B33/12 

FIELD: oil and gas industry.

SUBSTANCE: invention can be used for isolation of formation, at least one, in the well as when gluing with application of cementing casing string and in the form of separate independent insulation operations. Device includes a housing with top radial hole, at least one shut off with a hollow shear pin. Body has bottom radial hole, at least one closed by a check valve. Between the said radial holes, the body has top and bottom longitudinal slots. Outside of the housing the casing forming with the housing a ring chamber is located. In the upper part of the ring chamber there is an upper spring-loaded differential bushing rigidly connected to the housing with a shear pin, at least one. In the lower part of the ring chamber there is a lower differential bushing rigidly connected to the housing with a shear element, at least one, and covers the bottom radial hole of the housing. In the lower part of the housing there is a packer with a sealing element. Device is made so that allows after destruction of hollow shear pin release top of the differential bushing, transmission via the upper longitudinal slots on lower differential bushing unlocked last and providing hydraulic connection of the housing cavity with the packer sealing element through the lower radial hole of the housing and its lower lengthwise slots. When the packer is in its working position, there is a possibility of shutting off the lower radial holes of the housing with the lower differential bushing using pressure in the cavity of packer sealing element.

EFFECT: simplified design, higher reliability and improved operational characteristics.

3 cl, 1 dwg