WELL BED ISOLATION DEVICE Russian patent published in 2012 - IPC E21B33/13 

FIELD: oil and gas industry.

SUBSTANCE: invention pertains to oil and gas industry and can be used for beds isolation in a well in the course of its casing. Device for beds isolation in a well includes hollow casing with radial hole and hollow shear pin in it, hydraulic packer, outer sleeve that forms cavity with the casing opposite its radial hole, spring-loaded element and device position switch made in a form of a sleeve with cam slot with sockets for pin connected by grooves. Cam slot has two additional sockets; operating element and cam slot code of position switch are performed with the possibility of reciprocal movement of operating element with device switching from operating position with extension of packer sealing element into position of packer disengagement from hydraulic action and then into operating position of pre-packering with extension of sealing element. Device position switch can be made in a form of a bushing with four cam slots symmetrically arranged along its generatrix, in 90°, with a pin in every slot, with the possibility of switch movement with rotation in relation to all four pins according to the code of its cam slot in the course of pressure increase and fall in the device. Operating element can be performed in a form of a sleeve or plunger-valve located in the housing of valve assembly that has a channel between plunger-valve and cavity located opposite the radial hole of the casing.

EFFECT: provision of higher reliability of packering through the possibility of annular space pre-packering after main packering and packer disengagement from hydraulic action.

4 cl, 5 dwg