FIELD: oil producing industry; devices for segregation of formations. SUBSTANCE: device has a body consisting of two concentric pipes forming a circular channel with a packer unit installed on its ends. At least one of packer units has flexible sealing members. At least one packer unit is used in the form of a filtering hose provided with split rings. Reinforcing members are located inside the filtering hose. Packer units are installed on the device body with possible change of a distance between them. EFFECT: improved sealing of annular space in wells with complicated wellbores. 3 cl, 2 dwg
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