FIELD: construction of underground reservoirs. SUBSTANCE: device has partly cased well in which outer and inner pipe columns are arranged with clearance, and sealing unit arranged above casing shoe in clearance between casing and inner pipe column. Sealing unit has through bypass channels with outlet tangential connections located at level of designed roof of reservoir. Inner pipe column has end extension installed for axial travel. Inner pipe column is perforated in near- bottom area and is provided with movable gate. EFFECT: enhanced reliability of device, reduced time and cost of reservoir making. 7 dwg
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