FIELD: oil and gas industry. SUBSTANCE: circular taper of upper packer is connected with adapter. It is fixed relative to body by shear screws with possibility of upward movement with respect to body until resting against coupling connected with body after screws are sheared. Stepped bushes are located with their smaller steps positioned in opposite directions as to their initial displacement at installing device down into borehole. EFFECT: improved operational reliability. 5 dwg
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