| 摘要 |
Device for annular isolation in oil/gas wells comprising a production tube, the production tube comprises coaxially positioned, cylindrical sleeve (5) havin g in one end an at least partially radially directed opening slot (2), said sleeve including a cylindric sealing crown (1) coupled in one end to a release mechanism (3, 4) adapted t o push the sealing crown (1) out through the opening, said sealing crown (1) in its oth er end being expandable in the tangential direction.
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