| 摘要 |
<p>The present invention relates to an annular barrier to be expanded in an annulus between a well tubular structure and an inside wall of a borehole downhole for providing zone isolation between a first zone and a second zone of the borehole. The annular barrier comprises a tubular part for mounting as part of the well tubular structure, an expandable metal sleeve surrounding the tubular part and having an inner face facing the tubular part and an outer face facing towards the inside wall of the borehole, each end of the expandable metal sleeve being connected with a connection part which is connected with the tubular part, a space between the inner face of the expandable metal sleeve and the tubular part, and an expansion opening in the tubular part through which fluid may enter into the space in order to expand the expandable metal sleeve, wherein the annular barrier further comprises a first safety metal sleeve surrounding the tubular part and abutting the expandable metal sleeve and said first safety metal sleeve having a first inner face abutting the face of the expandable metal sleeve, each end of the first safety metal sleeve being connected with the connection part which is connected with the tubular part.</p> |
