| 摘要 |
The present invention relates to an annular barrier for being expanded in an annulus between a well tubular structure and an inside wall of a borehole downhole. The annular barrier comprises a tubular part for mounting as part of the well tubular structure; an expandable sleeve made of a first metal, surrounding the tubular part and defining a space being in fluid communication with an inside of the tubular part, the expandable sleeve having a longitudinal extension, an inner face facing the tubular part and two ends; a connection part made of a second metal, connecting the expandable sleeve with the tubular part; an opening for letting fluid into the space to expand the sleeve, and a transition area comprising a connection of the sleeve with the connection part. |
| 主权项 |
1. An annular barrier configured to be expanded in an annulus between a well tubular structure and an inside wall of a borehole downhole, comprising:
a tubular part for mounting as part of the well tubular structure, an expandable sleeve composed of a first metal, the expandable sleeve surrounding the tubular part and defining and having a surface in contact with a cavity, the cavity being configured to be in fluid communication with an inside of the tubular part, the expandable sleeve having a longitudinal extension, an inner face opposing the tubular part and two ends, a connection part composed of a second metal, the connection part being arranged at least partially in contact with the tubular part and configured to connect the expandable sleeve with the tubular part, an opening configured to let fluid into the cavity to expand the sleeve, and a transition area comprising a connection of the sleeve with the connection part, wherein:
the first metal is a more flexible type of metal than the second metal; andthe annular barrier comprises a restriction element in the transition area, the restriction element being configured to restrict expansion of the sleeve in the transition area. |
