Annular Barrier With Compensation Device

Abstract: 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 comprising a tubular part for mounting as part of the well tubular structure the tubular part having a longitudinal axis an expandable sleeve surrounding the tubular part and defining a space being in fluid communication with an inside of the tubular part each end of the expandable sleeve being connected with the tubular part and an aperture for letting fluid into the space to expand the expandable sleeve wherein the barrier further comprises a compensation device arranged in the space between the expandable sleeve and the tubular part the compensation device having a chamber in which a piston is arranged dividing the chamber in a first and a second chamber part the first chamber part being in fluid communication with the space and the second chamber part comprising gas.

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