Patent ID: 10344555

Abstract:
The present invention relates to an annular barrier (1) to be expanded in an annulus (2) between a well tubular structure (3) and an inside wall (5) of a bore-hole (6) downhole for providing zone isolation between a first zone (101) and a second zone (102) of the borehole. The annular barrier comprises a tubular metal part (7) for mounting as part of the well tubular structure; an expandable sleeve (8) surrounding the tubular metal part and having an inner face (9) facing the tubular metal part and an outer face (10) facing the inside wall of the borehole, each end (12,13) of the expandable sleeve being connected with the tubular metal part; and an annular space (15) between the inner face of the expandable sleeve and the tubular metal part. The annular space comprises at least one thermally decomposable compound (16), which compound is thermally decomposable below a temperature of 400° C. and is adapted to generate gas or super-critical fluid upon decomposition. Furthermore, the invention relates to a downhole system and a method of expanding an annular barrier.