Annular barrier and downhole system

Abstract

The present invention relates to an annular barrier to be expanded in an annulus having an annulus pressure between a well tubular metal 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 metal part for mounting as part of the well tubular metal structure, the tubular metal part having a bore with a bore pressure, and an expandable metal sleeve surrounding the tubular metal part, each end of the expandable metal sleeve being connected with the tubular metal part, and an expandable space between the expandable metal sleeve and the tubular metal part, wherein the annular barrier further comprises a pressure-intensifying unit having a first opening in fluid communication with the annulus or the bore for increasing the pressure of the fluid from the annulus or the bore before the fluid enters the expandable space, the annular barrier further comprising a activation chamber having a chamber pressure and being fluidly connected to a second opening of the pressure-intensifying unit in order to create a pressure difference between the annulus pressure/the bore pressure and the chamber pressure for activating the pressure-intensifying unit to increase the pressure of the fluid, the chamber pressure being lower than the annulus pressure or the bore pressure, or the chamber pressure being higher than the annulus pressure or the bore pressure. The invention also relates to a downhole system comprising a well tubular metal structure and at least one annular barrier where the tubular metal part is mounted as part of the well tubular metal structure.

Dependencies are inferred from the claim text.