DOWNHOLE EXPANDABLE ASSEMBLY AND DOWNHOLE SYSTEM

摘要

The present invention relates to a downhole expandable assembly for arrangement in a borehole in a well to prevent formation collapse of an unconsolidated sand formation. The downhole expandable assembly comprises a tubular metal part 7 for mounting as part of a well tubular structure 5, the tubular metal part 7 having a longitudinal extension and an expansion opening 6; an expandable metal sleeve 8 surrounding the tubular metal part 7 and having an inner face 9 facing the tubular metal part 7 and an outer face 10 facing a wall 11 of the borehole 3; a first end 12 and a second end 13 of the expandable metal sleeve 8 being connected with the tubular metal part 7; and an annular space 15 between the inner face 9 of the expandable metal sleeve 8 and the tubular metal part 7. The downhole expandable assembly further comprises an expandable screen 16 arranged on the outer face 10 of the expandable metal sleeve 8 so that the expandable screen 16 is forced outwards by the expandable metal sleeve 8 during expansion of the expandable metal sleeve 8 into a position where the expandable screen 16 at least partly abuts the unconsolidated sand formation.