Downhole tubular system and assembly for sealing an opening

Abstract

The present invention relates to a downhole system () for sealing an opening () in a wall of a well tubular structure in a borehole () downhole by means of a downhole tubular assembly (), comprising the downhole tubular assembly comprising an expandable tubular part () having an inner face () and an unexpanded expandable tubular thickness in an unexpanded state, and a helical spring () having a helical inner diameter, a radial helical spring thickness and a helical outer diameter in an unexpanded state, the helical spring being arranged inside the expandable tubular part and substantially concentrically with the expandable tubular part, an expansion tool () for expanding the tubular assembly inside the well tubular structure () in one direction, the expansion tool comprising an expansion part having a diameter, and the expansion tool being arranged substantially on an axis which is concentric and longitudinal with the tubular assembly, and positioned in a first position, wherein the expandable tubular part is expanded by moving the expansion tool from the first position through the expandable tubular part and the helical spring so that the helical spring extends the diameter of the expansion part and acts as a distance element when expanding the expandable tubular part to abut the well tubular structure for sealing the opening. Furthermore, the present invention relates to a downhole tubular assembly and a method of sealing an opening in a wall of a well tubular structure in a borehole downhole.