The present invention relates to a downhole well tubular structure configured to be arranged in a borehole in a formation, comprising a well tubular part having an opening and an inner face, the well tubular part having an axial extension, a first sleeve configured to slide within the well tubular part along at least part of the inner face, the first sleeve having a first end face and a second end face, the first sleeve having a first sleeve groove facing away from the well tubular part, the first sleeve groove of the first sleeve having a first groove face extending radially and facing away from the first end face, and the first sleeve groove of the first sleeve having a second groove face inclining away from the first groove face, wherein the well tubular part has a first inclined face facing the first end face of the first sleeve, the first inclined face inclining from the inner face away from the first sleeve, wherein the well tubular part comprises a second inclined face facing the first inclined face, the second inclined face inclining from the inner face away from the first sleeve, and the first sleeve is configured to slide towards the first inclined face while uncovering or covering the opening. The present invention also relates to a downhole system comprising a downhole well tubular structure according to the present invention and to a sleeve operating method for uncovering or covering an opening in the downhole well tubular structure according to the present invention.