Downhole packer assembly

A downhole packer assembly for expansion of a metal patch in a well downhole in a well tubular metal structure, the downhole packer assembly comprising:

• a body part, and
• an expandable tubular element surrounding the body part and each end of the expandable tubular element being connected with the body part, providing an expandable space therebetween, the expandable space being fillable with liquid during expansion, the expandable tubular element having an outer face and an inner face, the expandable tubular element comprising an elastomeric or rubber material having a friction coefficient,
• wherein the expandable tubular element comprises a friction-enhancing material providing a higher friction coefficient of the outer face than the friction coefficient of the elastomeric or rubber material, and
• wherein the downhole packer assembly further comprises the metal patch, releasably attached with the expandable tubular element, the metal patch having an outer face to engage and seal with the well tubular metal structure and an inner face releasably engaged with the friction enhancing material on the outer face of the expandable tubular element.