Expandable downhole tubing

A tubular member for a wellbore, the tubular member comprising coupling means to facilitate coupling of the tubular member into a string, the tubular member further including at least one recess wherein a material is located within the recess, the material selected from a group consisting of friction materials and sealing materials, and wherein the at least one recess is weakened to facilitate deformation of the at least one recess.

An expander device comprising a body provided with a first annular shoulder, and a second annular shoulder spaced apart from the first annular shoulder, the second annular shoulder having an outer diameter greater than an outer diameter of the first annular shoulder, wherein the shoulders apply a radial force to an inside surface of an expandable tubular member.

A method of lining a borehole in an underground formation, comprising lowering a tubular member into the borehole, the tubular member including coupling means to facilitate coupling of the tubular member into a string, the coupling means disposed on an annular shoulder of the tubular member having an increased inner diameter and provided at at least one end of the tubular member, the tubular member further including at least one recess wherein a material is located within the recess, and applying a radial force to the tubular member using an expander device to induce a radial deformation of the tubular member, wherein the material is selected from a group consisting of friction materials and sealing materials.