Patent ID: 8157007

Claim:
A method for lining a well or a duct having a wall with an inflatable bladder with a flexible and elastic membrane, comprising: introducing a length of cylindrical tube into the well or the duct to be lined, the tube having sections which are attached end-to-end; and radially expanding areas of the tube with an inflatable bladder so a wall of the tube bears against the wall of the well or the duct; wherein the inflatable bladder is mounted at the end of a manoeuvring and control rod which is actuated from a control station; wherein only certain areas of the tube are radially expanded, the number of which areas is at least equal to three, and which areas are spaced apart from each other by non-expanded portions so a total length of the expanded areas is notably smaller than a total length of the non-expanded areas; at least partially deflating the inflatable bladder; and displacing the at least partially deflated bladder from an expanded zone to a next zone to be expanded by pulling or pushing the manoeuvring and control rod; wherein the tube is provided with at least one sensor placed against the external surface of the tube inside a wall recess which is intended to be only partly expanded.