METHOD FOR EXPANDING A TUBULAR ELEMENT IN A WELLBORE

摘要

A method of expanding a tubular element (4) in a borehole comprising installing the tubular element at a selected location in the borehole, installing a pulling string (6) in the borehole, the pulling string having an upper part (6a) connected to the pulling device (8) at surface and a lower part (6b) provided with an expander (12) of outer diameter larger than the inner diameter of the tubular element, the expander being arranged below at least part of the tubular element to be expanded, the upper part being connected to the lower part by a connector (14) allowing rotation of the upper part relative to the lower part, and pulling the expander through said at least part of the tubular element by operating the pulling device so as to pull the pulling string in upward direction, and simultaneously rotating said upper part relative to said lower part.