Tubing expansion

摘要

There are disclosed tools and apparatus for use in expanding downhole tubing. In one embodiment, there is disclosed a tubing expansion tool comprising a mandrel defining at least one curved support surface, and at least one expansion member defining a curved bearing surface for contact with the support surface and corresponding to the mandrel support surface, the member being movable relative to the mandrel whereby the surfaces are in contact and movable over one another to move the expansion member from a smaller diameter first configuration towards a larger diameter second configuration.