Method and Apparatus for Downhole Tubular Expansion

A method and apparatus for expanding tubulars are disclosed. In one embodiment, an apparatus for radially expanding a tubular in a wellbore is disclosed. The apparatus includes an expansion swage. In addition, the apparatus includes at least one anchoring device for selective and releasable anchoring of selected parts of the apparatus to an inner surface of the tubular. The apparatus also includes a thruster providing a force for longitudinal movement of the expansion swage inside the tubular. Moreover, the apparatus includes a hydraulic valve for selective control of a flow of operating fluid to the thruster. The hydraulic valve includes a valve cylinder slidably positioned on a shaft and a position control device for selective and releasable securing a position of the valve cylinder on the shaft. The hydraulic valve also includes an elastic device for shifting the valve cylinder between two end positions.