may be activated from a collapsed travel position to a enlarged working position the liner hanger 108 may be expanded using any tool and technique known in the art expansion of the liner hanger 108 anchors the liner 100 and seals the liner top alternatively a conventional liner hanger may be used fig3 shows the liner hanger 108 expanded and set against casing 101 the inner string 120 may then be pulled out of the wellbore 150 in one embodiment the liner 100 may be cemented in the wellbore 150 in one embodiment the liner 100 may be radially expanded in one embodiment the liner 100 may be expanded at one or more discrete locations to effect zonal isolation or sand production control in one embodiment the liner 100 may include a sand control screen such as an expandable screen fig4 shows one embodiment of the inner string 120 also referred to as a u201c running tool u201d equipped with a jack piston device 200 the inner string 120 is shown disposed in a liner 100 the liner 100 is provided with a shoe 130 the inner string 120 includes a seal 225 for sealing against the liner 100 in one embodiment the piston device 200 includes a housing 250 movably disposed on the exterior of the inner string 120 a port 255 is provided to allow fluid communication between the interior of the inner string 120 and the housing 250 seals may be disposed between.