Patent ID: 7377310

Claim:
A system for expanding a tubular element extending into a wellbore formed in an earth formation, the system comprising: an expander arranged to expand the tubular element by virtue of axial movement of the expander though the tubular element; an activating system for inducing the expander to move through the tubular element, the activating system including a plurality of activating tools, wherein the activating system further comprises a control system for controlling the activating system, including a remote control unit and for each activating tool a respective controller, the remote control unit being arranged to transmit an acoustic signal to an acoustic conductor selected from said tubular element and another elongate member extending into the borehole, each controller being arranged to receive said acoustic signal from the acoustic conductor and to control the corresponding activating tool upon receipt of said acoustic signal, wherein each controller is provided with a respective energy source, the energy sources being set up to activate the respective activating tools at mutually different frequencies or volumes of the acoustic signal.