Oilfields around the world are aging. As these reservoirs near the end of their productive life the number of wells that need to be plugged and abandoned is rising exponentially. It goes without saying that this has to be done in a safe, economic and environmentally responsible way. In the North Sea alone there are 5,000 wells to be abandoned over the next twenty to thirty years (source: Royal Academy of Engineering). The engineering challenge is significant. Not only is the environment often harsh, but the infrastructure is generally old, unstable and unpredictable. This combination increases operational complexity and uncertainty.