An emerging method to increase the recovery of oil from subsurface reservoirs is the application of measurement and control techniques to better control the multiphase flow in the reservoir over the entire production period. In particular the use of sensors and remotely controllable valves in wells and at surface, in combination with large-scale reservoir flow models is promising. Various elements from process control may play a role in such 'closed-loop' reservoir management, in particular optimization, parameter estimation and model reduction techniques. (C) 2008 Elsevier Ltd. All rights reserved