Controlled separation of gas, oil and water, efficient treatment and handling of the produced water and reliable transport of the hydrocarbons are central areas in subsea processing. In order to optimise these processes, proper fluid characterization and fundamental understanding of the underlying phenomena, like flocculation, coalescence, precipitation, sedimentation and creaming, is required. The overall goal for this research area is to develop new methods for advanced fluid characterization at conditions relevant for subsea processing.