Another fundamental knowledge challenge is to establish a verified transient model of multiphase flow, which is experimentally validated. Currently two-phase flow systems are fairly well established. However, a rigorous three — or four-phase tran­sient model with experimental verification in flow loops is beyond the current state of the art. The accurate modeling and experimental validation of such phenomena in systems with coexistent of three or four of the gas, oil, water, ice, and hydrate phases will be vital to hydrate control in both energy production and flow assurance.