... gas-liquid flow behavior and optimize the operating parameters of a continuous pig lift system. More specifically, first, two new flow theories, i.e., non-instantaneous separation and three-segment flow, are proposed to simulate the transient two-phase upward flow process during which the pig...

... Abstract The foam-drive process has been considered in the oil and gas industry as an enhanced oil recovery method. However, practical application of this process is rather restricted. The main limitation of foam field application is the complexity of its flow behavior in porous media...