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Experiment on multiple flow regime characteristics of foam system
GUO Lan-lei
(Geological Science Research Institute of Shengli Oilfield,S1N0PECt Dongying 257015, China)
Abstract:
In order to investigate the multiple flow regime characteristics of the foam system with a low tension, the flow characteristics of the transient and steady state of the foam system were analyzed by using foam flooding experiments. The characteristics in flow regimes with high and low quality respectively were observed during the process of foam flooding. The conditions for transforming from one flow regime to the other {low regime were also obtained. The experimental results show that the foam generates gradually in the core and the piston-like displacement process appears when the foani system reaches steady state. Foam flooding has multiple flow regimes characteristics. In the high-quality flow regime, the pressure gradient increases with the liquid flow rate increasing. The logarithm of the pressure gradient has a good linear correlation with the liquid flow rate, while it has little relation with the gas flow rate. However, in the low-quality flow regime, the pressure gradient increases with the gas flow rate increasing. The logarithm of the pressure gradient has a linear correlation with the gas flow rate, while it has little relation with the liquid flow rate.
Key words:  foam system  high-quality flow regime  low-quality flow regime  seepage characteristics  physical simulation