中文摘要：

为研究低张力泡沫体系多流态渗流特征，采用泡沫驱替试验分析泡沫渗流的瞬态和稳态变化特点、泡沫体系流动过程中的高、低干度流态区特征以及两种流态的转化条件。结果表明：泡沫在岩心内是逐渐形成的，当泡沫达到稳态后呈活塞式驱替；泡沫渗流具有多流态特征，在高干度流态区，压力梯度随液相速度增加而增加，压力梯度的对数值与液相速度呈较好的线性关系，而与气相速度关系不大；在低干度流态区，压力梯度随气相速度增加而增加．压力梯度的对数值与气相速度呈一定的线性关系，而与液相速度关系不大。

英文摘要：

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 condi- tions for transforming from one flow regime to the other flow 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 foam 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.