The key to foam assisted steam flooding is to search for the foaming agent with good thermal stability and high-temperature foaming property. Through the studies, the high-temperature resistant foaming agent system for heavy oil steam flooding is achieved and furthermore the performances and practical effects of this system are investigated. At room temperature, the half-life of the high-temperature resistant foaming agent with foam stabilizer can reach 273 min. The resistance factors decrease with the increases of the temperature and the oil saturation in the core. After the oil saturation exceeding 15% , the controlling ability of the foam on the steam mobility reduces sharply, the foam has much better steam-mobility controlling ability in the high-permeability reservoirs. The resistance factor is much bigger when the gas fluid ratio is in the range from 0. 5 to 1.5. The three-tube model test for steam / foam flooding shows that this system can block those steam-crossed channels and moreover divert the injected steam from high-permeability blocks to low ones, finally the oil recovery in the low-permeability blocks can be further enhanced.%泡沫辅助蒸汽驱的关键在于寻找热稳定性和高温发泡性能良好的发泡剂,通过研究得到了适用于稠油蒸汽驱的耐高温发泡剂体系并考察了该体系的性能及其应用效果.常温下,加入稳泡剂的耐高温发泡剂的半衰期可达273 min.阻力因子随温度的升高及岩心含油饱和度的增加而降低,含油饱和度超过15％时泡沫控制蒸汽流度的能力急剧降低,泡沫在高渗透层中控制蒸汽流度的能力良好,气液比为0.5 ～1.5时的阻力因子较高.用于蒸汽+泡沫驱的三管模型实验表明,该体系可封堵汽窜通道,使蒸汽从高渗区转向低渗区而提高其采收率.
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