Deep fractured vuggy reservoirs are characterized by complex structures, harsh formation conditions and strong heterogeneity. Accordingly, foam stability was first assessed under high-temperature, high-pressure conditions. A microetched physical model mimicking the fractured vuggy reservoir was constructed. Then, the static features of the foam in the model was inspected. The flow characteristics and EOR mechanism of foam flooding in the microetched model were analyzed. Foam stability results show that at low pressures, the foam volume first increases and then decreases with increasing temperature. With increasing pressure, the influence of temperature on foam stability gradually declines. Within the microetched model, the foam displayed better fluidity in karst caverns, whereas better static stability is attained in the fractures. Gravity impacted oil recovery during water and foam flooding. Bottom water flooding induced uniform rise of the oil-water interface, hence achieving highest oil recovery of 49%. Foam flooding following helped recovering residual oil near the top of the caverns. Employing high-velocity foam flooding following low-velocity foam flooding increased the sweep efficiency of oil entrapped in the dead-end pores. Coupling bottom water flooding with foam flooding is the most promising technique.

深裂缝孔洞型油藏具有构造复杂、地层条件恶劣、非均质性强的特点。因此，首先在高温、高压条件下评估泡沫稳定性。构建了模拟裂缝性孔洞储层的微蚀刻物理模型。然后，检查模型中泡沫的静态特征。分析了微蚀模型中泡沫驱的流动特性和EOR机理。泡沫稳定性结果表明，在低压下，泡沫体积随温度升高先增大后减小。随着压力的增加，温度对泡沫稳定性的影响逐渐减弱。在微蚀刻模型中，泡沫在岩溶洞穴中表现出更好的流动性，而在裂缝中获得了更好的静态稳定性。在水驱和泡沫驱期间，重力影响采收率。底水驱使油水界面均匀上升，最高采收率达49%。随后的泡沫驱有助于回收洞穴顶部附近的残余油。在低速泡沫驱后采用高速泡沫驱提高了死端孔隙中油的波及效率。底水驱与泡沫驱耦合是最有前景的技术。在低速泡沫驱后采用高速泡沫驱提高了死端孔隙中油的波及效率。底水驱与泡沫驱耦合是最有前景的技术。在低速泡沫驱后采用高速泡沫驱提高了死端孔隙中油的波及效率。底水驱与泡沫驱耦合是最有前景的技术。