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Foam flooding is a promising enhanced oil recovery (EOR) method for water-flooded reservoir due to its good mobility control capability. When foam is injected into oil reservoirs, it will contact with oil, and oil will affect the performance of foam. Therefore, the effect of oil on the properties of foam has always been a key research topic for foaming flooding, but it is also a very controversial subject. Many researchers reported that the presence of oil is detrimental for foam stability, but some others believe...