Objective In view of the fact that the existing research had not simulated the high temperature (≥120 ℃) and high pressure (≥40 MPa) conditions of the foam flooding, and the foam performance was difficult to reflect the real situation on site, the adaptive performance evaluation of five foam systems was carried out at the conditions of fractured vuggy reservoir with constant foam concentration of 1 wt%, pressure of 40 MPa and salinity of 22×10⁴ mg/L.

Methods The viscosity of foam base solution under different high temperature conditions was studied by high temperature and high pressure rheometer. The foaming volume, defoaming half-life and foam composite index under different high temperature conditions were studied by high temperature and high pressure foaming instrument. The morphology of high temperature foam was observed in situ by stereomicroscope.

Result The results showed that the order of foam with strong to weak temperature adaptability was determined as follows: double cross-linked polymer composite foam > differential dispersion gel reinforced foam > nanoblack card reinforced foam > conventional high-temperature foam > high temperature starch gel foam.

Conclusions Except for differential dispersion gel reinforced foam, the average diameter of foam of the other four foams showed significant increase trend when the temperature increased from 110 ℃ to 150 ℃. The double cross-linked polymer composite foam and differential dispersion gel reinforced foam had better high-temperature resistance. Except for double cross-linked polymer composite foam, for the other four foams, the viscosity, foaming volume, half-life and foam comprehensive index all decreased with the increase of temperature. While the foaming volume of the double cross-linked polymer composite foam increased with the increase of temperature.