Abstract: For production of high-water-cut reservoirs, water alternating gas (W AG) process could be adopted to improve the sweep efficiency, increase the producing reserves and enhance the oil recovery. Foamer as a mobility-control agent for a displacing medium could be properly used in W AG process in order to adjust the water or gas injection profile, improve the productivity and obtain better development effectiveness. In view of specific reservoir and geologic features,the behavior such as foamability and stability of several foamers are tested and evaluated un-der the different conditions, and the foamer volumes are optimized. By considering the relevant factors, the best foaming agent is obtained, which can meet the requirements of selectively plugging the water zones by its displacing adjustment and profile control during the process of gas drive.

Key words: gas drive, EOR, foam, behavior, experiment