In order to solve the problems of the uneven plane water flooding

great differences between the of vertical water absorption

and low recovery of the waterflooding during the high water cut exploitation period of the oilfield

a series of indoor evaluation experiments were conducted to improve the water absorption profile of CO

2

foam flooding. Then we established the flooding model by multiple core combination with the high and low permeability with the differential of 3

6 and 9. We used the CO

2

foam to displace the core to study the effect of the different

ial permeability and oil saturation difference on the improvement of water absorption profile during CO

2

foam flooding

and the CO

2

foam displacement efficiency. The results show that the effects of CO

2

foam improving the injection profile become better when the permeability reduces. And taking into account the displacement efficiency of CO

2

under different permeability ratio

the permeability of the same layer should be controlled within 6. Meanwhile

the effects of CO

2

foam on profile improvement gets better when the oil saturation increased. In the practical application

the range of oil saturation level should be 4

6. At present

the research results have been applied in the test of CO

2

foam flooding in Block A of Jilin Oilfield.