Abstract:Aiming at the difficulty of pressure maintaining and the low performance caused by steam channeling in heavy oil reservoirs,the physical modeling of profile control and displacement by steam foam flooding was studied in this paper. In order to contrast the oil displacement efficiency and factional flow of different flooding patterns including foam assisted steam flooding and high temperature gas assisted steam flooding, a dual sand-packed tube is designed to accomplish the experiments according to the geological characteristics. The results indicate that the foaming agent or foam, whose oil displacement performance is better than the other flooding patterns,can not only plug the tube with high permeability but also start the tube with low permeability in the model. High temperature gas assisted steam flooding has a slightly better oil displacement effect contrasted with pure steam flooding, and only increases oil recovery by about 1-3 percent. Moreover, the foam can control the flow direction to make the liquid producing capacity of the dual sand-packed tube uniform, this result shows that the foam flooding is suitable for the heterogeneous formation. The contrast in oil displacement performance of different flooding patterns shows that the mixed gas-foam flooding is the best flooding pattern for Fubei 3 block, whose combined oil displacement efficiency reaches 54.8%, which is enhanced by 30.7% contrasted with pure steam flooding.