**Acknowledgements**

We thank Nayef Alayad (Chemical Engineering Department, University of New Brunswick) for helping with the sand-pack displacement tests. We gratefully acknowledge Sasol Chemicals, SNF Floerger, Husky Energy Inc., and Corridor Resources Inc. for providing samples of surfactant, polymer, heavy oil, and natural condensate employed in this study. Financial support from the University of New Brunswick through the Sabbatical Research Grant and the Canada Foundation for Innovation, CFI, research grant is greatly appreciated.
