Dinh , D. H., Nguyen, M. Q., Pham , T. G., Hoang , L., Le, T. T. H., Cu , T. V. N., Pham , X. S., Nguyen , L. A., Ho , N. C., Pham , T. S., Nguyen , Q. H. and Tran , T. N. (2022) “A successful pilot application of the complex mixture surfactant polymer VPI SP to enhance oil recovery factor for the Lower Miocene, Bach Ho field”, Petrovietnam Journal, 100, pp. 19 - 27. doi: 10.47800/PVJ.2022.10-03.