This paper reports on the use of a high pH chemical flood reservoir simulator to simulate high pH coreflood experiments. The coreflood experiments include one alkaline flood, two alkaline/polymer floods under two different salinity environments and an alkaline/surfactant/polymer flood. The agreement between the experimental and numerical oil recoveries and produced chemical compositions is very encouraging and supports the validity of the mathematical model used in the simulator. The importance of the preflush brine salinity, mobility control and effective salinity gradient using a cosurfactant as observed in the experimental data are also evident from the numerical results. Most of the fundamental mechanisms known for micellar/polymer flooding also seem to apply to high pH chemical floods, especially the dominant effect of low interfacial tension. This is the first time that comparisons have been made between a mechanistic reservoir simulator and high pH coreflood experiments. Such comparisons have yielded new insights into high pH chemical flooding.

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