Minimum miscibility pressure (MMP) is an important optimization parameter for an
enhanced oil recovery process involving Carbon Dioxide or hydrocarbon gas injection.
Therefore an accurate experimental measurement is required to determine the MMP. The
MMP for a gas-oil system is directly related to the interfacial tension between the
injected gas and the reservoir crude oil. When COz gas contacts the reservoir oil at
reservoir temperature, the interfacial tension between the fluid-fluid phases reduces as the
miscibility is approached and the interface between the fluid-fluid phases eventually
disappears at miscibility i.e. the interfacial tension becomes zero. Hence, a pressure
condition of zero interfacial tension at reservoir temperature is the minimum miscibility
pressure for a COz-reservoir crude oil system. The Vanishing Interfacial Technique (VIT)
technique to determine MMP is based on this principle. Therefore, this research project
involves the measurement of gas-oil interfacial tensions for a COz-live reservoir oil
system at reservoir conditions using the pendant drop and the capillary rise techniques to
determine the minimum miscibility pressure through the VIT technique.