An Investigation of the Robustness of Physical and Numerical Vanishing Interfacial Tension Experimentation in Determining CO₂ + Crude Oil Minimum Miscibility Pressure

Table 4

Comparison of the experimental IFT [15, 16] at the highest experimental pressure with the calculated (parachor) IFT values (this study) at 114.4°C (238°F) for constant and variable mol ratio feed mixtures of CO₂ + live crude oil system reported by Sequeira [15] and Sequeira et al. [16].

Mol ratio of supercritical CO2 + live crude oil in feed mixture	Type	Highest experimental; pressure (MPa)	Measured IFT value; (mN/m) [15, 16]	Calculated IFT value; (mN/m) (this study)
89 + 11	Constant mol ratio	41.3	0.01	0.018
70 + 30	Constant mol ratio	41.3	0.01	0.029
88–95 mol% CO2	Variable mol ratio; (constant volume ratio: 85 + 15)	34.5	0.65	0.177
53–74 mol% CO2	Variable mol ratio; (constant volume ratio: 45 + 55)	41.3	0.02	0.030