# A New CO\({}_{2}\)-EOR Methods Screening Model Based on Interdependency Parameters
## 3 Results and Discussion
### Immiscible CO\({}_{2}\)-EOR Screening Model  
Table 4 provides a complete simultaneous and individual combination screening model for immiscible CO\({}_{2}\)-EOR. Therefore, all five parameters in the simultaneous screening model A are covered in 2 PC and by 75% data diversity, as shown in Figure 12a. Figure 12b gives the eigenvectors for each PC. As shown in Figure 13, the limit of simultaneous model A is 12.1 with a confidence level of 99.5%. In other words, any value of \(T_{A}^{2}\) less than 12.1 means that the immiscible CO\({}_{2}\)-EOR is amenable. Based on the correlation of \(T_{A}^{2}\) expressed in Table 4, \(T_{A}^{2}\) is more influenced by oil gravity and viscosity than the other three parameters. The simultaneous screening model B depends on the value of \(T_{B}^{2}\), as shown in Figure 14, which means immiscible CO\({}_{2}\)-EOR is suitable if \(T_{B}^{2}\) is less than 12.1. In addition, the \(T_{B}^{2}\) value is governed by porosity and permeability.  
Figure 11: Miscible CO\({}_{2}\)-EOR box plot and swarm plot: (**a**) oil saturation and (**b**) net thickness.  
Figure 10: (**a**) Simultaneous boundary ellipse and (**b**) the Hotelling \(T^{2}\) chart for miscible CO\({}_{2}\)-EOR simultaneous screening model B.  
\begin{table}
\begin{tabular}{l l l l} \hline \hline  & & \multicolumn{2}{c}{**Screening Model**} \\ \hline \multicolumn{2}{l}{Simultaneous A:} & \multicolumn{2}{c}{\(T_{A}^{2}=\left(0.364176\times PC1^{2}\right)+\left(0.92776\times PC2^{2}\right)\)} \\ \(\bullet\) & MMP, psi & if \(T_{A}^{2}<12.1\), then immiscible CO\({}_{2}\)-EOR \\ \(\bullet\) & Temperature, \({}^{\circ}\)F & \(PCI=\left(0.000173\times Depth\right)+\left(0.05312\times API\right)-\left(0.00 089\times Visc\right)+\left(0.011223\times Temp\right)+\left(0.00034\times MMP\right)\) \\ \(\bullet\) & Depth, ft & \(-5.07638\) \\ \(\bullet\) & Oil Gravity, \({}^{\circ}\)API & \(PC2=\left(0.0007563\times Depth\right)-\left(0.04427\times API\right)+\left(0.0 02297\times Visc\right)+\left(0.004473\times Temp\right)+\left(0.000365\times MMP \right)-1.11169\) \\ \hline \multicolumn{2}{l}{Simultaneous B:} & \multicolumn{2}{c}{\(T_{B}^{2}=\left(1.3478\times X^{2}\right)-\left(1.3693\times X\times Y\right)+ \left(1.3478\times Y^{2}\right)\)} \\ \(\bullet\) & Porosity, \(\%\) & If \(T_{B}^{2}<12.1\), then immiscible CO\({}_{2}\)-EOR \\ \(\bullet\) & Permeability, md & \(X=\frac{\text{For}-22.4}{6.6}\) and \(Y=\frac{\text{Perm}-516}{6075}\) \\ \hline \multirow{4}{*}{Individual for Oil saturation, \%} & Minimum & \(=\)22 & Q1 (25 th percentile) & \(=\)45 \\  & Maximum & \(=\)83.5 & Q2 (50 th percentile) & \(=\)50 \\  & Mean & \(=\)52.13 & Q3 (75 th percentile) & \(=\)60 \\  & Standard Deviation & \(=\)14.40 & \\ \hline \multirow{4}{*}{Individual for Net Thickness, ft} & Minimum & \(=\)5.2 & Q1 (25 th percentile) & \(=\)38.8 \\  & Maximum & \(=\)300 & Q2 (50 th percentile) & \(=\)71 \\  & Mean & \(=\)78.17 & Q3 (75 th percentile) & \(=\)98 \\ \cline{1-1}  & Standard Deviation & \(=\)60.27 & \\ \hline \hline \end{tabular}
\end{table}
Table 4: Summary of the immiscible CO\({}_{2}\)-EOR screening model.  
Figure 12: (a) Scree plot and (b) eigenvectors of PCA for immiscible CO\({}_{2}\)-EOR simultaneous screening model A.  
Figure 13: The Hotelling \(T^{2}\) chart for simultaneous screening model A for immiscible CO\({}_{2}\)-EOR.  
Figure 15 provides data distribution on the individual screening parameters of immiscible CO\({}_{2}\)-EOR, namely oil saturation and net thickness. Individual screening criteria for oil saturation have a minimum data of 22%, as of that of Weeks Island Field [23], and a maximum data of 83.5%, as of that of Ponte Dirillo Field [24]. Net Thickness screening criteria have a minimum data of 5.2 ft, as of that of Yaoyingtai Field [12], and a maximum data of 300 ft, as of that of Huntington Beach Field [12].