Table 4
Experimental design for IFT measurement.
| Number | Concentration of NPs in the FW (ppm) | Temperature (°C) | Pressure (psi) | |
|---|---|---|---|---|
| 1 | 250 | 80 | 1800 | |
| 2 | 250 | 60 | 1200 | |
| 3 | 250 | 40 | 600 | |
| 4 | 500 | 80 | 1800 | |
| 5 | 500 | 60 | 1200 | |
| 6 | 500 | 40 | 600 | |
| 7 | 750 | 80 | 1200 | |
| 8 | 750 | 60 | 600 | |
| 9 | 750 | 40 | 1800 | 14.7 |
| 10 | 1000 | 80 | 600 | |
| 11 | 1000 | 60 | 1800 | |
| 12 | 1000 | 40 | 1200 | |
| 13 | 1500 | 80 | 1200 | |
| 14 | 1500 | 60 | 600 | |
| 15 | 1500 | 40 | 1800 | |
| 16 | 2000 | 80 | 600 | |
| 17 | 2000 | 60 | 1800 | |
| 18 | 2000 | 40 | 1200 | |