Research Article
Experimental Study on Enhanced Oil Recovery by Nitrogen-Water Alternative Injection in Reservoir with Natural Fractures
Table 4
Summary of orthogonal experimental design results.
| No. | Gas-water slug ratio | Injection velocity (mL/min) | Injection volume in one cycle (PV) | Gas injection volume in one cycle (PV) | Water injection volume in one cycle (PV) | Oil recovery (%) |
| 1 | 0.5 : 1 | 0.6 | 0.5 | 0.17 | 0.33 | 24.15 | 2 | 0.5 : 1 | 0.4 | 1 | 0.33 | 0.67 | 24.75 | 3 | 0.5 : 1 | 0.2 | 2 | 0.67 | 1.33 | 26.09 | 4 | 0.5 : 1 | 0.1 | 5 | 1.67 | 3.33 | 22.68 | 5 | 1 : 1 | 0.6 | 1 | 0.50 | 0.50 | 24.82 | 6 | 1 : 1 | 0.4 | 0.5 | 0.25 | 0.25 | 25.43 | 7 | 1 : 1 | 0.2 | 5 | 2.50 | 2.50 | 22.34 | 8 | 1 : 1 | 0.1 | 2 | 1.00 | 1.00 | 26.15 | 9 | 2 : 1 | 0.6 | 2 | 1.33 | 0.67 | 23.34 | 10 | 2 : 1 | 0.4 | 5 | 3.33 | 1.67 | 22.27 | 11 | 2 : 1 | 0.2 | 0.5 | 0.33 | 0.17 | 26.22 | 12 | 2 : 1 | 0.1 | 1 | 0.67 | 0.33 | 26.35 | 13 | 4 : 1 | 0.6 | 5 | 4.00 | 1.00 | 21.14 | 14 | 4 : 1 | 0.4 | 2 | 1.60 | 0.40 | 23.14 | 15 | 4 : 1 | 0.2 | 1 | 0.80 | 0.20 | 23.48 | 16 | 4 : 1 | 0.1 | 0.5 | 0.40 | 0.10 | 22.74 |
|
|