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Table 2 Fluid injection parameters and changes of water sample pH in each alternating cycle
Number of alternating cycles | Experimental temperature (°C) | Injection parameter of SCCO2 | Injection parameter of water | pH | ||
|---|---|---|---|---|---|---|
Injection pressure (MPa) | Injection temperature (°C) | Average injection rate (mL/min) | Injection temperature (°C) | |||
0 | – | – | – | – | – | 6.5 |
1 | 200 ± 0.4 | 7.5 ± 0.1 | 40 ± 0.3 | 19.8 | 28 ± 0.7 | 4.1 |
2 | 201 ± 0.3 | 7.5 ± 0.06 | 39 ± 0.6 | 17.9 | 27 ± 0.8 | 4.4 |
3 | 200 ± 0.2 | 7.5 ± 0.1 | 40 ± 0.4 | 20.3 | 27 ± 0.4 | 4.5 |
4 | 200 ± 0.3 | 7.5 ± 0.08 | 40 ± 0.3 | 19.5 | 27 ± 0.7 | 4.5 |
5 | 200 ± 0.2 | 7.5 ± 0.13 | 40 ± 0.2 | 19.7 | 26 ± 0.6 | 4.6 |
6 | 200 ± 0.4 | 7.5 ± 0.05 | 40 ± 0.5 | 20.6 | 26 ± 0.8 | 4.7 |