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Table 2 Fluid injection parameters and changes of water sample pH in each alternating cycle

From: The potential of coupled carbon storage and geothermal extraction in a CO2-enhanced geothermal system: a review

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