Table 3 Time of characteristic time points at different CO2 injection pressures.
From: Effect of CO2 injection pressure on enhanced coal seam gas extraction
CO2 injection pressure/MPa | CO2 Breakthrough time/min | CH4 concentration changes dramatically/% | Time required for drastic changes/min | The time corresponding to the gas concentration of 30%/min | Gas concentration of 6% corresponding to the time /min |
|---|---|---|---|---|---|
0.6 | 83.40 | 100 ~ 0.4% | 186.14 | 122.32 | 155.72 |
0.8 | 77.83 | 100 ~ 0.2% | 159.30 | 111.54 | 143.87 |
1.0 | 68.10 | 100 ~ 0.14% | 122.00 | 92.29 | 114.48 |
