Research Article
Laboratory Study of the Displacement Coalbed CH4 Process and Efficiency of CO2 and N2 Injection
Table 2
Displacement experiment conditions and the results of different pressures of gas injection.
| Number | Injectant gas | Injection pressure/MPa | Displaced volume | Sweep efficiency/% |
| Test 1 | N2 | 1.5 | 0.4 | 93.8 | Test 2 | N2 | 1.8 | 0.5 | 95.26 | Test 3 | N2 | 2.2 | 0.3 | 97.11 | Test 4 | CO2 | 1.5 | 2.4 | 94.44 | Test 5 | CO2 | 1.8 | 2.2 | 97.14 | Test 6 | CO2 | 2.2 | 1.9 | 98.28 |
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