Research Article
Mechanism of Enhanced Oil Recovery for In-Depth Profile Control and Cyclic Waterflooding in Fractured Low-Permeability Reservoirs
Table 3
Oil recovery of different enhanced oil recovery methods.
| | Measures | Effective permeability level of matrix (10-3 μm2) | Injection pressure before diversion (MPa) | Injection pressure after diversion (MPa) | Enhanced oil recovery methods | Recovery ratio (%) | Improved recovery efficiency (%) |
| | 1 | 30 | 0.34 | — | Single waterflooding | 45.1 | — | | 2 | 30 | 0.37 | 0.93 | Single in-depth profile control | 50.3 | 5.2 | | 3 | 30 | 0.35 | — | Single cyclic waterflooding | 46.6 | 1.5 | | 4 | 30 | 0.36 | 1.03 | In-depth profile control+cyclic waterflooding | 52.2 | 7.1 |
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