Open Access
Table 1
Selection criteria for implementing CO2 miscible flooding and immiscible flooding [27–31, 36, 38, 39, 41, 45–47].
| Reservoir characteristics | Suitable for miscible | Suitable for immiscible |
|---|---|---|
| Recovery stage | Primary, secondary, or undeveloped | Primary, secondary, or undeveloped |
| Remaining oil fraction in the reservoir | ≥20% | ≥20% |
| Remaining oil fraction in the reservoir (MMSTB) | ≥5 | ≥5 |
| Initial oil in place (MMSTB) | ≥12.5 | ≥12.5 |
| Gravity (API) | ≥22 and ≤45 | ≥11 and ≤35 |
| Viscosity (mPa·s) | ≥0.4 and ≤6 | ≥0.6 and ≤592 |
| Porosity (%) | ≥3 and ≤37 | ≥17 and ≤32 |
| Pressure (psi) | ≥MMP | <MMP |
| Oil saturation (%) | ≥26.5 | ≥30 |
| Formation type | Sandstone or Carbonate | Sandstone |
| Permeability (md) | ≥1.5 and ≤4500 | ≥30 and ≤1000 |
| Net thickness | Wide Range | NC |
| Depth (ft) | ≥1600 and ≤13.365 | ≥1150 and ≤8.500 |
| Temperature (°F) | ≥82 and ≤260 | ≥82 and ≤198 |
| Permeability variation coefficient | ≤0.6 | ≥0.5 and ≤0.55 |
| Oil reservoir dip (°) | >10 | NC |
| Oil Wetness Index | ≥0.4 and ≤1 | NC |
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