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Table 2
Selection criteria for CO2 in oil reservoirs.
| Reservoir characteristics | Suitable for miscible | Suitable for immiscible |
|---|---|---|
| Recovery stage | Primary, secondary, or undeveloped | Primary, secondary, or undeveloped |
| OOIP (MMSTB) | ≥12.5 | ≥12.5 |
| Depth (ft) | ≥1600 and ≤13.365 | ≥1150 and ≤8.500 |
| Oil gravity (°API) | ≥22 and ≤45 | ≥11 and ≤35 |
| Temperature (°F) | ≥82 and ≤260 | ≥82 and ≤198 |
| Oil viscosity (mPa s) | ≥0.4 and ≤6 | ≥0.6 and ≤592 |
| Pressure (psi) | ≥MMP | <MMP |
| Porosity (%) | ≥3 and ≤37 | ≥17 and ≤32 |
| Initial oil saturation (%) | ≥26.5 | ≥30 |
Note: m = 3.28 ft; kPa = 0.145 psi; C = (°F – 32) × 5/9; mPa s = cP; Crude oil density (kg/m3) = 1000 × 141.5/(131.5 + °API), 1 STB = 0.159 m3; MMSTB = Million Standard Barrels. MMP is Minimum Miscible Pressure.
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