Research Article
Numerical Simulations of Chemical-Assisted Steam Flooding in Offshore Heavy Oil Reservoirs after Water Flooding
Table 4
The operational parameters of various thermal methods.
| | Thermal methods | Injection temperature, °C | Fluid injection rate, m3/d | Steam quality | Soaking time, d | Gas-liquid ratio | Foaming agent concentration, % | Surfactant concentration, % | Size of nitrogen foam slug, d | Size of surfactant slug, d | Number of chemical injection round |
| | HWF | 200 | 200 | — | — | — | — | — | — | — | — | | SF | 340 | 200 | 0.5 | — | — | — | — | — | — | — | | CSS | 340 | 200 | 0.5 | 5 | — | — | — | — | — | — | | CASF | 340 | 200 | 0.5 | — | 2 : 1 | 0.5 | 0.3 | 30 | 20 | 3 | | CAHWF | 80 | 200 | — | — | — | — | 0.3 | — | 20 | 3 |
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