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Abstract
The hybrid steam-solvent injection scheme has been applied but limited results have been reported in the literature. The optimum solvent concentration to maximize economics and to reduce the CO2 emission is still in question. A synthetic reservoir model was developed using real field data to study such an injection. Results indicate that the optimal solvent concentration is 5.0% by volume fraction and as the concentration increases the CO2 emission reduces. The optimum case has 21% gain in the net present value discounted by 12% per annual and 9.1% reduction in the CO2 emission comparing to the pure steam injection.
NOMENCLATURE
| NPV = | = | net present value |
| NCF = | = | net cash flow |
| i = | = | discount rate |
| n = | = | project's economic life in years |
| SAGD = | = | steam assisted gravity drainage |
| cSOR = | = | cumulative steam oil ratio |
| cEOR = | = | cumulative energy oil ratio |
| csOR = | = | cumulative solvent oil ratio |
| GJ = | = | gigajoule |
| $ = | = | U.S. Dollars |
| = | SI Metric Conversion Factors | |
| bbl × 1.5899 = | = | m3 |
| cp × 1.0 = | = | Pa.sec |
| 1 tonne = | = | 1000 kg |