Table 1
Parameters and their numerical values used in base case simulation.
| Physical meaning | Value |
|---|---|
| Hydration number (N h) | 6 |
| Porosity (ϕ) | 0.28 |
| Initial temperature of reservoir (T init) | 279 K |
| Initial gas pressure in reservoir (P init) | 2.51 MPa |
| Initial water saturation (S w0) | 0.9 |
| Initial hydrate saturation (S h0) | 0 |
| Initial gas saturation (S g0) | 0.1 |
Aqueous phase density ( ) |
1000 kg/m3 |
Solid rock phase density ( ) |
2675.1 kg/m3 |
CO2 hydrate phase density ( ) |
1100 kg/m3 |
CO2 hydrate heat capacity ( ) |
2220 J/kg K |
| Perimeter of the cross-section (Pcs) | 22 m |
| Area of the cross-section (Acs) | 10 m2 |
| Hydrate formation rate constant (K f) | 0.35 m mol/Pa s m2 |
| Specific area of hydrates (A SH) | 375 000 m2/m3 |
| Activation energy for CO2 hydrate (∆E) | 81 084 J/mol |
Aqueous phase viscosity ( ) |
1 mPa s |
Viscosity of CO2 in gas phase ( ) |
1.48 × 10−5 Pa s |
| Entry capillary pressure (P ec) | 5000.0 Pa |
Constant for capillary pressure ( ) |
0.65 |
| Irreducible gas phase saturation (S gr) | 0.0 |
| Irreducible aqueous phase saturation (S lr) | 0.2 |
Relative permeability constant for liquid ( ) |
4 |
| Relative permeability constant for gas (n g) | 2 |
CO2 hydrate heat capacity ( ) |
2220 J/kg-K |
| CO2 gas injection pressure (P inj) | 4 MPa |
| CO2 gas injection temperature (T inj) | 279 K |