Synchrotron-based pore-network modeling of two-phase flow in Nubian Sandstone and implications for capillary trapping of carbon dioxide
| Autor: | Chaozhong Qin, Anozie Ebigbo, Mahmoud Hefny, Martin O. Saar |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Capillary pressure
020209 energy Mineralogy FOS: Physical sciences 02 engineering and technology Management Monitoring Policy and Law Industrial and Manufacturing Engineering law.invention Physics - Geophysics Carbon capture and storage 020401 chemical engineering law 0202 electrical engineering electronic engineering information engineering Pore-network modelling CO2-plume geothermal Nubian Sandstone (Egypt) Residual trapping 0204 chemical engineering Geothermal gradient Computational Physics (physics.comp-ph) Pollution Synchrotron Plume Geophysics (physics.geo-ph) General Energy Imbibition Two-phase flow Saturation (chemistry) Relative permeability Physics - Computational Physics Geology |
| Zdroj: | International Journal of Greenhouse Gas Control, 103 |
| ISSN: | 1750-5836 1878-0148 |
| DOI: | 10.3929/ethz-b-000445894 |
| Popis: | Depleted oil fields in the Gulf of Suez (Egypt) can serve as geothermal reservoirs for power generation using a CO-Plume Geothermal (CPG) system, while geologically sequestering CO. This entails the injection of a substantial amount of CO into the highly permeable brine-saturated Nubian Sandstone. Numerical models of two-phase flow processes are indispensable for predicting the CO-plume migration at a representative geological scale. Such models require reliable constitutive relationships, including relative permeability and capillary pressure curves. In this study, quasi-static pore-network modelling has been used to simulate the equilibrium positions of fluid–fluid interfaces, and thus determine the capillary pressure and relative permeability curves. Three-dimensional images with a voxel size of 0.65 of a Nubian Sandstone rock sample have been obtained using Synchrotron Radiation X-ray Tomographic Microscopy. From the images, topological properties of pores/throats were constructed. Using a pore-network model, we performed a sequential primary drainage, main imbibition cycle of quasi-static invasion in order to quantify (1) the CO and brine relative permeability curves, (2) the effect of initial wetting-phase saturation (i.e. the saturation at the point of reversal from drainage to imbibition) on the residual-trapping potential, and (3) study the relative permeability-saturation hysteresis. The results improve our understanding of the potential magnitude of capillary trapping in Nubian Sandstone, essential for future field-scale simulations. International Journal of Greenhouse Gas Control, 103 ISSN:1750-5836 ISSN:1878-0148 |
| Databáze: | OpenAIRE |
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