Pore-scale modelling of three-phase capillary pressure curves directly in uniformly wet rock images
| Autor: | Yulong Zhao, Johan Olav Helland, Yingfang Zhou, Dimitrios G. Hatzignatiou, Jianchao Cai |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
QE1-996.5
Work (thermodynamics) Capillary pressure Materials science Article Subject 010504 meteorology & atmospheric sciences Capillary action Pore scale 0208 environmental biotechnology Geology Characterisation of pore space in soil 02 engineering and technology Mechanics Energy minimization 01 natural sciences 020801 environmental engineering Physics::Fluid Dynamics Three-phase General Earth and Planetary Sciences Saturation (chemistry) 0105 earth and related environmental sciences |
| Zdroj: | Geofluids Geofluids, Vol 2021 (2021) |
| Popis: | In this work, we developed a semianalytical model to compute three-phase capillary pressure curves and associated fluid configurations for gas invasion in uniformly wet rock images. The fluid configurations and favorable capillary entry pressures are determined based on free energy minimization by combining all physically allowed three-phase arc menisci. The model was first validated against analytical solutions developed in a star-shaped pore space and subsequently employed on an SEM image of Bentheim sandstone. The simulated fluid configurations show similar oil-layer behavior as previously imaged three-phase fluid configurations. The simulated saturation path indicates that the oil-water capillary pressure can be described as a function of the water saturation only. The gas-oil capillary pressure can be represented as a function of gas saturation in the majority part of the three-phase region, while the three-phase displacements slightly reduce the accuracy of such representation. At small oil saturations, the gas-oil capillary pressure depends strongly on two-phase saturations. |
| Databáze: | OpenAIRE |
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