Abstract
CO2 storage in saline aquifer is considered to be the most potential and most promising method to alleviate greenhouse effect and neutralize CO2. Rock wettability and heterogeneity study is crucial for CO2 storage in saline aquifer due to the complex geological structure of submarine surroundings. In this study, CO2 dynamic displacement process and imbibition process in sand cores were captured by CT scanning technology in different conditions (40 ℃, 8 Mpa and 25 ℃, 0.1 Mpa). Experiment result shows that stronger wettability is conducive to the occurrence of CO2 snap off and increases the safety of CO2 capillary capture and storage, while imbibition of weaker wettability porous media is more stable but CO2 is difficult to capture. Moreover, CO2-salt water interface was divided into three categories (interface aggregation nodes, interface clusters and interface monomers) and interface evolution low was quantified by the liner relationship of relative interface area (RIA) and salt water saturation (Sw). Upward imbibition is beneficial for CO2 storage according to the RIA of the upward imbibition process is about 1.3 times that of downward when salt water saturation keeps the same. Finally, the heterogeneity of the mixed sand significantly increases the contact area of the two phases than uniform sand for the same Reynolds number. The microscopic transport mechanism and morphological distribution characteristics of CO2-salt water in the pores in this paper has some implication for practical CO2 long-term and safe storage in saline aquifer.
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Abbreviations
- Sw :
-
salt water saturation
- RIA :
-
relative interface area
- PV :
-
pore volume
- \({a}_{i}\) :
-
specific interface area
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Zhang, W., Wu, B., Lv, P., Li, S., Jiang, L. (2022). Study on Seepage and Mass Transfer Characteristics During CO2 Storage in Saline Aquifer. In: Sun, B., Sun, J., Wang, Z., Chen, L., Chen, M. (eds) Proceedings of The Fourth International Technical Symposium on Deepwater Oil and Gas Engineering. DWOG-Hyd 2021. Lecture Notes in Civil Engineering, vol 246. Springer, Singapore. https://doi.org/10.1007/978-981-19-0960-3_21
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DOI: https://doi.org/10.1007/978-981-19-0960-3_21
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