Imperial College London
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DrBrankoBijeljic

Faculty of Engineering, Department of Earth Science & Engineering

Principal Research Fellow
 
 
 
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Contact

 

+44 (0)20 7594 6420b.bijeljic

 
 
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Location

 

2.53Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Alhosani:2021:10.1016/j.ijggc.2020.103232,
author = {Alhosani, A and Lin, Q and Scanziani, A and Andrews, E and Zhang, K and Bijeljic, B and Blunt, MJ},
doi = {10.1016/j.ijggc.2020.103232},
journal = {International Journal of Greenhouse Gas Control},
pages = {1--15},
title = {Pore-scale characterization of carbon dioxide storage at immiscible and near-miscible conditions in altered-wettability reservoir rocks},
url = {http://dx.doi.org/10.1016/j.ijggc.2020.103232},
volume = {105},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Carbon dioxide storage combined with enhanced oil recovery (CCS-EOR) is an important approach for reducing greenhouse gas emissions. We use pore-scale imaging to help understand CO2 storage and oil recovery during CCS-EOR at immiscible and near-miscible CO2 injection conditions. We study in situ immiscible CO2 flooding in an oil-wet reservoir rock at elevated temperature and pressure using X-ray micro-tomography. We observe the predicted, but hitherto unreported, three-phase wettability order in strongly oil-wet rocks, where water occupies the largest pores, oil the smallest, while CO2 occupies pores of intermediate size. We investigate the pore occupancy, existence of CO2 layers, recovery and CO2 trapping in the oil-wet rock at immiscible conditions and compare to the results obtained on the same rock type under slightly more weakly oil-wet near-miscible conditions, with the same wettability order. CO2 spreads in connected layers at near-miscible conditions, while it exists as disconnected ganglia in medium-sized pores at immiscible conditions. Hence, capillary trapping of CO2 by oil occurs at immiscible but not at near-miscible conditions. Moreover, capillary trapping of CO2 by water is not possible in both cases since CO2 is more wetting to the rock than water. The oil recovery by CO2 injection alone is reduced at immiscible conditions compared to near-miscible conditions, where low gas-oil capillary pressure improves microscopic displacement efficiency. Based on these results, to maximize the amount of oil recovered and CO2 stored at immiscible conditions, a water-alternating-gas injection strategy is suggested, while a strategy of continuous CO2 injection is recommended at near-miscible conditions.
AU  - Alhosani,A
AU  - Lin,Q
AU  - Scanziani,A
AU  - Andrews,E
AU  - Zhang,K
AU  - Bijeljic,B
AU  - Blunt,MJ
DO  - 10.1016/j.ijggc.2020.103232
EP  - 15
PY  - 2021///
SN  - 1750-5836
SP  - 1
TI  - Pore-scale characterization of carbon dioxide storage at immiscible and near-miscible conditions in altered-wettability reservoir rocks
T2  - International Journal of Greenhouse Gas Control
UR  - http://dx.doi.org/10.1016/j.ijggc.2020.103232
UR  - https://www.sciencedirect.com/science/article/pii/S1750583620306575?via%3Dihub
UR  - http://hdl.handle.net/10044/1/86287
VL  - 105
ER  -
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