Imperial College London
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ProfessorMartinBlunt

Faculty of Engineering, Department of Earth Science & Engineering

Chair in Flow in Porous Media
 
 
 
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Contact

 

+44 (0)20 7594 6500m.blunt Website

 
 
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Location

 

2.38ARoyal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Zhang:2023:10.1029/2022gl102383,
author = {Zhang, Y and Bijeljic, B and Gao, Y and Goodarzi, S and Foroughi, S and Blunt, MJ},
doi = {10.1029/2022gl102383},
journal = {Geophysical Research Letters},
pages = {1--8},
title = {Porescale observations of hydrogen trapping and migration in porous rock: demonstrating the effect of Ostwald ripening},
url = {http://dx.doi.org/10.1029/2022gl102383},
volume = {50},
year = {2023}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We use high-resolution three-dimensional X-ray imaging to study hydrogen injection and withdrawal in the pore space of Bentheimer sandstone. The results are compared with a replicate experiment using nitrogen. We observe less trapping with hydrogen because the initial saturation after drainage is lower due to channeling. Remarkably we observe that after imbibition, if the sample is imaged again after 12 hr, there is a significant rearrangement of the trapped hydrogen. Many smaller ganglia disappear while the larger ganglia swell, with no detectable change in overall gas volume. For nitrogen, the fluid configuration is largely unchanged. This rearrangement is facilitated by concentration gradients of dissolved gas in the aqueous phase—Ostwald ripening, We estimate the time-scales for this effect to be significant, consistent with the experimental observations. The swelling of larger ganglia potentially increases the gas connectivity, leading to less hysteresis and more efficient withdrawal.
AU  - Zhang,Y
AU  - Bijeljic,B
AU  - Gao,Y
AU  - Goodarzi,S
AU  - Foroughi,S
AU  - Blunt,MJ
DO  - 10.1029/2022gl102383
EP  - 8
PY  - 2023///
SN  - 0094-8276
SP  - 1
TI  - Porescale observations of hydrogen trapping and migration in porous rock: demonstrating the effect of Ostwald ripening
T2  - Geophysical Research Letters
UR  - http://dx.doi.org/10.1029/2022gl102383
UR  - https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022GL102383
UR  - http://hdl.handle.net/10044/1/105833
VL  - 50
ER  -
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