TY - JOUR
T1 - The correlation between coal swelling and permeability during CO2 sequestration
T2 - A case study using Kushiro low rank coals
AU - Anggara, Ferian
AU - Sasaki, Kyuro
AU - Sugai, Yuichi
N1 - Funding Information:
This work was partly supported by JSPS KAKENHI (Grant-in-Aid for Scientific Research for challenging Exploratory Research, Grant No. 15 K14276 ). We thank Kushiro Coal Mine, Ltd., for providing the coal samples. Finally, the authors wish to thank Tim A. Moore and Tennille Mares for their insightful comments.
Publisher Copyright:
© 2016 Elsevier B.V.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2016/9/1
Y1 - 2016/9/1
N2 - This study investigates the relationship between Kushiro lignite-subbituminous coal matrix swelling and gas permeability during CO2 sequestration. Banded and non-banded coal samples have been used in swelling experiments. Banded coal samples tend to have anisotropic swelling, whereas non-banded samples tend to have isotropic swelling. The ratio of strain perpendicular/parallel to the bedding plane was 1.1 up to 4.2. A continuous measurement of coal swelling and permeability was conducted using core samples of 5 cm in diameter and 10 cm in length under various triaxial stress conditions using a Hassler type core holder. The permeability decreases with increasing confining stress under constant effective stress up to 60% for certain conditions. Because there is increasing adsorption volume with increasing pore pressure, adsorption-induced coal swelling has a direct impact on decreasing permeability. However, under constant confining pressure, reduction of CO2 gas permeability due to coal matrix swelling with increasing pore pressure was not observed because it was compensated by decreasing effective stress. This result shows that the decrease of effective stress has a more complex effect on gas permeability than coal matrix swelling.
AB - This study investigates the relationship between Kushiro lignite-subbituminous coal matrix swelling and gas permeability during CO2 sequestration. Banded and non-banded coal samples have been used in swelling experiments. Banded coal samples tend to have anisotropic swelling, whereas non-banded samples tend to have isotropic swelling. The ratio of strain perpendicular/parallel to the bedding plane was 1.1 up to 4.2. A continuous measurement of coal swelling and permeability was conducted using core samples of 5 cm in diameter and 10 cm in length under various triaxial stress conditions using a Hassler type core holder. The permeability decreases with increasing confining stress under constant effective stress up to 60% for certain conditions. Because there is increasing adsorption volume with increasing pore pressure, adsorption-induced coal swelling has a direct impact on decreasing permeability. However, under constant confining pressure, reduction of CO2 gas permeability due to coal matrix swelling with increasing pore pressure was not observed because it was compensated by decreasing effective stress. This result shows that the decrease of effective stress has a more complex effect on gas permeability than coal matrix swelling.
UR - http://www.scopus.com/inward/record.url?scp=84994048410&partnerID=8YFLogxK
UR - http://www.sciencedirect.com/science/article/pii/S0166516216304931
U2 - 10.1016/j.coal.2016.08.020
DO - 10.1016/j.coal.2016.08.020
M3 - Article
AN - SCOPUS:84994048410
VL - 166
SP - 62
EP - 70
JO - International Journal of Coal Geology
JF - International Journal of Coal Geology
SN - 0166-5162
ER -