TY - JOUR
T1 - Numerical modelling of CO2 migration in heterogeneous sediments and leakage scenario for STEMM-CCS field experiments
AU - Saleem, Umer
AU - Dewar, Marius
AU - Chaudhary, Tariq Nawaz
AU - Sana, Mehroz
AU - Lichtschlag, Anna
AU - Alendal, Guttorm
AU - Chen, Baixin
N1 - Funding Information:
This research is supported by STEMM-CCS project received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No. 654462 . In-kind contributions from the University of Bergen are gratefully acknowledged. The authors also acknowledge the Research Council of Norway through the CLIMIT program funded project no 254711 (Baymode).
Funding Information:
This research is supported by STEMM-CCS project received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No. 654462. In-kind contributions from the University of Bergen are gratefully acknowledged. The authors also acknowledge the Research Council of Norway through the CLIMIT program funded project no 254711 (Baymode).
Publisher Copyright:
© 2021
PY - 2021/7
Y1 - 2021/7
N2 - The dynamics and plume development of injected CO2 dispersion and dissolution through sediments into water column, at the STEMM-CCS field experiment conducted in Goldeneye, are simulated and predicted by a newly developed two-phase flow model based on Navier-Stokes-Darcy equations. In the experiment, CO2 gas was released into shallow marine sediment 3.0 m below the seafloor at 120 m water depth in the North Sea. The pre-experimental survey data of porosity, grain size distributions, and brine concentration are used to reconstruct the model sediments. The gas CO2 is then injected into the sediments at a rate of 5.7 kg/day to 143 kg/day. The model is validated by diagnostic simulations to compare with field observation data of CO2 eruption time, changes in pH in sediments, and the gas leakage rates. Then the dynamics of the CO2 plume development in the sediments are investigated by model simulations, including the leakage pathways, the fluids interactions among CO2/brine/sediments, and CO2 dissolution, in order to comprehend the mechanisms of CO2 leakage through sediments. It is shown from model simulations that the CO2 plume develops horizontally in the sediments at a rate of 0.375 m/day, CO2 dissolution in the sediments is at an overall average rate of 0.03 g/sec with some peaks of 0.45 g/sec, 0.15 g/sec, and 0.3 g/sec, respectively, following the increase in injection rates, when some fresh brine provided. These, therefore, lead to a ratio of 0.90~0.93 of CO2 leakage rate to injection rate.
AB - The dynamics and plume development of injected CO2 dispersion and dissolution through sediments into water column, at the STEMM-CCS field experiment conducted in Goldeneye, are simulated and predicted by a newly developed two-phase flow model based on Navier-Stokes-Darcy equations. In the experiment, CO2 gas was released into shallow marine sediment 3.0 m below the seafloor at 120 m water depth in the North Sea. The pre-experimental survey data of porosity, grain size distributions, and brine concentration are used to reconstruct the model sediments. The gas CO2 is then injected into the sediments at a rate of 5.7 kg/day to 143 kg/day. The model is validated by diagnostic simulations to compare with field observation data of CO2 eruption time, changes in pH in sediments, and the gas leakage rates. Then the dynamics of the CO2 plume development in the sediments are investigated by model simulations, including the leakage pathways, the fluids interactions among CO2/brine/sediments, and CO2 dissolution, in order to comprehend the mechanisms of CO2 leakage through sediments. It is shown from model simulations that the CO2 plume develops horizontally in the sediments at a rate of 0.375 m/day, CO2 dissolution in the sediments is at an overall average rate of 0.03 g/sec with some peaks of 0.45 g/sec, 0.15 g/sec, and 0.3 g/sec, respectively, following the increase in injection rates, when some fresh brine provided. These, therefore, lead to a ratio of 0.90~0.93 of CO2 leakage rate to injection rate.
KW - Carbon Capture and storage
KW - CO dissolution
KW - CO Leakage
KW - Darcy resistance
KW - Gas migration
KW - Pipe flow
KW - Porosity and grain size distribution
KW - STEMM-CCS, CO injection
KW - Two-phase flow in porous media
UR - http://www.scopus.com/inward/record.url?scp=85105895546&partnerID=8YFLogxK
U2 - 10.1016/j.ijggc.2021.103339
DO - 10.1016/j.ijggc.2021.103339
M3 - Article
AN - SCOPUS:85105895546
SN - 1750-5836
VL - 109
JO - International Journal of Greenhouse Gas Control
JF - International Journal of Greenhouse Gas Control
M1 - 103339
ER -