Article
Water Resources
Rui Wang, Maziar Arshadi, Mohammad Piri
Summary: In this study, the impact of pore space deformation on trapping mechanisms of supercritical CO2 (scCO2) during storage in deep saline aquifers was investigated. Various tests were performed on a miniature sandpack sample, and x-ray microtomography techniques were used to analyze the changes in pore space and fluid occupancy. The results showed that the compression of the sandpack during scCO2 injection led to additional storage of scCO2, while the contraction of the pore space impaired capillary trapping. Furthermore, the dissolution process caused shrinking of trapped scCO2 clusters and globules, leading to changes in fluid displacement events.
ADVANCES IN WATER RESOURCES
(2023)
Article
Energy & Fuels
Yongfei Yang, Quan Xu, Xinze Li, Lianjin Zhang, Xuemei Lan, Junjie Wang, Kai Zhang, Hai Sun, Lei Zhang, Jun Yao
Summary: Understanding the transport process of gas-water flow in volcanic gas reservoir is crucial for natural gas production. This study investigated the influence of volcanic reservoir type, capillary number, and wettability on gas-water flow. Simulation results showed that eddy currents in dead-end corners play a major role in residual gas formation, and at high temperature and pressure, higher capillary numbers resulted in less residual gas in dead-end corners. The wettability of rock affected the shape of displacement front and the saturation of residual gas.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Civil
Kue-Young Kim, Minji Kim, Junho Oh
Summary: Geologic heterogeneity significantly influences CO2 trapping in target reservoirs for sequestration. This study conducted Darcy-scale multiphase flow experiments to investigate residual trapping and dissolution processes of CO2 under different saturations, revealing the increasing importance of capillary heterogeneity with higher initial saturation. Time-resolved X-ray images provide a detailed understanding of dynamic trapping processes in heterogeneous media, contributing to various applications such as environmental remediation and energy resource enhancement.
JOURNAL OF HYDROLOGY
(2021)
Article
Water Resources
Ramin Moghadasi, Sepideh Goodarzi, Yihuai Zhang, Branko Bijeljic, Martin J. Blunt, Auli Niemi
Summary: The process of remobilizing CO2 trapped under pressure depletion was studied using high-resolution 3D X-ray microtomography. The results showed that an increase in saturation beyond the residual value is required for the gas to be mobilized, and Ostwald ripening and continuing exsolution can significantly change the fluid saturation, leading to gas flow upwards. This has important implications for CO2 storage, as it enhances gas migration and reduces the potential for gas trapping during storage operations.
ADVANCES IN WATER RESOURCES
(2023)
Article
Engineering, Chemical
Yanbin Gong, Mohammad Sedghi, Mohammad Piri
Summary: A new dynamic pore-network modeling platform is introduced for studying capillary trapping behavior in rough-walled fractures, providing insights into the effects of wettability, gravity, and viscous forces on the saturation of non-wetting phases. The results demonstrate how adjusting operational settings can impact the removal of non-wetting phases from fractured media.
TRANSPORT IN POROUS MEDIA
(2021)
Article
Engineering, Chemical
Kai Li, Karl-Heinz A. A. Wolf, William R. Rossen
Summary: In this study, foam experiments in a 1-m-long glass model fracture show that under certain conditions, foam reaches local equilibrium, with finer texture and reduced gas trapping related to the geometry of the fracture.
TRANSPORT IN POROUS MEDIA
(2021)
Article
Energy & Fuels
Kristina Rasmusson, Maria Rasmusson, Alexandru Tatomir, Yvonne Tsang, Auli Niemi
Summary: This study aims to improve the understanding of residual trapping in sandstone from the Heletz site by using 3D-image analysis on core sample CT-data. Pore-network flow modeling was employed to estimate the IR curve, showing a good ability to residually trap CO2. This study provides valuable information for predictive macroscopic-scale simulations.
GREENHOUSE GASES-SCIENCE AND TECHNOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Yihuai Zhang, Branko Bijeljic, Ying Gao, Sepideh Goodarzi, Sajjad Foroughi, Martin J. Blunt
Summary: We used high-resolution three-dimensional X-ray imaging to investigate hydrogen injection and withdrawal in the pore space of Bentheimer sandstone. The results were compared with a similar experiment using nitrogen. It was found that hydrogen showed less trapping due to lower initial saturation, and after imbibition, there was a significant rearrangement of the trapped hydrogen with no change in overall gas volume. This rearrangement was facilitated by concentration gradients of dissolved gas in the aqueous phase, potentially leading to improved gas connectivity and more efficient withdrawal.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Energy & Fuels
Jian Tian, Yili Kang, Lijun You, Na Jia, Zhiyu Xi, Pingya Luo
Summary: This study investigated the formation process of water phase trapping (WPT) in tight gas reservoirs through both pore-scale and core-scale experiments. Snap-off and circumfluous flow were identified as the two major mechanisms for breaking bulk gas flow and generating trapped gas during WPT formation. Analysis of gas permeability and water saturation changes in response to WPT formation provided insights into the macroscopic consequences for gas flow ability.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Green & Sustainable Science & Technology
Reza Sedaghatinasab, Shahin Kord, Jamshid Moghadasi, Aboozar Soleymanzadeh
Summary: Residual or capillary trapping is an important mechanism of CO2 trapping in underground porous media. Experimental investigation has shown that relative permeability and capillary pressure are affected by saturation changing direction or hysteresis, as well as by the absolute permeability and CO2 injection strategy.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2021)
Article
Chemistry, Physical
Qipeng Ma, Weiyao Zhu, Wengang Bu, Zhiyong Song, Hua Li, Yajing Liu
Summary: This study compares the differences in residual oil distribution and oil displacement mechanisms between capillary force-driven and gravity-driven systems through core and pore-scale experiments. The results show significant differences in residual oil treatment and oil displacement between capillary force-driven and gravity-driven systems, and the micro mechanisms behind these differences are revealed through the study of contact angles and solid-liquid interfacial forces.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Green & Sustainable Science & Technology
Shahrokh Bahrami Kashkooli, Asghar Gandomkar, Masoud Riazi, M. Sadegh Tavallali
Summary: The study demonstrates the feasibility of using genetic algorithms to improve gas storage efficiency and field oil efficiency by trapping CO2 in porous media. This enhances the security and capacity of storage by increasing the residual and CO2 capillary trappings in porous media.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2022)
Article
Environmental Sciences
Ramin Moghadasi, Sajjad Foroughi, Farzad Basirat, Steven R. McDougall, Alexandru Tatomir, Branko Bijeljic, Martin J. Blunt, Auli Niemi
Summary: Pore-network modeling is used to understand the physics of remobilization of trapped CO2. The study reveals that gas remobilization occurs at a higher saturation than residual trapping, and is influenced by network properties and mechanisms. The findings also show a reduction in gas relative permeability, indicating a slow release of trapped gas due to remobilization. These results have important implications for underground gas and CO2 storage.
WATER RESOURCES RESEARCH
(2023)
Article
Mechanics
Yongfei Yang, Shaobin Cai, Jun Yao, Junjie Zhong, Kai Zhang, Wenhui Song, Lei Zhang, Hai Sun, Vadim Lisitsa
Summary: Characterizing the trapped phase in porous media is crucial for various engineering applications. This study focuses on the distribution, evolution, and influencing factors of remaining oil during water flooding at the pore scale. The results indicate that complex pore structures lead to remaining oil generation and phase recirculation, with different wettability and capillary number impacting the process. Changing wettability and increasing capillary number can help reduce remaining oil saturation.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2021)
Article
Geosciences, Multidisciplinary
Arjen Mascini, Marijn Boone, Stefanie Van Offenwert, Shan Wang, Veerle Cnudde, Tom Bultreys
Summary: The study investigated multiphase flow in heterogeneous rocks with different wetting properties, revealing significant variability in driving force balance between different pores and a key role of viscous forces in the dynamics. The complex interplay between mixed wettability and pore structure exacerbated these differences, emphasizing the need for further research on the fundamental controls on multiphase flow in geomaterials.
GEOPHYSICAL RESEARCH LETTERS
(2021)
