Article
Thermodynamics
Chao Tang, Wen Zhou, Zhangxin Chen, Jiabao Wei
Summary: Shale gas is an important unconventional fossil fuel resource. Carbon capture and sequestration in shale gas reservoirs, known as CO2-EGR, can sequester 45%-60% of injected CO2 in the shale reservoir while providing 10%-15% incremental gas recovery. Factors such as formation temperature, mean pore size, and injection rate greatly impact the feasibility of CO2-EGR.
Article
Energy & Fuels
Jinsheng Wang, Hanin Samara, Philip Jaeger, Vivien Ko, Dustin Rodgers, David Ryan
Summary: This study evaluates CO2 adsorption under pressure and temperature conditions for geological storage in two non-shale reservoirs in Canada. The results show that CO2 adsorption can substantially increase storage capacity and decrease leaking potential by reducing overpressure in the reservoir caprock. The adsorption behaviors of rocks from different reservoirs are distinct, and CO2 can enter small rock pores to enhance adsorption and utilization of reservoir capacity.
Article
Engineering, Chemical
Phanikumar Pentyala, Pinak Bhusan Mohapatra, Parag A. Deshpande
Summary: The study utilizes van der Waals-corrected density functional theory calculations to investigate the energetics of interactions between shale minerals and methane, carbon dioxide, providing detailed mechanisms behind the displacement of methane by carbon dioxide, conclusively proving the stronger adsorption of CO2 and the kinetic feasibility of its displacement, offering insights into the successful CO2 sequestration during enhanced gas recovery processes.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Energy & Fuels
Dong Wang, Yongming Li, Bo Wang, Jiquan Shan, Libin Dai
Summary: To enhance shale gas production, feasible enhanced gas recovery (EGR) approaches need to be investigated. In this study, re-fracturing was compared with a huff-n-puff gas injection scheme in a shale gas reservoir. Different fracturing fluids were evaluated and the results showed that re-fracturing yielded better recovery performance than huff-n-puff gas injection.
FRONTIERS IN ENERGY RESEARCH
(2023)
Article
Engineering, Environmental
Yingnan Wang, Zhehui Jin
Summary: The volume partitioning between nanopores and macropores/fractures has a significant effect on the CO2 'huff-n-puff' process in shale gas exploitation, impacting hydrocarbon adsorption, compositions, recovery, and CO2 storage accordingly.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Liang Huang, Wen Zhou, Hao Xu, Lu Wang, Jie Zou, Qiumei Zhou
Summary: This study conducted microscopic modeling for shale nanocomposites, revealing different gas recovery mechanisms during pressure depletion and CO2 sequestration. The study suggests CH4 adsorbed state as a potential target for enhanced shale gas recovery. Additionally, increasing water content reduces CH4 recovery during pressure depletion but improves CH4 recovery during CO2 injection.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Energy & Fuels
Wenfeng Guang, Xiaoqian Liu, Zhenyu Zhang, Peng Luo
Summary: The diffusion mechanism of CH4 and CO2 on the coal matrix is important for enhanced coal seam gas recovery and CO2 sequestration. Different-phase CO2 has different effects on gas mass transfer and surface thermodynamics in the coal matrix.
Article
Chemistry, Multidisciplinary
Peng Zhao, Lingzhi Xie, Bo He, Jun Liu
Summary: The study demonstrates the significant impact of anisotropic permeability on the behavior of free gases in shale reservoirs, with higher k values leading to increased accumulation of CO2 and enhanced CH4 recovery. Additionally, variations in k significantly influence the distribution of free gases, with gases tending to migrate along directions with higher permeability.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Chemistry, Physical
Xidong Du, Dongdong Pang, Yugang Cheng, Yuan Zhao, Zhenkun Hou, Zhenjian Liu, Tengfei Wu, Couxian Shu
Summary: Understanding the competitive adsorption behaviors of CH4, N2, and CO2 on montmorillonite is crucial for enhanced hydrocarbon recovery in clay-rich gas-shale reservoirs. CO2 showed the highest selectivity and was able to stimulate CH4 desorption. Lowering the temperature increased selectivity and facilitated desorption, while injecting favorably adsorbing gases triggered desorption more easily.
APPLIED CLAY SCIENCE
(2021)
Article
Energy & Fuels
Moataz Mansi, Mohamed Almobarak, Christopher Lagat, Quan Xie
Summary: Development of shale gas reservoirs is the fastest growing area due to potential reserves. CO2 injection into shale reservoirs initiates enhanced gas recovery and CO2 sequestration, but there are uncertainties due to heterogeneity and complexity. This study aims to provide a practical screening tool to manage and predict the efficiency of enhanced gas recovery and CO2 sequestration in shale reservoirs.
Article
Energy & Fuels
Kaiyi Zhang, Hao Jiang, Guan Qin
Summary: Water can suppress the adsorption of CO2 and CH4 when its content is high, but can enhance CO2/CH4 selectivity under certain circumstances. Kerogen shows a stronger preference for CO2 adsorption over CH4.
Article
Thermodynamics
Shifeng Tian, Junping Zhou, Xuefu Xian, Quan Gan, Kang Yang, Yi Zheng, Guangrong Deng, Fengshou Zhang
Summary: CO2 storage in shale formation is a potential means to reduce CO2 emissions and achieve carbon neutrality. The interaction between CO2 and shale leads to changes in permeability, which is crucial for CO2 sequestration. This study investigated the effect of supercritical CO2 exposure time on the porosity and permeability evolution of dry and wet shale samples. The results showed that the porosity and permeability of both dry and wet shale initially increased and then decreased with exposure time, with an inflection point. The evolution of porosity and permeability in shale is controlled by the chemical-mechanical coupling effects, with mineral dissolution and mechanical weakening playing key roles. The inflection time was earlier in wet shale, indicating a shorter period of chemical dominance compared to dry shale. These findings highlight the importance of considering time-dependent chemical-mechanical coupling effects when evaluating shale gas production and CO2 storage capacity.
Article
Chemistry, Multidisciplinary
Xidong Du, Dongdong Pang, Yuan Zhao, Zhenkun Hou, Hanglong Wang, Yugang Cheng
Summary: This study examines the adsorption characteristics of CO2, N-2, and CH4 on kaolinite clay and investigates the effects of temperature, separation coefficients, and spontaneity on the adsorption behavior.
ARABIAN JOURNAL OF CHEMISTRY
(2022)
Article
Engineering, Environmental
Sen Wang, Xinyu Yao, Qihong Feng, Farzam Javadpour, Yuxuan Yang, Qingzhong Xue, Xiaofang Li
Summary: This study investigates the competitive adsorption between CO2 and hydrocarbon components in shales, as well as the recovery mechanisms of CO2 huff-n-puff in kerogenic circular nanopores. The study reveals that different pore geometries and compositions significantly impact gas adsorption and recovery behaviors, highlighting the importance of using realistic shale kerogen models. Additionally, increasing pore size improves gas recovery during pressure drawdown but limits the effectiveness of CO2 injection, leading to an overall increase in gas recovery and CO2 sequestration efficiency.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Thermodynamics
Chao Qin, Yongdong Jiang, Junping Zhou, Shuangying Zuo, Shiwan Chen, Zhengjie Liu, Hong Yin, Ye Li
Summary: This study investigates the influence of supercritical CO2 (ScCO2) injection on the water wettability of shale. The results show that the water contact angles of shale generally increase and the wettability weakens after ScCO2 exposure. This change may have positive effects on gas seepage but negative effects on CGS stability.
Article
Physics, Multidisciplinary
Jing Yue, Jian Li, Wen Zhang, Zhangxin Chen
Summary: We propose an efficient deep learning method called coupled deep neural networks (CDNNs) for coupling the Stokes and Darcy-Forchheimer problems. Our method properly compiles the interface conditions of the coupled problems into the networks and serves as an efficient alternative to complex coupled problems. To enforce energy conservation constraints, the CDNNs use simple fully connected layers and a custom loss function for model training and physical property approximation. The method has advantages in random sampling, mesh-free implementation, and parallel computation for solving multiple variables simultaneously. Theoretical results guarantee the convergence of the loss function and the neural networks to the exact solution. Numerical experiments demonstrate the performance of the proposed method.
Article
Engineering, Chemical
Shamshad Ul Haq, Maryam Aghajamali, Hassan Hassanzadeh
Summary: We have developed a rapid anthocyanin-based paper sensor that exhibits high sensitivity and optical visibility for colorimetric detection of urea. The sensor undergoes a color change from purple to blue upon exposure to ammonia generated from urea hydrolysis. By optimizing the storage of anthocyanin, the solvent for urease, the hydrolysis time, and temperature, we have achieved exceptional sensitivity and low detection limits. The sensor shows promise for on-site urea determination in various applications.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Energy & Fuels
Liangliang Jiang, Shanshan Chen, Yanpeng Chen, Zhangxin Chen, Fenjin Sun, Xiaohu Dong, Keliu Wu
Summary: Underground coal gasification (UCG) has the prospect of tapping deep coal seams and reducing carbon emissions. However, there is limited experience in deep UCG development. This study constructed a large-scale 3D UCG model with an improved method and considered the effect of double-diffusive natural convection. The results showed that the improved method was beneficial for the development of UCG cavities in deep coal seams, and double-diffusive natural convection played an important role in cavity development and overall UCG performance.
Article
Geochemistry & Geophysics
Xiaocai Shan, Zhangxin Chen, Boye Fu, Wang Zhang, Jing Li, Keliu Wu
Summary: We introduce a novel deep spatial-sequential graph convolutional network (SSGCN) for predicting total organic carbon (TOC) by leveraging cross-log topological association features and log-specific sequential features, outperforming existing methods. In the southeast Sichuan Basin, SSGCN shows better cross-validation performance and generalizability. Our SSGCN method can predict TOC with an R-2 value of 0.87 within 1 second, increasing efficiency in obtaining TOC parameter. We recommend using graph and sequential convolutions in well-log analysis deep learning architectures.
Article
Biochemistry & Molecular Biology
Mohammadali Ahmadi, Zhangxin Chen
Summary: Using molecular dynamics (MD) simulation, the study evaluated the wettability alteration during steam injection for bitumen and heavy oil recovery. It was found that higher asphaltene content led to higher adsorption energy between bitumen/heavy oil and quartz surfaces. At elevated temperatures, the quartz surfaces became more oil-wet, while at ambient conditions, they were highly water-wet. These findings provide insights into wettability alteration during in situ thermal processes for bitumen and heavy oil recovery.
Article
Thermodynamics
Gang Hui, Zhangxin Chen, Youjing Wang, Dongmei Zhang, Fei Gu
Summary: The controlling factors of unconventional shale productivity have not been well understood and this study aims to evaluate these factors using comprehensive datasets from 1182 core samples of key wells from the Duvernay shale in Alberta. By integrating reservoir parameters and shale productivity, a machine learning-based approach is used to identify the fundamental elements affecting shale productivity. The results show that factors such as production index, formation pressure, effective porosity, total organic carbon, gas saturation, and shale thickness contribute significantly to shale productivity.
Article
Energy & Fuels
Qiyang Gou, Shang Xu, Zhangxin Chen, Zhengbin Wu
Summary: The traditional characterization of shale oil reservoir pores is based on the classification of micro, meso, and macropores in shale gas reservoirs. However, the significant difference between oil and gas molecules results in poor applicability of this classification. This study proposes a new classification method for shale oil reservoirs, based on N2 adsorption, Soxhlet extraction, and programmed pyrolysis experiments. Compared to previous methods, this new approach reveals the correlation between shale oil attributes and pore spaces for the first time, providing more accurate evaluation results and significant implications for optimizing exploration strategies.
Article
Energy & Fuels
Gang Hui, Zhangxin Chen, Jun Yan, Muming Wang, Hai Wang, Dongmei Zhang, Fei Gu
Summary: The integrated experiment logging-based strategy is proposed to evaluate high-quality shale in the West Duvernay Shale Basin. Through core measurements and logging interpretations, the geographic distribution of high-quality shales is determined. Machine learning techniques are then used to quantify the relationships between shale productivity and reservoir characteristics and predict the spatial distribution of high-quality shales. The strategy reveals that the Duvernay shale consists of four sublayers, with the D2 and D3 sublayers considered high-quality.
Article
Energy & Fuels
Bo Liao, Jintang Wang, Jinsheng Sun, Kaihe Lv, Lei Liu, Qi Wang, Ren Wang, Xindi Lv, Yudou Wang, Zhangxin Chen
Summary: Studying the synergism effect of different hydrate inhibitors on methane hydrate formation is crucial for developing new gas hydrate inhibitors and drilling and completion fluid systems.
Review
Chemistry, Physical
Heng Zhao, Jing Liu, Na Zhong, Steve Larter, Yu Li, Md Golam Kibria, Bao-Lian Su, Zhangxin Chen, Jinguang Hu
Summary: Biomass, as a promising alternative to limited fossil feedstock, has the potential for value-added chemicals and fuels. However, the low conversion efficiency and product selectivity of biomass photoreforming due to its structural complexity and unclear reaction mechanism remain challenges. Hierarchically porous photocatalysts with adjustable surface properties have shown superiority in boosting the conversion efficiency and selectivity by improving mass transfer.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Xi Cheng, Bo Liu, Heng Zhao, Hongguang Zhang, Jiu Wang, Zhangkang Li, Bei Li, Zhangxin Chen, Jinguang Hu
Summary: This study designed a catalyst with a strong interfacial effect to efficiently photorefine lignocellulosic biomass, producing hydrogen and value-added chemicals. By optimizing the interfacial effect, the catalyst achieved high photocatalytic hydrogen production in the presence of different electron donors. This research demonstrates the potential of photorefining raw biomass through the design and optimization of catalysts.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2024)
Article
Thermodynamics
Peng Deng, Zhangxin Chen, Xiaolong Peng, Jianfeng Wang, Suyang Zhu, Haoming Ma, Zhengbin Wu
Summary: This study focuses on the Dalaoba condensate underground gas storage (CUGS) in China and establishes a dynamic pseudo-component model. Results show that the dynamic pseudo-component model accurately represents the process of thermodynamic property changes during natural gas injection, and provides insights for stable and efficient natural gas storage and supply in CUGS.
Article
Thermodynamics
Weibing Tian, Keliu Wu, Yanling Gao, Jing Li, Zhangxin Chen, Wojciech Stanek
Summary: This study revealed the dynamic contact angle (DCA) effect on imbibition and its impact on enhanced oil recovery in tight reservoirs. The results showed that the DCA effect has four stages of influence on imbibition recovery with time and affects both imbibition velocity and recovery rate.
Article
Energy & Fuels
Fuhe Lin, Frank Cheng, Zhangxin Chen
Summary: Condensed water in natural gas transmission can lead to pipeline corrosion and rupture. Predicting the distribution of water film and flow characteristics is crucial for analyzing pipe elbow corrosion. In this study, a model is developed to predict water phase accumulation locations and corrosion extent. The model is validated and shows substantial agreement with previous studies. The simulation results indicate that water film is mainly distributed at the bottom, and the elbow front is more susceptible to corrosion.
GEOENERGY SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Chemical
Sayyedvahid Bamzad, Mahmood Abdi, Mabkhot BinDahbag, Mohsen Zirrahi, Jason Dickson, Hassan Hassanzadeh
Summary: Solvent-assisted heavy oil recovery methods have become increasingly significant. Experimental measurements and thermodynamic modeling show that the addition of CO2 reduces the viscosity of bitumen, and a diluent significantly affects the viscosity and density of liquid mixtures. Thermodynamic modeling accurately predicts the liquid density and solvent solubility.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
