Review
Energy & Fuels
Phakamile Ndlovu, Saeideh Babaee, Paramespri Naidoo
Summary: This article reviews the encapsulation process of carbon dioxide by replacing methane from natural gas hydrates, presenting and discussing methane-carbon dioxide replacement models. The variables affecting the replacement process and reported theoretical findings are reviewed, along with the challenges and limitations. The fundamentals of hydrate formation mechanisms on porous media are also detailed, and a comprehensive discussion and comparison of experimental studies involving different porous media materials and various additives are presented.
Article
Engineering, Environmental
Yu-Hsuan Ho, Yau Zu Khoo, Yan-Ping Chen, Ryo Ohmura, Li-Jen Chen
Summary: This study investigates the thermodynamic and kinetic influence of polyethylenimine (PEI) on the formation of methane and carbon dioxide hydrates. It is found that PEI acts as a thermodynamic inhibitor, inhibiting the formation of hydrates. However, it has different effects on methane and carbon dioxide hydrates kinetically, inhibiting methane hydrate formation and promoting carbon dioxide hydrate formation.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Yingfei Wang, Bo Dong, Ping Wang, Lunxiang Zhang, Cong Chen, Yan Qin, Yang Liu, Weizhong Li, Yongchen Song
Summary: This study develops a model to investigate the effects of initial water on CO2-CH4 dynamic replacement in a hydrate in a pore network, and validates the model with a previous experiment. The results show that the presence of initial water leads to a faster carbon dioxide displacement, weaker methane hydrate dissociation, more pure carbon dioxide hydrate formation, similar mixed hydrate generation, and a lower exchange rate. The exchange reaction starts at the edges of hydrate distribution areas and progresses towards the inside.
Article
Energy & Fuels
Lanyun Wang, Yuan Yang, Yan Wang, Yongliang Xu, Yao Li, Jianping Wei, Xiaodong Feng, Kun Zhang
Summary: The slow formation rate and low storage capacity of gas hydrates, as well as the harsh conditions and contaminating promoters, pose major challenges to the application of carbon capture and storage (CCS) technology based on hydrate formation. In this study, three types of graphene nanoparticles (nonfunctionalized graphene, graphene oxide, and amino graphene) were tested as additives to accelerate CO2 and CH4 hydrate formation. The results showed that nonfunctionalized graphene promoted the thermodynamics of CO2 hydrate formation, while graphene oxide and amino graphene had no effect or even inhibited the formation. However, graphene oxide and amino graphene effectively enhanced gas consumption. Overall, nonfunctionalized graphene shortened the induction time, while graphene oxide and amino graphene showed potential as additives to improve gas consumption. The presence of oxidized and amine groups was found to inhibit gas hydrate nucleation.
Article
Energy & Fuels
Dongze Li, Lei Chen, Gang Liu, Jingfeng Xiao, Bingfan Li, Wenguang Yu
Summary: The NH3 replacement method shows potential advantages in enhancing the efficiency of natural gas hydrate exploitation, promoting the diffusion of methane molecules effectively, and outperforming CO2 replacement under certain conditions.
Article
Energy & Fuels
Jyoti Shanker Pandey, Orjan Strand, Nicolas von Solms, Stian Almenningen, Geir Ersland
Summary: Currently, there is a lack of visualization studies on fluid migration and hydrate rearrangement during CO2 injection into CH4 hydrates. This experimental study provides the first pore-level visualization of gas-saturated CH4 hydrates when liquid CO2 is injected, revealing the impacts of CO2 injection on the morphology evolution of CH4 hydrates and its importance for improving CH4 gas recovery without losing hydrate mass.
Article
Engineering, Chemical
Alberto Maria Gambelli, Andrea Di Schino, Federico Rossi
Summary: Through experiments, it was found that Cu particles were able to promote methane hydrates and inhibit carbon dioxide hydrates in additive manufacturing, with the effect depending on the particle concentration and chemical properties. The results were validated by comparing them with the literature.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Engineering, Chemical
Zucheng Cheng, Weiguo Liu, Shaohua Li, Sijia Wang, Yingying Liu, Xiang Sun, Cong Chen, Lanlan Jiang, Yongchen Song
Summary: This study evaluated the performance of SDS in the separation efficiency of simulated biogas. The experimental results showed that higher driving forces led to a significant increase in gas capture, dominated by the CH4 component. Hydrate growth mainly occurred in the liquid phase, and the separation factor was positively correlated with the induction time. Gas capture per unit volume of solution could be improved at higher gas-liquid ratios, while high-pressure failure behavior was observed. The defoamer had no significant effect on hydrate generation kinetics and separation efficiency.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Energy & Fuels
Erfan Khanmohammadian, Mohsen Mohammadi, Rohallah Hashemi, Sina Eslami, Mohammad Reza Ehsani
Summary: In this study, the separation of CO2 gas from a CO2/CH4 mixture was investigated using the gas hydrate formation method. Silica and APTES surface-modified silica nanoparticles with potassium hydroxide were used as additives. The presence of silica improved gas consumption, separation factor, and recovery factor. The optimal nanofluids with silica and potassium hydroxide showed a significant increase in gas consumption, separation factor, and recovery factor compared to pure water. The gas-liquid ratio and initial pressure affected the gas consumption, separation, and recovery factors.
Article
Engineering, Environmental
Yan Xie, Yu-Jie Zhu, Tao Zheng, Qing Yuan, Chang-Yu Sun, Lan-Ying Yang, Guang-Jin Chen
Summary: Utilizing multi-defective ice to construct porous CO2 hydrate can improve the efficiency of CH4-CO2 hydrate replacement, providing a new method for CH4 recovery and CO2 sequestration. Experimental results showed that the replacement efficiency at 272.15 K was significantly higher than at 268.15 K, confirming the feasibility of the replacement concept.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Tian Wang, Lunxiang Zhang, Lingjie Sun, Ran Zhou, Bo Dong, Lei Yang, Yanghui Li, Jiafei Zhao, Yongchen Song
Summary: This study explored the characteristics of CH4/CO2 replacement in fine marine sediments, with pressure and temperature identified as the main controlling factors. The content of initial methane hydrate and water in reservoir was found to have a more significant effect on CO2 storage than CH4 recovery. The unique properties of fine marine sediments, including small grain size, clay swelling, and high proportion of bound water, inhibited gas exchange kinetics and CO2 diffusion in the replacement process.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Mengya Niu, Yuanxin Yao, Zhenyuan Yin, Kai Liu, Peiming Bian, Mucong Zi, Daoyi Chen
Summary: Combining CH4 recovery with CO2 storage in marine natural gas hydrate (NGH) reservoirs is a promising carbon-neutral technology. The study found that reducing bottom hole pressure (BHP) can increase CH4 recovery ratio and CH4 production rate. Mix-H formation starts in the upper section and propagates downward after CO2/N2 injection. The use of a horizontal wellbore (HW) facilitates a more even distribution of CO2/N2, resulting in a higher CO2 composition in Mix-H.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Lingjie Sun, Tian Wang, Bo Dong, Man Li, Lei Yang, Hongsheng Dong, Lunxiang Zhang, Jiafei Zhao, Yongchen Song
Summary: A method utilizing pressure oscillation during CH4/CO2 replacement is proposed in this study, which effectively promotes the replacement process by breaking the balance of the hydrate layer and forming a CO2/CH4 mixed hydrate layer. This newly proposed method significantly enhances the recovery of CH4 and the efficiency of CO2 sequestration.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Energy & Fuels
Yingmei Wang, Aili Niu, Wenze Jiao, Ji Chen, Peng Zhang, Jinping Li
Summary: Carbon dioxide hydrate formation rate is improved by using different accelerator systems. The combination of nanographite-TBAB and SDS-TBAB shows better performance in reducing the nucleation time. TBAB shows the best nucleation amount, formation rate, and conversion rate among the single acceleration systems.
Article
Green & Sustainable Science & Technology
Hailong Tian, Zimeng Yu, Tianfu Xu, Ting Xiao, Songhua Shang
Summary: This study developed a simulator to evaluate the potential of CH4 recovery by injecting CO2 mixture into a hydrate-bearing reservoir. The results suggest that by performing similar operational procedures, high recovery efficiency of CH4 and storage ratio of CO2 can be achieved. Sensitivity analysis also showed that decreasing the concentration of CO2 in the mixtures can improve the recovery efficiency of CH4, but simultaneously reduce the storage ratio of CO2.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Energy & Fuels
Juan He, Xiaosen Li, Zhaoyang Chen, Qingping Li, Yu Zhang, Yi Wang, Zhiming Xia, Changyu You
Summary: The study found that initiating electrical heating before depressurization and performing soaking at a pressure below equilibrium can increase hydrate dissociation rate and improve energy efficiency. Additionally, not using electrical heating during depressurization can significantly reduce water production rate and increase energy efficiency. The results suggest that careful consideration of the timing and conditions of electrical heating can optimize hydrate dissociation and energy use in hydrate exploitation.
Article
Energy & Fuels
Chun-Gang Xu, Min Wang, Gang Xu, Xiao-Sen Li, Wei Zhang, Jing Cai, Zhao-Yang Chen
Summary: Research demonstrates that CO2-CP binary hydrate and CO2 hydrate are formed successively and coexist in the final hydrate in the CP-CO2 system. The formation of these two hydrates causes two pressure drops.
Article
Energy & Fuels
Xuan Kou, Xiao-Sen Li, Yi Wang, Kun Wan, Zhao-Yang Chen
Summary: The study analyzed the effects of particle size and hydrate saturation on hydrate growth habits, pore structure properties, and permeability reduction through microscale experiments and pore-network models. The results showed the evolution of gas hydrate pore-habit and its distribution in pores, highlighting the importance of pore interconnectivity in hydrate-bearing sediments. The study also proposed an equation for absolute permeability in the presence of gas hydrate, validated by experimental results.
Article
Energy & Fuels
Ke-Feng Yan, Hao Chen, Zhao-Yang Chen, Xiao-Sen Li, Chun-Gang Xu, Yu Zhang, Zhi-Ming Xia, Yi-Song Yu
Summary: This study investigates the impact of H2O on CH4-CO2 displacement behavior using molecular dynamics simulation and quantum mechanics calculation. It reveals that the electrostatic interaction of H2O-H2O and H2O-gas is a key factor in the CH4-CO2 replacement mechanism, suggesting that modifying the electrostatic interaction with H2O molecules could enhance the replacement efficiency.
Article
Thermodynamics
Juan He, Xiaosen Li, Zhaoyang Chen, Changyu You, Kefeng Yan, Zhiming Xia, Qingping Li
Summary: The distribution of hydrates in sediment affects the changing trends of effective thermal conductivity, especially influenced by gas saturation, water saturation or pressure. Different formation processes of hydrates exhibit various trends in thermal conductivity changes, with non-uniform distribution causing different behaviors.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Energy & Fuels
Hao Chen, Ke-Feng Yan, Zhao-Yang Chen, Xiao-Sen Li, Yu Zhang, Chun-Gang Xu
Summary: This study systematically investigated the characteristics of host-guest interactions in gas hydrates using quantum mechanics calculations. It highlighted the significant impact of electrostatic interactions on stability, with molecules with higher maximum ESP values showing higher stabilization. The findings suggest that van der Waals volumes/surface areas and V-s,V-max values of guest molecules are key factors for gas hydrate stability.
Article
Energy & Fuels
Yu Zhang, Lei Zhang, Chuan-Yu Zhu, Li-Xin Xu, Xiao-Sen Li, Zhao-Yang Chen
Summary: The formation rates of methane hydrate are significantly affected by the grain size of the sediments, with lower rates observed in sand compared to powders. The final water conversion rate is similar in powders and can reach nearly 100% with sufficient gas supply, while the rate declines sharply at a certain water conversion point in all three types of porous media.
Article
Energy & Fuels
Lei Zhang, Yu Zhang, Chang Chen, Xiao-Sen Li, Zhao-Yang Chen
Summary: A two-dimensional numerical model was established on the hydrate reservoir at station W17, Shenhu area of the South China Sea to study the response of the reservoir to drilling fluid temperature and salinity values. Results showed that temperature and pressure changes during drilling process promoted hydrate decomposition, leading to secondary hydrate formation. Increasing drilling fluid temperature significantly enhanced hydrate decomposition and pressure increase near the wellbore, potentially causing pore fluid flow into the wellbore.
Article
Physics, Multidisciplinary
Haopeng Zeng, Yu Zhang, Lei Zhang, Zhaoyang Chen, Xiaosen Li
Summary: Depressurization combined with brine injection is a potential method for improving the production efficiency of natural gas hydrate fields and avoiding secondary formation of hydrate. The experimental results show that high-water production reduces the final gas recovery, while increasing NaCl concentration only effectively promotes gas production rate in the early stage. The injection of NaCl solution decreases the lowest temperature in sediments during hydrate production and increases heat transfer.
Article
Physics, Multidisciplinary
Zhiwen Zhang, Xiaosen Li, Zhaoyang Chen, Yu Zhang, Hao Peng
Summary: In this study, the electrical resistivity properties of gas-water-sand fluid were experimentally investigated. The effects of various factors on the resistivity of the multiphase fluid were studied, and the measurement devices and operating parameters were optimized. A novel combined resistivity method was developed, which showed promising results for measuring the phase fractions of gas-water-sand fluid.
Article
Engineering, Marine
Haopeng Zeng, Yu Zhang, Lei Zhang, Zhaoyang Chen, Xiaosen Li
Summary: The presence of salts and sea mud affects the formation of natural gas hydrates (NGH). Low NaCl concentration and low montmorillonite content can reduce the induction time of hydrate formation, while high NaCl concentration and high montmorillonite content significantly increase the induction time. The increase in NaCl concentration enhances the inhibition of hydrate formation and reduces the final water conversion.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Review
Energy & Fuels
Hao Peng, Xiaosen Li, Zhaoyang Chen, Yu Zhang, Changyu You
Summary: This paper focuses on the seepage studies of hydrate-bearing sediment (HBS), including the application of theories, normalized permeability models, extension with new technology, and development. There is currently no review that has predicted the original permeability of sediments without hydrates, and there are limited studies on seepage theories using new technologies. However, this review summarizes the prospects, evolution, and application of HBS seepage theories from the perspectives of experiments, numerical simulation, and microscopic visualization, and discusses the current limitations and directions of these theories.
Article
Energy & Fuels
Hongfei Ji, Xiao-Sen Li, Zhaoyang Chen, Changyu You, Hao Peng, Yun Feng
Summary: This study employs an improved multiple-point geostatistics simulation method to generate a series of images of porous media that accurately reproduce the distribution of hydrates in sediments. The algorithm successfully solves the problem of hydrate blockage and ensures similarity in variogram and visual properties with the training image. The feasibility of predicting the pore habit of hydrates with time using this novel method is proven by a verification case. This research offers a new approach to predict hydrate distribution behavior and the algorithm may be widely applied by scanning training images from different reservoirs.
Article
Energy & Fuels
Hao-Yang Li, Xiao-Sen Li, Yi-Song Yu, Zhao-Yang Chen
Summary: In this study, the morphologies of methane hydrate formation in a system containing different mole ratios of tetrahydrofuran (THF) and cyclopentane (CP) at two different temperatures were systematically studied. The results showed that a hydrate film quickly formed at the interface between CP and the THF solution phase, significantly decreasing gas-liquid mass transfer efficiency. Interestingly, the hydrate layer broke when the temperature increased. Three stages of hydrate formation were observed in the system at the higher temperature. Furthermore, the type of promoters used in the system had no effect on CH4 occupancy in sII cages after the hydrate layer ruptured.
Article
Energy & Fuels
Hao Peng, Xiaosen Li, Zhaoyang Chen, Yu Zhang, Hongfei Ji, Changyu You
Summary: This research reveals the evolution of growth modes in hydrates by analyzing the competition parameter and saturation, providing a new approach for industrial exploitation and simulation calculation.
GAS SCIENCE AND ENGINEERING
(2023)