Article
Engineering, Chemical
Vinicius De Almeida, Eric Serris, Gianluca Lavalle, Ana Cameirao, Jean-Michel Herri, Emilie Abadie, Nicolas Lesage, Annie Fidel Dufour
Summary: In this work, the mechanisms of hydrate formation and plugging in oil-water systems are proposed based on flow loop tests. Experiments were conducted at different water cuts using Kerdane oil, water (with NaCl) and natural gas. Different instruments were used to identify flow patterns and detect the phase carrying hydrates. A model based on density measurement is proposed to calculate the fraction of hydrates flowing locally, and local accumulations of hydrates were observed leading to plugging.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Energy & Fuels
K. P. Lijith, Reddi Srinivasa Rao, Devendra Narain Singh
Summary: This study investigates the synthesis of CO2 hydrates in partially saturated finesands under triaxial conditions and analyzes their elastic properties and formation and dissociation processes. The results show that the induction time for CO2 hydrate formation increases and the water-to-hydrate conversion ratio decreases with an increase in the initial water content.
Article
Energy & Fuels
O. S. Gaidukova, V. V. Dorokhov, S. Y. Misyura, V. S. Morozov, N. E. Shlegel, P. A. Strizhak
Summary: The dissociation and combustion of methane hydrate samples were experimentally studied under different thermal conditions. The synergistic effects of simultaneously dissociating methane and carbon dioxide hydrates were analyzed. It was found that ignition of methane hydrate granules was faster than tablets, and increasing the combustion chamber temperature improved the ignition performance of tablets.
Article
Energy & Fuels
Yulia F. Chirkova, Andrey S. Stoporev, Roman S. Pavelyev, Mikhail A. Varfolomeev
Summary: In recent years, interest in gas hydrates has grown due to their potential as an energy source and environmentally friendly alternative to storing and transporting natural gas. This study compared the effectiveness of sulfonated castor oil (SCO) and sodium dodecyl sulfate (SDS) as promoting reagents in the formation and decomposition of methane and methane-propane hydrates in a porous medium. The results showed that SCO significantly improved the water conversion rate in methane hydrates due to enhanced mass transfer in the presence of surfactants, while the effect on methane-propane hydrates was limited. Both SCO and SDS accelerated hydrate formation, but SCO required less supercooling. These findings suggest that SCO is comparable to SDS in promoting activity in porous media with varying water saturation.
Article
Environmental Sciences
Abdulrab Abdulwahab Almashwali, Muhammad Saad Khan, Bhajan Lal, Quah Chong Jin, Khalik M. Sabil, Siak Foo Khor
Summary: This experimental study evaluates the inhibition performance of three amino acids, namely glycine, proline, and alanine, as kinetic hydrates inhibitors (KHIs). The results show that these amino acids effectively delay the formation of methane hydrate. The findings contribute significantly to limiting gas hydrate formation in offshore pipelines.
Article
Environmental Sciences
D. V. Antonov, I. G. Donskoy, O. S. Gaidukova, S. Ya. Misyura, V. S. Morozov, G. S. Nyashina, P. A. Strizhak
Summary: The dissociation and combustion behavior of double gas hydrates in a tubular muffle furnace were studied to improve combustion efficiency and reduce gas emissions. The experiments and simulations showed that double gas hydrates have more stable combustion and their dissociation rate increases with temperature. The presence of heavy hydrocarbons in double gas hydrates reduces unburned CH4 emissions, but increases CO2 emissions. Furnace temperature and gas hydrate composition also impact anthropogenic gas emissions.
ENVIRONMENTAL RESEARCH
(2022)
Article
Thermodynamics
Xin Zhao, Qingchao Fang, Zhengsong Qiu, Shiyou Mi, Zhiyuan Wang, Qi Geng, Yubin Zhang
Summary: The research found that in oil-free gas-water systems, traditional anti-agglomerants had no effect on agglomeration, while kinetic inhibitors could slow down hydrate formation but not inhibit agglomeration. An amphiphilic amide compound DCA effectively prevented hydrate agglomeration and blockage by reducing the cohesion force between hydrate particles and changing the surface characteristics of the particles, preventing liquid bridges from forming and inhibiting adhesion and agglomeration.
Review
Green & Sustainable Science & Technology
Pengfei Wang, Ying Teng, Jinlong Zhu, Wancheng Bao, Songbai Han, Yun Li, Yusheng Zhao, Heping Xie
Summary: The synergy between metal-organic frameworks (MOFs) and gas hydrates is a potential technology for CH4 storage and CO2 separation. This review summarizes the structural characteristics of MOFs and gas hydrates and analyzes their effects on hydrate formation, thermodynamics, kinetics, and gas storage capacity. The paper also highlights the research progress and challenges associated with MOF-hydrate synergy and their impact on CH4 storage and CO2 separation.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Geochemistry & Geophysics
Xiong Zhang, Zhendong Luan, Zengfeng Du, Shichuan Xi, Lianfu Li, Chao Lian, Jianxing Zhang, Ziyu Yin, Liang Ma, Xin Zhang
Summary: This study used an integrated in-situ long-term observation platform to monitor seep venting activity and associated chemosynthetic communities in the Formosa Ridge of the South China Sea. It found that gas hydrates are formed during cold seep venting, interspersed with periods of hydrate decomposition during non-active intervals. The methane concentration and biological cover in chemosynthetic communities exhibited stability.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Abdolreza Farhadian, Andrey S. Stoporev, Mikhail A. Varfolomeev, Yulia F. Zaripova, Vladimir V. Yarkovoi, Matvei E. Semenov, Airat G. Kiiamov, Roman S. Pavelyev, Aleksandr M. Aimaletdinov, Tharaa Mohammad, Danis K. Nurgaliev
Summary: This study developed an eco-friendly biosurfactant using castor oil, which effectively promoted the formation rate of methane hydrates and showed better safety and reduced foaming properties.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Energy & Fuels
Limin Wang, Xin Zheng, Peng Xiao, Xing Huang, Bei Liu, Zhi Li, Guangjin Chen, Changyu Sun
Summary: The role of wax crystals in hydrate nucleation and growth is complex, with inhibitory effects on growth but dual effects on nucleation. The mass transfer of methane is influenced by the presence of wax crystals, whereby smaller crystals promote nucleation and larger crystals hinder mass transfer.
Article
Energy & Fuels
Dmitrii Antonov, Olga Gaidukova, Galina Nyashina, Dmitrii Razumov, Pavel Strizhak
Summary: This paper investigates the objectives and methods of improving fuel performance by adding water, and compares the combustion behaviors of slurry fuels and gas hydrates. The findings provide guidance for the rational use of water resources and the development of environmentally friendly fuels.
Article
Energy & Fuels
Alejandro Bello-Palacios, Per Fotland, Stian Almenningen, Geir Ersland
Summary: This study investigates the challenges and limitations of measuring and modeling gas relative permeability in hydrate bearing sandstone, using a combination of experiments and numerical simulations. Results indicate complexities in comparing experimental and simulated permeability in hydrate-bearing systems, with early hydrate growth potentially limiting mass transfer and affecting gas flow. Heterogeneous distribution of hydrates is shown to impact intrinsic permeability, gas relative permeability, and capillary entry pressure in the core, providing insight into hydrate induced flow restrictions and their effects on experimental results.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Jing Li, Yumei Nong, Suhong Yin, Zheng Chen, Tao Su, Qijun Yu
Summary: The effect of an alkaline environment on the structure of synthetic calcium and magnesium silicate hydrates was explored in this study. It was found that both C-S-H and M-S-H were formed when Ca2+, Mg2+, and [SiO4]4- coexisted in a sodium hydroxide solution. The presence of sodium hydroxide and low polymerization degree of silica tetrahedron in sodium silicate solution reduced the silicate chain length or Q(3)/Q(2) ratio of the synthetic products. The DFT results showed that the presence of calcium broke the Mg-O bond and weakened the charge transfer between Mg and O in the [SiO4]-Mg system.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Energy & Fuels
Lihao Liu, Bohui Shi, Shangfei Song, Yuchuan Chen, Xinhao Luo, Shijia Zhang, Huirong Huang, Haiyuan Yao, Guangjin Chen, Jing Gong
Summary: The study focuses on the flow assurance of natural gas hydrates, paying attention to the co-deposition mechanism of Micron-sized Sand Particles and natural gas hydrate particles during pipeline transportation. Horizontal high-pressure flow loop experiments are conducted to understand the hydrates and MSPs slurry flow law and co-deposition mechanism. The findings reveal the stages of the hydrate-MSPs co-deposition process in the salt-sand coexistence system and provide insights into the solid deposition process. The influence of sand particle concentration and initial flow velocity on the co-deposition process is explored, and the interaction between particles in the deposition process is revealed by Particle Vision and Measurement.