Article
Thermodynamics
Kunpeng Xue, Yu Liu, Tao Yu, Lei Yang, Jiafei Zhao, Yongchen Song
Summary: An accurate description of reservoir characteristics is crucial for the precise prediction of gas production from natural gas hydrate deposits. Previous studies assumed homogeneous permeability in large-scale NGH production cases, but this work established a multi-layered heterogeneous-permeability reservoir model and analyzed gas production behavior using the TOUGH + HY-DRATE simulator. It was found that scatter distribution of hydrate and free gas occurs in this reservoir model, and reservoirs with heterogeneous permeability perform better than homogeneous ones.
Article
Energy & Fuels
Tao Lv, Jing Cai, Yalong Ding, Jie Pan, Zhaoyang Chen, Xiaosen Li
Summary: In this study, a multilayer gas hydrate reservoir model was developed to predict the long-term production performance of the Shenhu area in the South China Sea. Hydraulic fracturing technology was introduced to enhance production, and its impact on the reservoir behavior was evaluated. The results showed that pressure propagation and fluid flow severely constrained hydrate dissociation in the low-permeability reservoir. During production, a significant amount of gas production came from dissolved gas in seawater and free gas in sediments. Hydraulic fracturing promoted hydrate dissociation and increased production capacity. However, it also led to the involvement of more pore water, reducing the production efficiency of the reservoir. The combination of hydraulic fracturing and other auxiliary methods can be considered for future hydrate reservoir development.
Article
Geosciences, Multidisciplinary
Tinghui Wan, Zhanzhao Li, Yanjiang Yu, Qianyong Liang, Hongfeng Lu, Jingli Wang
Summary: The impact of the placement of horizontal well section, length, and production system on productivity of horizontal well in depressurization exploitation was analyzed using numerical simulation method. The results showed that the best performance of production capacity could be achieved when the horizontal section was placed in layer II, and the heating effect significantly improved productivity. The combination of depressurization and heating increased gas production significantly.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Thermodynamics
Hongyu Ye, Xuezhen Wu, Gaoqiang Guo, Qichao Huang, Jingyu Chen, Dayong Li
Summary: The proposal of enlarging the wellbore diameter of complex structure wells in marine NGH reservoirs can increase the contact area between the wellbore and reservoir, enhance gas recovery efficiency, and result in a significant gas production increase, especially in the short term.
Review
Biochemistry & Molecular Biology
Mar'atus Sholihah, Wu-Yang Sean
Summary: Investigations on the structures, formation mechanisms, and dissociation of gas hydrates were conducted using modern instruments and numerical analyses. The characteristics of gas hydrates are multi-phase and multi-component complexes, emphasizing the importance of comprehensive investigations. The interrelationship between parameters such as temperature, pressure, and concentration is crucial for accurate production processes and the recovery of gas hydrates.
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
Tao Yu, Guoqing Guan, Dayong Wang, Yongchen Song, Abuliti Abudula
Summary: In 2017, a successful offshore methane hydrate production test was conducted at well SHSC-4 in the Shenhu Area of the South China Sea, but the long-term gas production behavior remains unknown and further investigation is required. In this study, a multi-layered methane hydrate reservoir model was built based on the actual geological conditions at this site, and long-term simulations were conducted to predict hydrate dissociation and gas production behaviors in the reservoir, revealing that the majority of gas production originated from the free gas layer, followed by methane gas released from hydrate dissociation, while the three-phase layer contributed the least to gas recovery.
Article
Engineering, Marine
Jiaxin Sun, Fulong Ning, Tianle Liu, Yanlong Li, Hongwu Lei, Ling Zhang, Wan Cheng, Ren Wang, Xinxin Cao, Guosheng Jiang
Summary: This study analyzed the challenging issue of horizontal well drilling in unconsolidated marine hydrate sediments through numerical simulations. The results show that increasing drilling fluid density and salinity may slightly accelerate hydrate dissociation, while a significant increase in drilling fluid temperature could lead to disasters in wellbore stability.
Article
Green & Sustainable Science & Technology
Hongsheng Dong, Jiaqi Wang, Zhuoxue Xie, Bin Wang, Lunxiang Zhang, Quan Shi
Summary: This review discusses the potential applications of gas hydrates in energy and environmental fields, highlighting their advantages in gas storage, gas separation, wastewater treatment, and other areas. Challenges, limitations, and future directions for each application are also explored in the paper.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Geosciences, Multidisciplinary
Taiyi Zheng, Zhengming Yang, Xiangui Liu, Yutian Luo, Qianhua Xiao, Yapu Zhang, Xinli Zhao
Summary: Using natural gas as an energy supplementary agent and adopting Huff-N-Puff (HNP) production methods show great application potential in the development of tight oil reservoirs, effectively increasing oil production by focusing on interfacial aggregation and slippage of crude oil. During the CH4 HNP process, the selection of gas injection pressure plays a crucial role in the ultimate oil recovery, and the appropriate gas injection pressure should be chosen based on reservoir conditions to maximize benefits.
NATURAL RESOURCES RESEARCH
(2021)
Article
Energy & Fuels
Sai Kiran Burla, Bhavya Tulluru, Pinnelli S. R. Prasad
Summary: Amino acids are important additives in gas-hydrate based technology, playing a dual role as inhibitors or promoters depending on concentration. The nature of the side chain and its length are critical factors, with different amino acids affecting CO2 and CH4 hydrates differently.
Article
Energy & Fuels
Dehuan Yang, Rongtao Yan, Feng Cheng, Di Lu, Changfu Wei, Huihui Tian
Summary: The low-field NMR method was used to investigate the impact of various experimental conditions on the hydration number during methane hydrate dissociation. It was found that the NMR signal peak value of water was not affected by sediment dry density, gas pressure, and salt concentration, but was significantly influenced by temperature. A relationship among NMR signal peak value, substance content, pressure, and temperature was established to estimate the hydration number of pore hydrates. The experimental results showed that the hydration number of methane hydrates remained practically unchanged during dissociation in fine-grained sediments, and was minimally influenced by experimental conditions.
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
Energy & Fuels
Alsu Garipova, Elena Mukhina, Alexander Cheremisin, Margarita Spivakova, Anton Kasyanenko, Alexey Cheremisin
Summary: This article presents a numerical simulation of hydrocarbon gas injection into a horizontal well with multiple hydraulic fractures in the Bazhenov shale oil formation in Western Siberia. It is the first complex field-scale study of gas injection for this formation and explores the effects of different operating parameters and fracture models on oil recovery. The results show a significant increase in oil recovery, ranging from 34% to 117%, depending on the fracture model and gas injection method.
Article
Energy & Fuels
Xinxin Cao, Jiaxin Sun, Fulong Ning, Heen Zhang, Nengyou Wu, Yanjiang Yu
Summary: This study explores the influence of hydrate-free interlayers (HFIs) on gas production in NGH reservoirs in the Shenhu area. The results show that NGHs adjacent to HFIs dissociate preferentially over time, thereby increasing gas production. High-permeability HFIs act as channels that enhance pressure diffusion, fluid flow, heat transfer, and long-term gas production efficiency. In contrast, low-permeability HFIs negatively affect gas production.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2022)