Article
Thermodynamics
Yuhang Gu, Jiaxin Sun, Fanfan Qin, Fulong Ning, Xinxin Cao, Tianle Liu, Shunbo Qin, Ling Zhang, Guosheng Jiang
Summary: This study constructs a prediction model based on field survey data in Japan to test the feasibility of deep depressurization in an actual reservoir below the quadruple point. The impact of ice formation on gas production is discussed and a method of deep depressurization combined with underburden sealing is proposed. The results show that deep depressurization can enhance gas production effectively and underburden sealing can further improve productivity.
Article
Energy & Fuels
Peixiao Mao, Jiaxin Sun, Fulong Ning, Lin Chen, Yizhao Wan, Gaowei Hu, Nengyou Wu
Summary: The study demonstrates that in inclined hydrate reservoirs, placing a single horizontal production well in the structural low can increase gas and water production; production performance in upper sandy reservoir and middle muddy reservoir are sensitive to the layout of production wells.
Article
Astronomy & Astrophysics
M. Muraoka, J. Yoneda, Y. Jin, T. Hattori, T. Imai, K. Suzuki
Summary: This study aims to develop a thermal property estimation model for determining the thermal properties of methane hydrate (MH)-bearing sediments, as direct measurement of thermal properties of general MH reservoirs is difficult. By improving existing models and using a single-sided transient plane source method, we measured the thermal property values of pressure core samples from the Nankai Trough of Japan and estimated their thermal conductivity. The de Vries model agreement well with the measured thermal conductivity values before and after MH dissociation, while the random distribution model shows increasing discrepancy as gas saturation increases.
EARTH AND SPACE SCIENCE
(2023)
Article
Energy & Fuels
Koji Yamamoto, Takayuki Kanno, Hisanao Ouchi, Koya Akamine, Satoshi Kano, Motoyoshi Naiki, Machiko Tamaki, Satoshi Ohtsuki, Norio Tenma
Summary: The study analyzed temperature and pressure data from the production test of methane hydrates in the Nankai Trough, revealing variations in vertical profiles and behavior between two production wells. Discrepancies in petrophysical characteristics, especially permeability, were observed between the wells, likely due to water-producing layers and near-wellbore phenomena. Research is focused on identifying the causes of these issues and potential solutions.
Article
Energy & Fuels
Dongyan Han, Ziming Wang, Aiguo Xu
Summary: Fractured natural gas hydrate reservoirs can significantly impact gas production, with conducive fractures affecting water production dramatically and hydrate-filled fractures in HBLs hindering pressure dissipation and gas migration to shorten production duration and reduce gas accumulation. Additionally, randomly distributed fracture networks in the overburden may enhance gas production to some extent and lead to a fluctuated gas productive rate.
Article
Energy & Fuels
Shunsuke Sakurai, Zachary M. Aman, Tomoya Nonoue, Takuya Nagaoka, Motohiro Omori, Joel Choi, Eric F. May, Bruce W. E. Norris
Summary: This study examines the flow assurance risk of hydrate re-formation in gas hydrate production and proposes the use of low-heat transfer coefficient flexible hoses to control the risk. The research focuses on a field test conducted in Japan and provides simulations and data comparison to support the findings. The insights gained from this study will inform the design of future methane hydrate production facilities.
Article
Engineering, Chemical
Kunpeng Xue, Yu Liu, Tao Yu, Junchen Lv
Summary: This study aims to assess the effectiveness of the step-wise depressurization method for gas production from natural gas hydrates in the Nankai Trough. The simulation results showed that the step-wise depressurization method significantly increased the cumulative gas production by more than 10% and mitigated the rapid generation of gas and water production during the moment of depressurization. It is suggested that a depressurization gradient of 1 MPa and a maintenance time of 1 day should be employed.
Review
Energy & Fuels
Kangji Shi, Rupeng Wei, Xianwei Guo, Qingping Li, Xin Lv, Qi Fan, Hongsheng Dong, Lei Yang, Jiafei Zhao, Yongchen Song
Summary: Field tests for gas hydrate reservoirs have been conducted worldwide, with recent trials in the South China Sea showing promising results. Despite breakthroughs, challenges towards commercial gas production remain, including ultralow permeability, heat supply issues, and unstable gas yield fluctuations. Efforts are ongoing to understand and manipulate the gas production process effectively.
Article
Energy & Fuels
Jianchun Xu, Wei Sun, Hangyu Li, Shuxia Li
Summary: The impact of complex fractures on gas production enhancement during hydrate fracturing is investigated using the embedded discrete fracture model and numerical simulation. The main fracture connected to the wellbore is found to be the key factor influencing production in vertical well hydraulic fracturing. Secondary steering of the primary fracture and multiple fractures connected to the wellbore are also favorable for enhancing production.
Article
Thermodynamics
Lin Dong, Yanlong Li, Nengyou Wu, Yizhao Wan, Hualin Liao, Huajian Wang, Yajuan Zhang, Yunkai Ji, Gaowei Hu, Yuri Leonenko
Summary: Multi-well systems can increase productivity of natural gas hydrate (NGH) production by enlarging the drainage area. The double-well system is fundamental for understanding and formulating field strategies for extracting gas from hydrate-bearing sediments. A three-dimensional model is developed to describe double-well production characteristics and analyze well-deployment strategies. The productivity of the double-well system is significantly higher than that of a single well, and the well spacing is the key variable for the system's performance.
Article
Energy & Fuels
Man Huang, Zhirui Zhao, Dongchao Su, Lianghong Wu, Fanfan Qin, Meixia Zhang, Fulong Ning
Summary: To improve gas production in natural gas hydrate (NGH) reservoirs, a new method called radial water jet slotting and grouting (RWJSG) was proposed. A 3D gas production model based on the NGH reservoir in the South China Sea was constructed to evaluate the effectiveness of RWJSG. The results showed that RWJSG can effectively enhance gas recovery, with significant increases in hydrate dissociation efficiency, cumulative gas production, and gas to water production ratio.
Article
Geosciences, Multidisciplinary
Akihiro Hiruta, Ryo Matsumoto
Summary: The collection of microbial CH4 hydrates and methane-derived authigenic carbonates has increased around Sado Island in the Sea of Japan. This study compares the carbon isotopic composition of CaCO3 in these areas to that observed in thermogenic CH4 hydrate mounds offshore of Joetsu. The variations in carbon isotopes suggest differences in past geochemical dynamics and a possible link with deep oil and gas reservoirs.
Article
Engineering, Geological
Hua Du, Huie Chen, Qing Wang, Yonggui Luo, Fansheng Kong, Bin Shi
Summary: The mechanical properties of heterogeneous hydrate-bearing sediments have significant engineering implications. In this study, the effects of hydrate-bearing layer thickness and angle on stress-strain behavior and strength parameters were investigated. It was found that increasing layer thickness and decreasing angle resulted in decreased strain-hardening and varying failure strength.
ENGINEERING GEOLOGY
(2023)
Article
Geochemistry & Geophysics
Kehua You, Lori Summa, Peter Flemings, Manasij Santra, Yi Fang
Summary: The systematic model presented in this study links the generation, migration, phase partitioning, and accumulation of methane into a closed loop mechanism, controlled by the deposition of coarse-grained layers and the base of hydrate stability zone during sediment burial. This model helps to explore for high-concentration methane hydrate in geological systems and is important for understanding the methane budget and carbon cycle under the seafloor. The coupling of geological evolution, microbial methane generation, and gas flow by buoyancy results in concentrated hydrate deposits at structural closures, illustrating how these factors contribute to the generation of high-concentration methane hydrate.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Kevin Meazell, Peter B. Flemings
Summary: This study uses 3D seismic data to track seafloor gas mounds and their leakage points in the Terrebonne Basin, Walker Ridge block 313 of the northern Gulf of Mexico. It predicts overpressure within sand bodies and explains the accumulation and release of free gas at the base of the hydrate stability zone. The study shows how the hydrate stability zone can impact fluid expulsion and be influenced by warm, rising, saline fluids sealed by hydrate.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Thermodynamics
Yoshihiro Konno, Yoshihiro Masuda, Koya Akamine, Motoyoshi Naiki, Jiro Nagao
ENERGY CONVERSION AND MANAGEMENT
(2016)
Article
Energy & Fuels
Motoaki Iwase, Shumpei Sugiyama, Yunfeng Liang, Yoshihiro Masuda, Masato Morimoto, Toshifumi Matsuoka, Edo S. Boek, Ryo Ueda, Kazunori Nakagawa
Article
Energy & Fuels
Yoshihiro Konno, Tetsuya Fujii, Akihiko Sato, Koya Akamine, Motoyoshi Naiki, Yoshihiro Masuda, Koji Yamamoto, Jiro Nagao
Article
Chemistry, Physical
Jihui Jia, Yunfeng Lian, Takeshi Tsuji, Caetano R. Miranda, Yoshihiro Masuda, Toshifumi Matsuoka
JOURNAL OF PHYSICAL CHEMISTRY C
(2019)
Article
Engineering, Chemical
Jinrong Cao, Yunfeng Liang, Yoshihiro Masuda, Hiroaki Koga, Hiroyuki Tanaka, Kohei Tamura, Sunao Takagi, Toshifumi Matsuoka
Article
Energy & Fuels
Motoaki Iwase, Yunfeng Liang, Yoshihiro Masuda, Masato Morimoto, Toshifumi Matsuoka, Edo S. Boek, Yutaro Kaito, Kazunori Nakagawa
Article
Energy & Fuels
Hiroki Matsui, Jihui Jia, Takeshi Tsuji, Yunfeng Liang, Yoshihiro Masuda
Article
Energy & Fuels
Jo Mizuhara, Yunfeng Liang, Yoshihiro Masuda, Kazuya Kobayashi, Hiroki Iwama, Hideharu Yonebayashi
Article
Energy & Fuels
Masahiro Yasue, Yoshihiro Masuda, Yunfeng Liang
Article
Engineering, Environmental
Jiangtao Pang, Yunfeng Liang, Yoshihiro Masuda, Toshifumi Matsuoka, Yi Zhang, Ziqiu Xue
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2020)
Article
Biochemistry & Molecular Biology
Kosar Khajeh, Habib Aminfar, Yoshihiro Masuda, Mousa Mohammadpourfard
JOURNAL OF MOLECULAR MODELING
(2020)
Article
Energy & Fuels
Yoshihiro Konno, Tetsuya Fujii, Akihiko Sato, Koya Akamine, Motoyoshi Naiki, Yoshihiro Masuda, Koji Yamamoto, Jiro Nagao
Summary: Gas hydrates are considered a potential energy resource for the future, with countries like Japan and China conducting offshore production tests. Discrepancies between numerical simulations and actual production data have shown that gas production stagnation in the early stages may be caused by dynamic permeability changes induced by depressurization during gas production.
Article
Energy & Fuels
Kei Fujita, Yunfeng Liang, Jo Mizuhara, Yoshihiro Masuda, Kazuya Kobayashi, Katsumo Takabayashi, Hiroki Iwama, Hideharu Yonebayashi
Summary: We investigated the adsorption behaviors of asphaltene at the oil-water interface using molecular dynamics simulations and found that the oil solvent affects both the adsorption Gibbs free energy and the adsorption structure. The adsorption Gibbs free energy of nitrogen-containing asphaltene increases linearly with the heptane volume fraction, while asphaltene without heteroatoms prefers to be solvated in the oil phase. The study highlights the influence of oil solvent on the surface activity of asphaltenes.
Article
Energy & Fuels
Le Ngoc Son, Phan Ngoc Trung, Yoshihiro Masuda, Sumihiko Murata, Nguyen The Duc, Sunao Takagi, Ahmad Ghassemi
Summary: The simulation models of Nam-Su FBR have struggled to achieve a satisfactory history match without invoking large aquifers, but researchers have improved the match by modeling porosity reduction through compaction and aquifer size changes. The key lies in reservoir rock compressibility, which is challenging to estimate in FBRs due to difficulties in coring naturally fractured intervals. A new computer-assisted history matching method has been successfully applied to determine rock compaction coefficients and adjust aquifer sizes, providing better production forecasts compared to manual trial-and-error methods commonly used in Vietnam.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Jiangtao Pang, Yunfeng Liang, Yoshihiro Masuda, Satoshi Takeya
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2020)