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Article
Chemistry, Physical
Bingbing Chen et al.
Summary: In this study, a new method of hydrate dissociation using seawater and electrostatic fields cooperatively (SE method) was proposed. Molecular dynamics simulations were used to investigate the thermodynamic properties and structural changes of methane hydrate in multiple salt solutions under an electrostatic field. The results showed that the electric field can drive cations into the hydrate phase, accelerating hydrate dissociation.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Energy & Fuels
Yanghui Li et al.
Summary: Natural gas hydrate is a clean energy source with high density and considerable reserves. This study focuses on the mechanical behavior of cemented hydrate-bearing sediments and reveals the effect of cementation on their properties. Through numerical simulation tests, it is found that cementation improves the strength and stiffness of the sediments, while the presence of hydrates mainly enhances stiffness. The particle-scale investigation shows that increasing confining pressure and hydrate cementation limit slip and rearrangement of sand particles, leading to strengthened strength. Shear band formation is related to cementation failure.
GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT
(2023)
Article
Energy & Fuels
Lei Yang et al.
Summary: The unique behavior of gas hydrate formation, characterized by anisotropic growth and thermotactic behavior, was identified. By regulating temperature and heat transfer scheme, one can control the morphology and behavior of hydrate formation, which is important for the application of hydrate-based techniques.
Article
Thermodynamics
Fanbao Cheng et al.
Summary: Methane hydrate, also known as flammable ice, is a clean energy source that has gained global attention as an alternative to traditional fossil fuels. The effective permeability, which is influenced by hydrate saturation and porosity changes, plays a crucial role in determining the gas production rate. This study conducted experiments to measure the effective permeability of hydrate-bearing sediments with varying hydrate saturation. The results showed that the effective permeability decreased with increasing hydrate saturation and effective stress. A formula was proposed to estimate the change in effective permeability during hydrate dissociation, and it was integrated into a thermal-hydraulic model to predict gas production under effective stress. The study provided valuable insights into compression-induced changes in effective permeability and gas/water production during hydrate dissociation.
Article
Thermodynamics
Peng Wu et al.
Summary: In this study, depressurizing dissociation was conducted on a hydrate-bearing sandy specimen using X-ray CT under triaxial stress. The results show that hydrate dissociation starts from the hydrate-gas interface and then results in the formation of cavities among patchy clusters. As the hydrate particle dissociates to a smaller size, the dissociated water gathers on the surface of the hydrate, preventing contact between the hydrate and gas phases. Subsidence is observed even at a low isotropic stress of 1 MPa after hydrate dissociation. Furthermore, the pore system characteristics vary with decreasing hydrate saturation, and the permeability of the hydrate-bearing sediment increases exponentially with decreasing hydrate saturation and is anisotropic due to the inhomogeneity of hydrate dissociation, which can be predicted via electrical conductivity.
Article
Energy & Fuels
Zhaoran Wu et al.
Summary: The study investigated the effects of hydrate saturation, hydrate decomposition, effective stress, and particle type on gas permeability and sample deformation of montmorillonite samples and quartz-montmorillonite mixtures. The results showed that gas phase permeability increased with hydrate formation. The decline of sample porosity was found to be the main factor influencing the permeability failure rate under effective stress. Furthermore, the addition of sand particles significantly affected the compressibility of sediments. Overall, the content of clay and the particle size were key factors in determining the permeability damage rate during decomposition of methane hydrate, and the addition of quartz sand reduced this damage.
Article
Thermodynamics
Haijun Wang et al.
Summary: Accurate understanding of fluid flow patterns in hydrate-bearing sediments is crucial for economic exploitation. This study investigates the effects of hydrate saturation, effective stress, pore pressure, and osmotic pressure on gas flow patterns. The results show that as hydrate saturation increases, gas flow transitions from viscous flow to slip flow, with the slippage effect becoming more pronounced. Effective stress affects gas permeability's sensitivity to osmotic pressure changes, particularly at lower hydrate saturation. Pore pressure has a minimal impact on gas permeability and flow pattern, while reducing osmotic pressure weakens the slippage effect. Finally, a semi-empirical permeability model is developed based on experimental data.
Article
Thermodynamics
Yanghui Li et al.
Summary: Natural gas hydrate, as a promising new energy, has attracted wide attention in the past decades. Experimental efforts have been made to explore the mechanical characteristics of hydrate-bearing clayey sediment under stable conditions, but few studies focus on its creep characteristics during the dissociation process. This study presents triaxial creep test results of methane hydrate-bearing clayey sediment using the depressurization dissociation method, with methane hydrate-bearing sandy sediments added for comparison. The results show that depressurization has little effect on axial strain but increases volumetric strain and reduces equivalent Poisson's ratio.
Article
Engineering, Geological
Lei Wang et al.
Summary: This paper investigates the mechanical behaviors of gas-hydrate-bearing sediments under different hydrate saturations and effective confining pressures. The results show that strength and stiffness increase with increasing hydrate saturation under the same effective confining pressure, and the effective confining pressure enhances the strength and stiffness at nearly the same hydrate saturation. Furthermore, the analysis of the Mohr circles and failure envelopes reveals that cohesion and internal friction angle increase with an increase in hydrate saturation.
ENVIRONMENTAL GEOTECHNICS
(2022)
Article
Engineering, Geological
Masaki Yoshimoto et al.
Summary: A study was conducted to investigate the time-dependent properties of CO2 hydrate-bearing sediments using undrained triaxial creep tests. The experiments and modeling revealed that CO2 hydrate-bearing sand specimens exhibited accelerated creep behavior, regardless of hydrate saturation. The elasto-viscoplastic constitutive model considering the cementing effect of hydrates successfully reproduced the undrained creep behavior under relatively high stress levels.
SOILS AND FOUNDATIONS
(2022)
Article
Energy & Fuels
Shi Shen et al.
Summary: Understanding the mechanical properties of natural gas hydrate (NGH) is crucial for its safe commercial exploitation. This study conducted mechanical experiments on NGH-bearing samples under different temperature and saturation conditions. The results revealed a positive correlation between sample strength and saturation, while temperature showed a negative correlation. Additionally, temperature and saturation exhibited a coupling effect on the samples' dilatancy and stress-strain behaviors.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2022)
Article
Geosciences, Multidisciplinary
Jing Liao et al.
Summary: In this study, seismic data interpretation and impedance inversion were conducted to delineate the spatial distribution of high saturation gas hydrate reservoirs in the low-angle subduction areas of the Makran Accretionary Prism. The characteristics of high saturation gas hydrate reservoirs in the Nankai Trough in Japan and the Shenhu Area in the South China Sea were comprehensively analyzed. The results provide useful information for the exploration and development of gas hydrate in this area.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Energy & Fuels
Rupeng Wei et al.
Summary: Recent field tests in Japan and China have attracted worldwide attention to marine gas hydrate reservoirs. To improve economic efficiency, a new scheme is proposed to jointly produce gases from the hydrate layer and its underlying shallow gas layer. The use of dual horizontal wells can significantly increase cumulative gas yield compared to a single vertical well scenario. However, there is a potential risk of interlayer failure due to pressure differences, which can be mitigated by controlling the depressurization scheme in different layers. An analysis shows promising positive energy harvest and suggests its potential application in field tests in the South China Sea without disturbing reservoir stability.
Article
Engineering, Geological
Peng Wu et al.
Summary: The mechanical characteristics of clayey-silty sediments in the South China Sea, which are reservoirs for offshore hydrate production, were comprehensively investigated in this study. Both micro and macro analyses were conducted, revealing the distribution and morphology of hydrates and obtaining important input parameters for the development of constitutive models and numerical simulations. The findings also indicated differences between the South China Sea sediments and the hydrate reservoir in the Krishna-Godavari Basin.
ENGINEERING GEOLOGY
(2022)
Article
Engineering, Geological
Lei Wang et al.
Summary: Research has shown that in fine-grained sediments in the South China Sea, the failure strength of methane hydrate-bearing sediments increases with the increase in hydrate saturation and initial effective mean stress. Additionally, the excess pore-water pressure of methane hydrate-bearing sediments remains positive during shear. It is observed that as the hydrate saturation increases, cohesion in the Mohr-Coulomb model increases while the internal friction angle has little dependence on the hydrate saturation.
CANADIAN GEOTECHNICAL JOURNAL
(2021)
Review
Energy & Fuels
Peng Wu et al.
Summary: This review comprehensively summarizes recent mechanical studies on hydrate-bearing sediment (HBS), clarifies the influences of several important parameters on the mechanical behavior of HBS, discusses corresponding particle-level mechanisms, and investigates the influences of hydrate exploitation techniques on the strength and deformation behavior of HBS. The proposed relationships and mechanisms provide insightful guidance for understanding the mechanical behavior of HBS and developing models for predicting the structural evolution of HBS during NGH exploration and exploitation.
Article
Engineering, Geological
Zhichao Liu et al.
Summary: Understanding the dynamic mechanical properties of hydrate reservoirs is crucial for safe and economic production. The damping ratio increases with hydrate content, aiding in identification. Stress and hydrate enhance modulus, but high saturation dampens stress effects.
ENGINEERING GEOLOGY
(2021)
Article
Engineering, Geological
Yanlong Li et al.
Summary: The study conducted experiments to analyze the mechanical properties of hydrate-bearing sediments with horizontally distributed hydrates, revealing that the behavior of sediment during shearing is mainly determined by the lower hydrate-saturated sub-layer.
ENGINEERING GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Jun Yoneda et al.
Summary: The article discusses the results of experiments and analyses conducted on gas hydrate-bearing sediments recovered from a stratigraphic test well in the western part of the Prudhoe Bay Unit, Alaska North Slope. The experiments showed that the hydrates formed with thermogenic and microbial mixed gases, and that low strengthening and high permeability were observed in sediments with high hydrate saturation. The results also indicated minimal changes in porosity and permeability during tests due to the low-clay content and low compressibility of the quartz sand grains in the recovered cores.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Energy & Fuels
Wenpeng Liang et al.
Summary: This study presents experimental results on phase equilibrium conditions for hydrate-bearing soils under different initial water contents, salt amounts, and pressures. A theoretical model is developed to describe the relationship among pressure, temperature, and unhydrated water content for these soils, and the experimental results validate the model's effectiveness. The new model predicts a one-to-one relationship between liquid water content and temperature shift, guiding the prediction of dissociate curves under various experimental conditions.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2021)
Article
Thermodynamics
Chuanxiao Cheng et al.
Summary: Research on the memory effect in hydrate reformation shows that depressurization leads to a weakening of the memory effect, except for an anomalous enhancement observed at extremely low backpressure. Depressurization not only alters the memory effect, but also increases the stable interval and supercooling degree of the memory effect.
Article
Thermodynamics
Yongchao Zhang et al.
Summary: This study measured and described the evolution of RSAH during methane hydrate dissociation using CT images, and proposed a fractal method to predict the relationship between RSAH and hydrate saturation. Simulation results showed that different RSAH predictions significantly influenced the hydrate production process, with the fractal model predicting lower gas production rates compared to Yousif's model.
Article
Engineering, Geological
Lin Tan et al.
Summary: This study investigates the geomechanical stability of gently sloping reservoir of oceanic hydrates induced by gas production using the huff-puff method. The production-induced slope failure is likely to occur due to overpressure caused by thermal stimulation during the huff stage and strength reduction from hydrate dissociation. Proper modeling of geological structures is crucial in reservoir simulations to impact production effectiveness and geomechanical response of the reservoir.
ENGINEERING GEOLOGY
(2021)
Article
Engineering, Geological
Fang Liu et al.
ENGINEERING GEOLOGY
(2020)
Article
Geosciences, Multidisciplinary
Liang Lei et al.
GEOPHYSICAL RESEARCH LETTERS
(2020)
Article
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Lin Dong et al.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2020)
Article
Geochemistry & Geophysics
Peng Wu et al.
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(2020)
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(2020)
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Xuan Kou et al.
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Jeffrey A. Priest et al.
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Xiang Sun et al.
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(2019)
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(2018)
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(2018)
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Jing-Chun Feng et al.
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