4.7 Article

Deformation characteristics of methane hydrate-bearing clayey and sandy sediments during depressurization dissociation

Related references

Note: Only part of the references are listed.
Article Energy & Fuels

A particle-scale investigation of mechanical behavior of cemented sediment Discrete Element Method

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 Thermodynamics

Molecular dynamic simulations of methane hydrate formation between solid surfaces: Implications for methane storage

Yongji Wu et al.

Summary: This study investigates the effects of solid surface properties on methane hydrate formation using molecular dynamics simulations. The results show that surface properties can influence hydrate nucleation pathways and methane storage capacity, providing insights for developing additives that efficiently promote hydrate formation.

ENERGY (2023)

Article Thermodynamics

Compression-induced dynamic change in effective permeability of hydrate-bearing sediments during hydrate dissociation by depressurization

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.

ENERGY (2023)

Article Thermodynamics

Methane hydrate re-formation and blockage mechanism in a pore-level water-gas flow process

Huiru Sun et al.

Summary: This study analyzes the factors influencing hydrate re-formation characteristics by simulating two-phase flow in hydrate sediment. The results show that temperature and pressure exhibit three stages of change in the water-dominated two-phase flow process. A lower effective sectional velocity of water enhances the hydrate re-formation process. Meanwhile, the gas phase impedes mass transfer on the water-hydrate interface and acts as a nucleation site to promote hydrate re-formation. The onset time of flow blockage is linearly positively correlated with the effective sectional velocity of water, but the amount of hydrate re-formation decreases with increasing velocity.

ENERGY (2023)

Article Thermodynamics

Microstructure evolution and dynamic permeability anisotropy during hydrate dissociation in sediment under stress state

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.

ENERGY (2023)

Article Engineering, Environmental

Hydrate phase equilibria in natural sediments: Inhibition mechanism and NMR-based prediction method

Zheng Liu et al.

Summary: This study proposes a novel method for predicting hydrate phase equilibria in natural sediments using low-field NMR technology and clarifies its inhibition mechanism from the perspective of different types of pore water. The results show that hydrates act as solid matrices in sediments and reduce pore size, and hydrate formation from bound water is more difficult than from capillary water. The differences in dissociation temperature depression are attributed to water adsorption on the mineral surface and interlayer cation hydration. The feasibility and validity of the NMR-based method in predicting hydrate phase equilibrium condition in natural sediments are verified.

CHEMICAL ENGINEERING JOURNAL (2023)

Article Engineering, Geological

Creep behaviours of methane hydrate-bearing sediments

Yiming Zhu et al.

Summary: This study investigates the creep behaviour of sediments containing methane hydrates. The results show the existence of attenuation- and steady-creep stages during creep, with acceleration-creep stage observed under higher-temperature and higher-stress conditions. The findings suggest that confining pressure, temperature, and stress level affect the creep characteristics of the sediments.

ENVIRONMENTAL GEOTECHNICS (2022)

Article Thermodynamics

Thermodynamics analysis and temperature response mechanism during methane hydrate production by depressurization

Shuang Dong et al.

Summary: This study investigated the temperature response mechanism during methane hydrate production by depressurization. It was found that the temperature decreases with the progress of depressurization and accelerates as the hydrates start to dissociate. The pressure and temperature trajectories are parallel to the hydrate phase equilibrium line at the highest dissociation rate, forming a stationary state of hydrate dissociation.

ENERGY (2022)

Article Thermodynamics

Accelerated methane storage in clathrate hydrates using the natural tobacco

Chunxiao Li et al.

Summary: This study finds that wet tobacco samples can promote the formation of hydrates. The wet loose biomass materials provide abundant nucleation sites and accelerate the formation rate of hydrates. In addition, wet tobacco samples exhibit higher gas uptake, which can be beneficial for the application of hydrate-based technology.

ENERGY (2022)

Article Engineering, Geological

Undrained creep behavior of CO2 hydrate-bearing sand and its constitutive modeling considering the cementing effect of hydrates

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

Stress behavior of hydrate-bearing sands with changing temperature and hydrate saturation

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 Thermodynamics

Study on the multiphase heat and mass transfer mechanism in the dissociation of methane hydrate in reconstructed real-shape porous sediments

Rui Song et al.

Summary: This paper conducts pore scale modeling on the methane hydrate dissociation and transportation in the reconstructed three-dimensional models of the sediment. The heterogeneity of the porous sediments is identified as one of the key factors influencing the dissociation and transportation of the hydrate.

ENERGY (2022)

Review Energy & Fuels

Review on Carbon Dioxide Replacement of Natural Gas Hydrate: Research Progress and Perspectives

Tao Liu et al.

Summary: This paper summarizes the feasibility study of the CO2 replacement method in NGH exploitation, discusses the replacement mechanism and the research progress of improving the replacement efficiency, and identifies the existing problems.

ENERGY & FUELS (2022)

Article Thermodynamics

Molecular simulation study on the stability of methane hydrate confined in slit-shaped pores

Zhengcai Zhang et al.

Summary: This study investigates the stability of natural gas hydrates in confined space through molecular simulations, focusing on the effects of pore size and pore surface properties. The results show that the melting points of methane hydrate are controlled by the slit size, while the mineral surface has a minor effect. Additionally, the specific surface area of hydrate particles determines their stability in silica slits. Methane hydrate dissociates faster in confined space, especially in hydrophilic systems.

ENERGY (2022)

Article Engineering, Geological

Hydrate-bearing sediment of the South China Sea: Microstructure and mechanical characteristics

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, Environmental

Experimental and modeling investigations of hydrate phase equilibria in natural clayey-silty sediments

Zheng Liu et al.

Summary: A unified model was developed to predict hydrate phase equilibria in sediments by considering surface adsorption, capillary effect, and salt solution inhibitions. The maximum average error between model predictions and measured data was 3.29%.

CHEMICAL ENGINEERING JOURNAL (2022)

Article Thermodynamics

Effects of temperature gradient on methane hydrate formation and dissociation processes and sediment heat transfer characteristics

Mengru Tian et al.

Summary: This study simulated methane hydrate sediment with a temperature gradient and found that the temperature gradient affects the formation and dissociation of hydrates. The results of this study are significant for improving the efficiency of methane hydrate exploitation.

ENERGY (2022)

Review Energy & Fuels

Mechanical Characteristics of Hydrate-Bearing Sediment: A Review

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.

ENERGY & FUELS (2021)

Article Energy & Fuels

Triaxial tests on the overconsolidated methane hydrate-bearing clayey-silty sediments

Peng Wu et al.

Summary: The study investigates the influence of over consolidation on hydrate-bearing sediment, revealing that increasing over consolidation ratio weakens strain-hardening phenomenon and enhances initial elastic modulus and failure strength. Furthermore, increasing hydrate saturation also affects the sediment's properties.

JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING (2021)

Article Energy & Fuels

Strength estimation for hydrate-bearing sediments based on triaxial shearing tests

Lin Dong et al.

JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING (2020)

Article Energy & Fuels

Comparative analysis of the consolidation and shear behaviors of CH4 and CO2 hydrate-bearing silty sediments

Tingting Luo et al.

JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING (2020)

Article Geochemistry & Geophysics

Cementation Failure Behavior of Consolidated Gas Hydrate-Bearing Sand

Peng Wu et al.

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH (2020)

Article Energy & Fuels

Triaxial compression of hydrate-bearing sediments undergoing hydrate dissociation by depressurization

Jeong-Hoon Choi et al.

GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT (2020)

Article Geochemistry & Geophysics

Tetrahydrofuran Hydrate in Clayey SedimentsLaboratory Formation, Morphology, and Wave Characterization

Zhichao Liu et al.

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH (2019)

Article Energy & Fuels

Creep Behaviors of Methane Hydrate-Bearing Frozen Sediments

Yanghui Li et al.

ENERGIES (2019)

Article Geosciences, Multidisciplinary

The first offshore natural gas hydrate production test in South China Sea

Jin-fa Li et al.

CHINA GEOLOGY (2018)

Article Geochemistry & Geophysics

Influence of Fines Content on the Mechanical Behavior of Methane Hydrate-Bearing Sediments

Masayuki Hyodo et al.

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH (2017)

Article Energy & Fuels

Assessment of methane gas production from Indian gas hydrate petroleum systems

N. Vedachalam et al.

APPLIED ENERGY (2016)

Article Geosciences, Multidisciplinary

Effects of dissociation on the shear strength and deformation behavior of methane hydrate-bearing sediments

Masayuki Hyodo et al.

MARINE AND PETROLEUM GEOLOGY (2014)

Article Geosciences, Multidisciplinary

Sampling disturbance in hydrate-bearing sediment pressure cores: NGHP-01 expedition, Krishna-Godavari Basin example

Sheng Dai et al.

MARINE AND PETROLEUM GEOLOGY (2014)

Article Geosciences, Multidisciplinary

Experimental research on the mechanical properties of methane hydrate-bearing sediments during hydrate dissociation

Yongchen Song et al.

MARINE AND PETROLEUM GEOLOGY (2014)

Article Engineering, Geological

Mechanical and dissociation properties of methane hydrate-bearing sand in deep seabed

Masayuki Hyodo et al.

SOILS AND FOUNDATIONS (2013)

Article Geochemistry & Geophysics

Mechanical behavior of gas-saturated methane hydrate-bearing sediments

Masayuki Hyodo et al.

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH (2013)

Article Chemistry, Multidisciplinary

Mechanical properties of clathrate hydrates: status and perspectives

Fulong Ning et al.

ENERGY & ENVIRONMENTAL SCIENCE (2012)

Article Geosciences, Multidisciplinary

Gas hydrates in India: Potential and development

Kalachand Sain et al.

GONDWANA RESEARCH (2012)

Article Energy & Fuels

Analyses of stress strain behavior and constitutive model of artificial methane hydrate

Feng Yu et al.

JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING (2011)

Article Geosciences, Multidisciplinary

Gas Hydrates in the Qilian Mountain Permafrost, Qinghai, Northwest China

Zhu Youhai et al.

ACTA GEOLOGICA SINICA-ENGLISH EDITION (2010)

Article Geochemistry & Geophysics

Gas hydrate saturations estimated from fractured reservoir at Site NGHP-01-10, Krishna-Godavari Basin, India

M. W. Lee et al.

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH (2009)

Article Energy & Fuels

Geomechanical response of permafrost-associated hydrate deposits to depressurization-induced gas production

J. Rutqvist et al.

JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING (2009)

Article Geochemistry & Geophysics

Mechanical properties of sand, silt, and clay containing tetrahydrofuran hydrate

T. S. Yun et al.

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH (2007)

Article Energy & Fuels

Methane hydrate formation and dissociation in a partially saturated core-scale sand sample

Timothy J. Kneafsey et al.

JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING (2007)