Mechanical behaviors of hydrate-bearing sediment with different cementation spatial distributions at microscales

Li, Yanghui; Wu, Peng; Sun, Xiaofeng; Liu, Weiguo; Song, Yongchen

doi:10.1016/j.isci.2021.102448

Cited by 24 publications

(8 citation statements)

References 68 publications

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“…The H–S bond coordination number represents the number of individual hydrate particles bonding to sand particles and is used to characterize the area of the cemented interface between hydrate and sand particles. Therefore, the ability of hydrate particles to bear the load component is closely related to the area of the cemented interface between hydrate and sand particles . In addition, as shown in Figure , it is noteworthy that after an axial strain of 9%, the stress components borne by the individual hydrate particles decrease more for the cluster and cementing types and less for the prepatchy and patchy types.…”

Section: Resultsmentioning

confidence: 92%

“…Therefore, the ability of hydrate particles to bear the load component is closely related to the area of the cemented interface between hydrate and sand particles. 71 In addition, as shown in Figure 13, it is noteworthy that after an axial strain of 9%, the stress components borne by the individual hydrate particles decrease more for the cluster and cementing types and less for the prepatchy and patchy types. This behavior will be explained by observing the deformation of cementing and patchy type hydrates during shearing.…”

Section: Resultsmentioning

confidence: 93%

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Effect of Hydrate Distribution on the Mechanical Response of Hydrate-Bearing Sand: Discrete Element Method Simulation

You

Sun

et al. 2022

Energy Fuels

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Natural gas hydrates are cage-like crystalline solids that are globally recognized as a potential energy suitable for sustainable development. Hydrate distribution often affects the mechanical properties of hydrate-bearing sediments. The objective of this work is to investigate the underlying strengthening mechanisms of hydrate-bearing sediments under different hydrate distributions. The discrete element method is used to prepare numerical hydrate-bearing sediments and simulate biaxial compression tests. Hydrates are simulated as small cemented particles that are either randomly distributed or gathered filling the hydrate-free sediments. The simulation results show that at hydrate saturation of 45%, the sediment with randomly distributed hydrates exhibits higher peak strength, strain-softening and a run-through shear band, while the sediment with gathered hydrates shows higher residual strength and a cross-type shear band. Micromechanical exploration finds that many hydrate-related micro force chains are created to share the load component. In the sediment with a randomly distributed hydrate, a more stable force chain complex is formed, which is subjected to a smaller force concentration, improving the strength and stability of the sediment. As the hydrate particles gather in the sediment, the bonding forces become more concentrated and the hydrate can participate in the skeleton that contributes to the residual strength of the sediment.

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Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 93%

Effect of Hydrate Distribution on the Mechanical Response of Hydrate-Bearing Sand: Discrete Element Method Simulation

You

Sun

et al. 2022

Energy Fuels

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“…For the hydrate nucleation process, a certain amount of free guest molecules must be evenly distributed with the water molecules, and the free energy of the guest and water molecules should be relatively low. Only under these conditions can be the nuclei of the hydrate crystals can stabilize and continue to grow [34][35][36][37]. However, because of its very low solubility in water, R141b cannot diffuse uniformly in water molecules [19].…”

Section: Characteristics Of Hydrate Formationmentioning

confidence: 99%

Hydrates for Cold Storage: Formation Characteristics, Stability, and Promoters

Chen¹,

Han

Chen

et al. 2021

Applied Sciences

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The potential of hydrates formed from R141b (CH3CCl2F), trimethylolethane (TME), and tetra-n-butylammonium bromide/tetra-n-butylammonium chloride (TBAB/TBAC) to be used as working substances for cold storage was investigated to provide a solution for unbalanced energy grids. In this study, the characteristics of hydrate formation, crystal morphology of hydrates, and the stability of hydrate in cyclic formation under 0.1 MPa and at 5 °C were carried out. It found that the ice had a positive effect on the hydrate formation under same conditions. Upon the addition of the ice cube, the induction time of R141b, TME, and TBAB/TBAC hydrates decreased markedly, and significantly high formation rates were obtained. Under magnetic stirring, the rate at which TBAB/TBAC formed hydrates was significantly lower than that when ice was used. In microscopic experiments, it was observed that the TBAB/TBAC mixture formed hydrates with more nucleation sites and compact structures, which may increase the hydrate formation rate. In the multiple cycle formation of TBAB/TBAC hydrates, the induction time gradually decreased with the increasing number of formation cycles and finally stabilized, which indicated the potential of the TBAB/TBAC hydrates for application in cold storage owing to their good durability and short process time for heat absorption and release.

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“…Natural gas hydrate is a kind of ice-like clathrate crystal formed at low temperature and high pressure. − On the one hand, natural gas hydrate provides new energy for human development; on the other hand, it can easily cause pipeline blockage and other safety problems if it is generated in the oil and gas pipeline. The addition of surfactants as anti-agglomerants is an effective way to prevent small hydrate particles from aggregating into large particles and protect pipes from blockages. − …”

Section: Introductionmentioning

confidence: 99%

Aggregation Behavior of Asphalt on the Natural Gas Hydrate Surface with Different Surfactant Coverages

Chen

et al. 2021

J. Phys. Chem. C

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The aggregation behaviors of asphalt on the hydrate surface with different surfactant coverages were studied by molecular simulations. The molecular polarity index of asphalt (10.47 kcal/mol) is higher than that of Span 80 (8.19 kcal/mol). Asphalt is easier to occupy the binding sites between Span 80 and hydrate. Asphalt mainly depends on the π–π interaction to form aggregates. The dispersion interaction up to −114.17 kcal/mol is the main factor to maintain the asphalt aggregate stability. With the increase of surfactant coverage, the polar groups of asphalt are easier to associate with each other, promoting the formation of larger asphalt self-aggregates. The self-aggregation increases the complexity of asphalt stacking, and the proportion of edge-to-face stacking types increases from 40 to 60%. When the Span 80 molecule number reaches 12, the diffusion coefficient of asphalt is only (2.31 ± 0.5) × 10–8 cm2/s. Asphalt with low diffusivity can provide new sites for hydrate nucleation. The results are helpful to understand the aggregation mechanism of asphalt on the hydrate surface. Increasing the concentration of surfactant only is not a good solution to solve blocking-pipeline problems. We need to use surfactant reasonably and give full play to the anti-agglomerant effect of asphalt itself.

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Mechanical behaviors of hydrate-bearing sediment with different cementation spatial distributions at microscales

Cited by 24 publications

References 68 publications

Effect of Hydrate Distribution on the Mechanical Response of Hydrate-Bearing Sand: Discrete Element Method Simulation

Effect of Hydrate Distribution on the Mechanical Response of Hydrate-Bearing Sand: Discrete Element Method Simulation

Hydrates for Cold Storage: Formation Characteristics, Stability, and Promoters

Aggregation Behavior of Asphalt on the Natural Gas Hydrate Surface with Different Surfactant Coverages

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