Analyzing the effects of inhomogeneity on the permeability of porous media containing methane hydrates through pore network models combined with CT observation

Yang, Lei; Ai, Li; Ke-min, Xue; Ling, Zheng; Li, Yanghui

doi:10.1016/j.energy.2018.08.100

Cited by 128 publications

(44 citation statements)

References 48 publications

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“…To describe the stress‐strain behavior of hydrate‐bearing sediment, several constitutive models have been proposed, such as nonlinear elastic Duncan‐Chang models (Miyazaki et al, ; Yan et al, ; Yu et al, ) and critical state model (Uchida et al, ). Meanwhile, numerical simulations have been conducted from different scales, such as sample scales (Jiang et al, ; Katagiri et al, ; Yang et al, ) and field scales (Sun et al, ; Sun et al, ). These studies have increased our understanding of the stability of gas hydrate‐bearing layers over the past decades.…”

Section: Introductionmentioning

confidence: 99%

Cementation Failure Behavior of Consolidated Gas Hydrate‐Bearing Sand

Liu

et al. 2020

JGR Solid Earth

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100

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The macromechanical properties (strength, stiffness, stress-strain relationship, etc) of the hydrate-bearing sediment are often correlated with the hydrate cementation failure behavior. In this study, a consolidated drained triaxial shear test with X-ray computed tomography was conducted on a hydrate-bearing sediment with a hydrate saturation of 32.1% under 3 MPa effective confining pressure for revealing the cementation failure behavior. The hydrate occurrences were clearly identified to be cementing, grain-coating, prepatchy cluster and patchy cluster. The cementation failure behavior (morphology), deformation evolution (quantitative statistics), and localized shear deformation at different regions of stress-strain curve were observed and analyzed using computed tomography. In the linearity region, the hydrate-cemented clusters moved as a whole, while small hydrate particles would aggregate to the periphery of the clusters. The noncemented sand particles move disorderly during this process. Localized deformation occurred perfectly exhibit an antisymmetric bifurcation pattern. In the plasticity region, the specimen starts to deform plastically; an internal shear band occurs in the specimen. The hydrates begin to shed from the periphery of the cemented structure, and the grinding effect of hydrates begins to occur between sand particles. However, the shedded hydrates will not enter and fill the neighboring pores but hind the movement of sand particles structurally near the original position. In the yielding region, the hydrate-cemented cluster structure is completely damaged and crushed into small pieces; a shear band with a determined thickness and inclination angle was observed.

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Section: Introductionmentioning

confidence: 99%

Cementation Failure Behavior of Consolidated Gas Hydrate‐Bearing Sand

Liu

et al. 2020

JGR Solid Earth

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100

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“…Luo et al () found that the heterogeneous distribution of hydrate leads to a considerable measurement error for the compressional wave velocity of the hydrate‐bearing sediment samples. The heterogeneous hydrate formation could have significant impacts on the permeability properties of hydrate‐bearing porous media (Yang et al, ).…”

Section: Introductionmentioning

confidence: 99%

Study on the Effects of Heterogeneous Distribution of Methane Hydrate on Permeability of Porous Media Using Low‐Field NMR Technique

Hou

Zhao

et al. 2020

JGR Solid Earth

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The permeability of sediments is an important parameter that effects flow characteristics of the gas and water in the process of natural gas hydrates development. The distribution of gas hydrate is generally heterogeneous in porous media. It poses a great challenge to the permeability measurement of hydrate‐bearing sediments. To study the effect of heterogeneous distribution of methane hydrate on the permeability of porous media, methane hydrate formation in the sandstone and permeability measurement was carried out using a low‐field nuclear magnetic resonance (NMR) measurement system in situ conditions. The spatial distribution of methane hydrate in the core samples was determined by combining the T2 distribution with magnetic resonance imaging. The results show that the distribution of methane hydrate is heterogeneous in the core samples. The temporal and spatial variation of permeability happens in the process of hydrate dissociation. The heterogeneity of methane hydrate distribution severely affects the analysis of permeability change. Considering the heterogeneity of methane hydrate distribution, a new method was proposed to obtain the quantitative relationship between hydrate saturation and relative permeability based on magnetic resonance imaging and the equivalent seepage capacity method. The results show that the relative permeability models obtained by this method agree better with experimental results. The optimum coefficients of relative permeability models obtained by equivalent seepage capacity method change significantly in contrast with the direct fitting method. The variation of the optimum coefficient is up to 300% in this study. The model coefficients are related to the pore characteristic of hydrate‐free porous media.

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“…In addition, the permeability is affected by the geomechanical conditions, e.g., effective pressure, which varies during depressurization that is one of the commonly proposed techniques in dissociating gas hydrate (Daigle, 2016). Therefore, an accurate characterization of relative permeability behavior in gas hydrate reservoirs under stress conditions has significance for sustainable gas production in deformable HBS (Nimblett and Ruppel, 2003;Waite et al, 2009;Terzariol et al, 2017;Yang et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Stress dependent gas-water relative permeability in gas hydrates: A theoretical model

Lei

Liao

Lin

et al. 2020

Adv. Geo-Energy Res.

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Research activities are currently being conducted to study multiphase flow in hydratebearing sediments (HBS). In this study, in view of the assumption that hydrates are evenly distributed in HBS with two major hydrate-growth patterns, i.e., pore filling hydrates (PF hydrates), wall coating hydrates (WC hydrates) and a combination of the two, a theoretical relative permeability model is proposed for gas-water flow through HBS. Besides, in this proposed model, the change in pore structure (e.g., pore radius) of HBS due to effective stress is taken into account. Then, model validation is performed by comparing the predicted results from the derived model with that from the existing model and test data. By setting the value of hydrate saturation to zero, our derived model can be reducible to the existing model, which demonstrates that the existing model is a special case of our model. The results reveal that, under the same saturation, relative permeability to water K rw (or gas K rg) in PF hydrates is smaller than that in WC hydrates. Moreover, the morphological characteristics of relative permeability curve (relative permeability versus gas saturation) for WC hydrate and PF hydrate are different.

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Analyzing the effects of inhomogeneity on the permeability of porous media containing methane hydrates through pore network models combined with CT observation

Cited by 128 publications

References 48 publications

Cementation Failure Behavior of Consolidated Gas Hydrate‐Bearing Sand

Cementation Failure Behavior of Consolidated Gas Hydrate‐Bearing Sand

Study on the Effects of Heterogeneous Distribution of Methane Hydrate on Permeability of Porous Media Using Low‐Field NMR Technique

Stress dependent gas-water relative permeability in gas hydrates: A theoretical model

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