Pore-scale flow simulation on the permeability in hydrate-bearing sediments

Xu, Jianchun; Bu, Ziwei; Li, Hangyu; Li, Shuxia; Sun, Baojiang

doi:10.1016/j.fuel.2021.122681

Cited by 28 publications

(19 citation statements)

References 77 publications

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“…Recently, existing research has adopted homogenous assumptions of porous media in the flow tests and microscale numerical simulations [25,29,123,138]. In addition, most of the existing permeability models, especially the simplified theoretical models [23], assume a homogeneous distribution of sediment particles and hydrates in pore space, which is different from the actual microstructure of gas hydrate reservoirs, and further adopt the parallel capillary theory, Kozeny-Carman equation and Darcy's law to facilitate the theoretical derivation of the analytical expression of permeability.…”

Section: Anisotropy and Heterogeneity Of Hbssmentioning

confidence: 99%

“…The permeability controlling gas-water flow within pores of coarse-grained HBSs has been extensively investigated, as they are considered to be most beneficial for gas production in the future [22]. Previous experimental and numerical investigations have shown that the HBS permeability is affected by a series of factors, including hydrate growth habits [23][24][25], hydrate saturation [26,27], sediment particle size [28,29], effective stress [30,31], anisotropy and heterogeneity of sediments [32][33][34], hydrate dissociation and reformation [35,36], wettability [37], interfacial tension [38], etc. Consequently, the study of the HBS permeability is more complicated than that of other types of sediments.…”

Section: Introductionmentioning

confidence: 99%

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Permeability Models of Hydrate-Bearing Sediments: A Comprehensive Review with Focus on Normalized Permeability

et al. 2022

Energies

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Natural gas hydrates (NGHs) are regarded as a new energy resource with great potential and wide application prospects due to their tremendous reserves and low CO2 emission. Permeability, which governs the fluid flow and transport through hydrate-bearing sediments (HBSs), directly affects the fluid production from hydrate deposits. Therefore, permeability models play a significant role in the prediction and optimization of gas production from NGH reservoirs via numerical simulators. To quantitatively analyze and predict the long-term gas production performance of hydrate deposits under distinct hydrate phase behavior and saturation, it is essential to well-establish the permeability model, which can accurately capture the characteristics of permeability change during production. Recently, a wide variety of permeability models for single-phase fluid flowing sediment have been established. They typically consider the influences of hydrate saturation, hydrate pore habits, sediment pore structure, and other related factors on the hydraulic properties of hydrate sediments. However, the choice of permeability prediction models leads to substantially different predictions of gas production in numerical modeling. In this work, the most available and widely used permeability models proposed by researchers worldwide were firstly reviewed in detail. We divide them into four categories, namely the classical permeability models, reservoir simulator used models, modified permeability models, and novel permeability models, based on their theoretical basis and derivation method. In addition, the advantages and limitations of each model were discussed with suggestions provided. Finally, the challenges existing in the current research were discussed and the potential future investigation directions were proposed. This review can provide insightful guidance for understanding the modeling of fluid flow in HBSs and can be useful for developing more advanced models for accurately predicting the permeability change during hydrate resources exploitation.

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Section: Anisotropy and Heterogeneity Of Hbssmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Permeability Models of Hydrate-Bearing Sediments: A Comprehensive Review with Focus on Normalized Permeability

et al. 2022

Energies

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“…As a result, many researchers use pore-scale simulation methods to study dynamic permeability evolution in hydrate-bearing sediments. − At present, there are many numerical simulation methods to investigate the pore-scale flow and obtain dynamic permeability in hydrate-bearing sediments, which can be classified into direct numerical simulation methods and pore network modeling. The most commonly used direct numerical simulation methods in porous media involve the lattice Boltzmann method ,− and grid-based computational fluid dynamics , such as the finite volume method, finite difference method, finite element method, and so on. Direct simulation methods can be used to study the pore-scale flow based on complex pore throat cross-sections in hydrate-bearing sediments.…”

Section: Introductionmentioning

confidence: 99%

Regular Pore Network Model to Study Dynamic Permeability Evolution in Hydrate-Bearing Sediments

Chen

et al. 2023

Energy Fuels

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Permeability is a key parameter to characterize fluid flow in hydrate-bearing sediments. Figuring out dynamic permeability evolution is of great importance for the effective development of hydrate-bearing deposits. In this paper, a grain-coating hydrate-bearing regular pore network model with complex pore throat cross-sections is first constructed. Afterward, the dynamic permeability evolution regularity is calculated. After the validation, the effects of initial aspect ratio, coordination number, and pore throat cross-sections on dynamic permeability evolution are investigated. The results show that hydrate narrows the effective flow space, which results in the exponential decrease of dynamic permeability with the increased hydrate saturation. The larger initial aspect ratio aggravates the heterogeneity of the pore network, resulting in a faster permeability decline rate. However, hydrate weakens the effect of initial aspect ratio on dynamic permeability evolution since the physical hydrate thickness in large pore bodies and throats is larger. The high initial coordination number reduces the dynamic permeability decline rate with the increased hydrate saturation since the higher coordination number increases the topology of the network, while hydrate compresses or blocks the effective pore throat space. Pore throat cross-sections have nothing to do with dynamic permeability evolution, but they dramatically influence the absolute permeability values. This study provides a novel insight into dynamic permeability evolution in hydratebearing sediments.

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“…Five types of hydrate occurrence modes in hydrate-bearing sediments were established, including particle inclusion type, pore filling type, throat filling type, particle cementation type, and bearing type. The influence of a skeleton particle and hydrate distribution on the permeability change was analyzed . Zhao et al proposed a Masuda permeability correction model that takes into account changes in the effective stress (0.2–5.0 MPa) and hydrate saturation (36.6–53.1%) to calculate the dynamic permeability during the depression–reduction process.…”

Section: Introductionmentioning

confidence: 99%

“…The influence of a skeleton particle and hydrate distribution on the permeability change was analyzed. 18 Zhao et al proposed a Masuda permeability correction model that takes into account changes in the effective stress (0.2−5.0 MPa) and hydrate saturation (36.6−53.1%) to calculate the dynamic permeability during the depression−reduction process. On this basis, the dynamic permeability was applied to the mathematical model to study the gas production characteristics of methane hydrate.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Difference of Fluid Flow between Methane Hydrate-Bearing Sand and Clay Sediments

Yang

Liu

et al. 2022

Energy Fuels

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The gas−water seepage of natural gas hydrate sediments in the South China Sea significantly influences the efficiency of reservoir production of water/gas. However, there are significant differences between gas and water flow in methane hydrate-bearing sand and clay sediments. In this study, a series of permeability experiments were carried out in quartz and montmorillonite sediments in the presence of methane hydrate. The experiment results indicated that gas permeability decreases with increasing effective stress in montmorillonite and quartz in the absence of methane hydrate. The decrease in porosity has a higher impact on the permeability of quartz sand than that of montmorillonite. Due to the different effects of methane hydrate formation on the pore structure of sand and clay, with the increase in methane hydrate saturation in quartz sand and montmorillonite, the effect of effective stress on the permeability reduction of quartz sand is gradually weakened but the effect of effective stress on the permeability reduction of montmorillonite is gradually enhanced. Under the condition of constant total stress, the gas permeability decreases with the decomposition of methane hydrate. The permeability damage rate of montmorillonite caused by methane hydrate decomposition is much higher than that of quartz sand due to the swelling effect of montmorillonite particles. In addition, the water-phase seepage of quartz in the presence of methane hydrate is in line with the Darcy seepage characteristics. However, the water-phase seepage of montmorillonite in the presence of methane hydrate has non-Darcy seepage characteristics and the calculated water permeability is far less than the gas permeability.

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Pore-scale flow simulation on the permeability in hydrate-bearing sediments

Cited by 28 publications

References 77 publications

Permeability Models of Hydrate-Bearing Sediments: A Comprehensive Review with Focus on Normalized Permeability

Permeability Models of Hydrate-Bearing Sediments: A Comprehensive Review with Focus on Normalized Permeability

Regular Pore Network Model to Study Dynamic Permeability Evolution in Hydrate-Bearing Sediments

Experimental Study on the Difference of Fluid Flow between Methane Hydrate-Bearing Sand and Clay Sediments

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