Measurement of effective thermal conductivity of hydrate-bearing sediments and evaluation of existing prediction models

Wang, Bin; Fan, Zhen; Lv, Pengfei; Zhao, Jiafei; Song, Yongchen

doi:10.1016/j.ijheatmasstransfer.2017.02.085

Cited by 54 publications

(36 citation statements)

References 36 publications

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“…Figure 11a shows that, for both series of simulated results in gas‐saturated environment, the apparent thermal conductivities of HBS λ h increase with increasing hydrate saturation, which agrees with the experimental result of Wang et al (2017). This behavior is primarily a result of the thermal conductivity of methane gas λ Tmg being lower than that of methane hydrate λ Tmh , along with the increase in hydrate saturation, so that the proportion of gas decreases gradually, which eventually leads to an increase in the apparent thermal conductivity of HBS λ h .…”

Section: Resultssupporting

confidence: 86%

“…In accord with the literature (Wang et al, 2017;Yang et al, 2015), the thermal conductivities of sand λ Ts was set as 2.6 W/(m•K), the thermal conductivity of methane hydrate λ Tmh was set as 0.58 W/(m•K), the thermal conductivity of methane gas λ Tmg was set as 0.03 W/(m•K) and the thermal conductivity of water λ Tw was set as 0.61 W/(m•K). Figure 11 shows the influences of hydrate saturation on the apparent thermal conductivity λ h of gas-saturated and water-saturated HBS for the different hydrate occurrences.…”

Section: Journal Of Geophysical Research: Solid Earthsupporting

confidence: 77%

“…Some experimental permeability measurements have also been compiled according to different matrixes from reservoirs (Johnson et al, 2011; Liu et al, 2020; Wu et al, 2018; Wu, Liu, et al, 2020). The thermal conductivity of HBS is complex because the formation of hydrate between sediment grains enhances the heat transfer between solid particles, and it is related to many parameters, including hydrate saturation, hydrate occurrence, and grain distribution (Dai et al, 2015; Waite et al, 2002, 2005; Wang et al, 2017; Yang et al, 2015). Detailed literature reviews of the physical properties of HBS are discussed elsewhere (Li et al, 2016; Lijith et al, 2019; Ren et al, 2020; Waite et al, 2009; Yan et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Pore‐Scale 3D Morphological Modeling and Physical Characterization of Hydrate‐Bearing Sediment Based on Computed Tomography

Sun

et al. 2020

JGR Solid Earth

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Natural gas hydrate is considered to be a promising future energy resource; therefore, obtaining its physical properties is crucial for evaluating gas production efficiency and developing reasonable exploitation strategies. In this study, we present a novel pore-scale 3D morphological modeling algorithm considering various saturation and occurrences (cementing and pore-filling) of hydrate in sediments. To evaluate the performance of the presented algorithm, 14 hydrate-bearing sediment models were constructed based on X-ray computed tomographic images of a consolidated sandy specimen under an effective stress of 3 MPa. Morphologically, the new algorithm generated pore-scale hydrate occurrences coincide with published morphological behaviors of hydrate observed via computed tomography. The tortuosity and fractal dimension of pore spaces of these models were then characterized. The pore networks are also extracted, based on which the evolution of the pore characteristics including the distributions of pore radius, throat radius, throat length, and the coordination number were investigated. Using these generated models, simulations of permeability, thermal conductivity, and electrical conductivity were conducted to evaluate the influences of hydrate saturation and occurrence. These results are validated against published data, demonstrating that this algorithm could be an effective way to construct digital hydrate-bearing sediment models using a single set of computed tomographic images of a hydrate-free specimen. This new method can also be significant for the physical evaluation of natural cores in which hydrate has dissociated during core recovering and transferring.

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Section: Resultssupporting

confidence: 86%

Section: Journal Of Geophysical Research: Solid Earthsupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

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Pore‐Scale 3D Morphological Modeling and Physical Characterization of Hydrate‐Bearing Sediment Based on Computed Tomography

Sun

et al. 2020

JGR Solid Earth

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“…53 Wang et al noted that the effective thermal conductivity increased slightly with the decomposition of the hydrate and the heat transfer capacity increased. 54 These reports indicate that external heat could be better transmitted through the silica sand medium to have the heat absorbed by the hydrate decomposition in this experiment.…”

Section: Analysis Of Raman Resultsmentioning

confidence: 69%

Microscopic measurements on the decomposition behaviour of methane hydrates formed in natural sands

2019

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“…The flaky clay was found in the Pearl River Mouth (PRM) basin by Wang et al They believed that the flaky clay could promote the formation of hydrates by increasing the contact area. Furthermore, the effect of hydrate saturation on the effective thermal conductivity and the porosity of hydrate‐bearing sediments was examined . The formation process of the tetrahydrofuran hydrate in porous media was studied by Yang et al It was found that the effective thermal conductivity decreased with the increase of hydrate saturation and the porosity of the sediments.…”

Section: Analyzing the Basic Physical Properties Of Hydrate Sedimentsmentioning

confidence: 99%

Application of X‐Ray Computed Tomography Technology in Gas Hydrate

Zheng

Tang

et al. 2019

Energy Tech

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Clathrate hydrates are formed by water molecules and natural gas molecules under a certain temperature and pressure. Natural gas hydrates are mainly distributed in the marine sediments and the permafrost in nature. As a kind of potential clean energy, determining the structural characteristics of hydrates in sediments is the prerequisite for the safe and economic exploitation of natural gas hydrate. X‐ray computed tomography (CT) is a potential method to nondestructively detect the occurrence of natural gas hydrate. The basic physical properties such as porosity, hydrate saturation, and sediment permeability of the hydrate‐bearing sediments are analyzed by calculating the CT numbers or combining with the network model. Therefore, the X‐ray CT is used to study the hydrates produced in the laboratory and the hydrates formed in the nature by scientists all over the world. By summarizing the previous research, this article focuses on the important role of X‐ray CT in the hydrate research from the following three aspects: analyzing the basic physical properties of hydrate sediment, identifying the occurrence mode of hydrate in sediments, and measuring the hydrate formation and decomposition process. In response to the research progress and future research directions, relevant suggestions had been put forward.

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Measurement of effective thermal conductivity of hydrate-bearing sediments and evaluation of existing prediction models

Cited by 54 publications

References 36 publications

Pore‐Scale 3D Morphological Modeling and Physical Characterization of Hydrate‐Bearing Sediment Based on Computed Tomography

Pore‐Scale 3D Morphological Modeling and Physical Characterization of Hydrate‐Bearing Sediment Based on Computed Tomography

Microscopic measurements on the decomposition behaviour of methane hydrates formed in natural sands

Application of X‐Ray Computed Tomography Technology in Gas Hydrate

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