Experimental study on the effect of methane hydrate decomposition on gas phase permeability of clayey sediments

Wu, Zhiying; Li, Yanghui; Sun, Xiaofeng; Wu, Peng; Zheng, Jia‐nan

doi:10.1016/j.apenergy.2018.09.053

Cited by 101 publications

(43 citation statements)

References 34 publications

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“…From Figure 9, the absolute permeabilities K h calculated via the FVM methods and PNM methods are quite similar in sediments with the same hydrate saturation, showing that both methods were equally reliable. Moreover, Figures 9a and 9b show that the absolute permeability K h decreases exponentially with increasing hydrate saturation for both models, which is similar to the results of previous experimental studies (Ji et al, 2020; Kuang et al, 2019; Wu et al, 2018) and simulation studies (Chen et al, 2018; Dai & Seol, 2014; Li, Liu, et al, 2019). This is primarily because the generation of hydrate blocks the flow channels.…”

Section: Resultssupporting

confidence: 88%

“…Journal of Geophysical Research: Solid Earth (Ji et al, 2020;Kuang et al, 2019;Wu et al, 2018) and simulation studies (Chen et al, 2018;Dai & Seol, 2014;. This is primarily because the generation of hydrate blocks the flow channels.…”

Section: 1029/2020jb020570mentioning

confidence: 99%

“…Seol and Kneafsey (2011) captured the hydrate distribution evolution and potential discrete flow pathways variation in HBS specimens using X‐ray CT. 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).…”

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: 88%

Section: 1029/2020jb020570mentioning

confidence: 99%

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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“…Permeability is also an important factor, which affects the decomposition of hydrates. Combining related research from Yin et al 55 and Wu et al, 56 the median particle size contains more clay in the 13-24 micron sediment in this experiment, the formation of the bound water and swelling of clay might blocks the airow path. As shown in Fig.…”

Section: Analysis Of Raman Resultssupporting

confidence: 66%

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

2019

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“…Up to now, a series of experimental studies on artificial hydrate-bearing sediments have been conducted systematically in the laboratory [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]. It has been proven that the confining pressure, sediment matrix, hydrate saturation and hydrate type have significant influences on the failure strength, stiffness and volume characteristics of hydrate-bearing sediments [9,[36][37][38][39][40][41][42][43][44].…”

Section: Introductionmentioning

confidence: 99%

Strength Behaviors of Remolded Hydrate-Bearing Marine Sediments in Different Drilling Depths of the South China Sea

Luo

Sun

et al. 2019

Energies

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The mechanical behaviors of hydrate-bearing marine sediments (HBMS) drilled from the seafloor need to be understood in order to safely exploit natural gas from marine hydrate reservoirs. In this study, hydrates were prepared using ice powder and CH4 gas, and HBMS from the Shenhu area in the South China Sea were remolded using a mixed sample preparation method. A series of triaxial tests were conducted on the remolded HBMS to investigate the effects of soil particle gradation and the existence of hydrate on the mechanical properties of hydrate reservoirs. The results show that the stiffness and failure strength of HBMS decrease along with the decrease of mean particle size and soil aggregate morphology change at different drilling depths, and the reduction of failure strength is more than 20% when the drilling depth drops by 30 m. A better particle gradation of marine sediments may boost the stiffness and failure strength of HBMS. In addition, the existence of hydrate plays an important role in the strength behaviors of HBMS. The reduction of failure strength of HBMS with 30% initial hydrate saturation is more than 35% after complete hydrate dissociation.

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Experimental study on the effect of methane hydrate decomposition on gas phase permeability of clayey sediments

Cited by 101 publications

References 34 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

Strength Behaviors of Remolded Hydrate-Bearing Marine Sediments in Different Drilling Depths of the South China Sea

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