Permeability investigation and hydrate migration of hydrate–bearing silty sands and silt

Li, Gang; Xu, Zelin; Li, Xiao-Sen; Shen, Pengfei; Lv, Qiu-Nan

doi:10.1016/j.jngse.2021.103891

Cited by 21 publications

(12 citation statements)

References 44 publications

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“…The saturation of hydrate has a more obvious effect on the water-phase permeability of silty clay than that of silty sand soil. 37 Wu et al systematically studied the effects of methane hydrate dissociation and effective stress on the gas permeability of clay sediments. The experimental results show that the relationship between permeability and effective stress of montmorillonite is more in line with exponential function.…”

Section: Introductionmentioning

confidence: 99%

“…The experimental results show that lower methane hydrate saturation also has a large effect on the absolute permeability of the water phase. The saturation of hydrate has a more obvious effect on the water-phase permeability of silty clay than that of silty sand soil . Wu et al systematically studied the effects of methane hydrate dissociation and effective stress on the gas permeability of clay sediments.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on Permeability of Methane Hydrate Clayey Interbedded Sediments Considering Effective Stress and Hydrate Dissociation

Zhou

Zhu

et al. 2023

Energy Fuels

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Owing to the heterogeneity of methane hydrate reservoirs in the South China Sea, hydrate and silty clay particles mostly exist in the form of interbedded reservoirs. Permeability is a decisive factor for the efficiency of interbedded methane hydrate deposits. Therefore, using montmorillonite as the simulated sediment material, permeability measurements of interbedded sediments with different methane hydrate distributions and effective stresses were carried out for the first time in this study. By comparing with homogeneous sediments, the permeability evolution of interbedded sediments under different hydrate distributions and effective stresses is explored, and the effect of methane hydrate dissociation on the permeability of interbedded sediments is analyzed. The results show that the permeability of interbedded sediments with different hydrate saturation levels has little difference and is almost the same as that of pure soil sediments. With the increase of effective stress, the porosity of methane hydrate interbedded sediments decreases and permeability damage is caused, but the final permeability damage is less obvious than that of homogeneous hydrate sediments. In addition, the gas slip effect exists in methane hydrate interbedded sediments. Moreover, the dissociation of methane hydrate causes clay swelling, which leads to the decrease of interbedded permeability, but the degree of permeability damage is lower than that of homogeneous sediments. The results of this study provide a theoretical basis for the development and utilization of interbedded methane hydrate sediments in the South China Sea.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study on Permeability of Methane Hydrate Clayey Interbedded Sediments Considering Effective Stress and Hydrate Dissociation

Zhou

Zhu

et al. 2023

Energy Fuels

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“…During the shear process, when the axial strain reaches a certain value, the formation of the shear band leads to a significant increase in permeability. Li et al perfected measurements of water effectiveness and relative permeability ( k W and k rW ) for silts and silts with different methane hydrate saturations . The reduction of dissolved methane in the water leads to the dissociation of methane hydrates and the formation of flow channels in the sediments.…”

Section: Introductionmentioning

confidence: 99%

“…Li measurements of water effectiveness and relative permeability (k W and k rW ) for silts and silts with different methane hydrate saturations. 15 The reduction of dissolved methane in the water leads to the dissociation of methane hydrates and the formation of flow channels in the sediments. Even at a low level of methane hydrate saturation, its influence on K W is very obvious.…”

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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“…For hydrate saturation greater than 35%, the measured results agree better with pore-filling models. Li et al 31 studied the effective permeability and relative permeability (k w and k rw ) of silty sands and silt with different values of the hydrate saturation (S H ). He found that the effects of S H greater and less than about 5% were different, and S H presented a more obvious effect on the k rw of silt than on that of silty sands.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Gas Permeability of Marine Sediments with Various Hydrate Saturations and Effective Stresses

et al. 2021

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Marine methane hydrate is considered to be one of the future energy sources with the most potential due to its tremendous reserves. Permeability is a key parameter affecting the recovery efficiency and gas recovery of gas hydrate. We studied the dependence of gas permeability on hydrate saturation and effective stress using remolded core from the South China Sea. The results show that, with increasing hydrate saturation, the gas permeability first decreases, then increases, and decreases finally, which may be due to the combined effect of the growth habit of hydrates in the pores, the interaction between hydrates and particles, and the effect of effective stress. The formation and decomposition of hydrates in the sediment will cause a decrease in gas permeability. When hydrate saturation is 40.66%, the gas permeability decreases by 13 times due to hydrate formation. The gas permeability presents an approximate linear negative relationship with effective stress. The presence of hydrate significantly reduces the stress sensitivity of the sediment. A stress-sensitive critical saturation between 36.60 and 40.66% makes the ratio of permeability change to effective stress change close to a constant. This work bridges the gap of gas permeability of marine sediments between laboratory samples and natural sediments, providing reliable seepage parameters for the numerical simulation of marine hydrate exploration.

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Permeability investigation and hydrate migration of hydrate–bearing silty sands and silt

Cited by 21 publications

References 44 publications

Experimental Study on Permeability of Methane Hydrate Clayey Interbedded Sediments Considering Effective Stress and Hydrate Dissociation

Experimental Study on Permeability of Methane Hydrate Clayey Interbedded Sediments Considering Effective Stress and Hydrate Dissociation

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

Experimental Study on the Gas Permeability of Marine Sediments with Various Hydrate Saturations and Effective Stresses

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