Comparison of fluid production between excess-gas and excess-water hydrate-bearing sediments under depressurization and its implication on energy recovery

Zhang, Jidong; Yin, Zhenyuan; Li, Qingping; Li, Shuaijun; Wang, Yi; Li, Xiao-Sen

doi:10.1016/j.energy.2023.128315

Cited by 9 publications

(2 citation statements)

References 56 publications

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“…As can be seen, the sub-cooling (T sub ) of MH formation at the pore-scale in this process was ∼10.2 K. It was interesting to note that the T sub required to induce MH formation on the microfluidic chip (in the range of 10-15 K) 20 was usually higher than that in actual marine sediments (in the range of 3-8 K). 36 This can be possibly attributed to two reasons: (a) the existence of impurities in marine sediments (such as montmorillonite minerals) promotes heterogeneous nucleation and reduces both the induction time and T sub . 37 (b) The near-perfect smooth surface of the fabricated microfluidic chip does not provide additional nucleation sites for MH heterogeneous nucleation.…”

Section: Resultsmentioning

confidence: 99%

Path-dependent morphology of CH₄ hydrates and their dissociation studied with high-pressure microfluidics

Zhang,

Yin,

Khan

et al. 2024

Lab Chip

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Section: Resultsmentioning

confidence: 99%

Path-dependent morphology of CH₄ hydrates and their dissociation studied with high-pressure microfluidics

Zhang,

Yin,

Khan

et al. 2024

Lab Chip

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“…4 Due to the high saturation of the marine NGH reservoirs, a large amount of free water will be released with the NGH dissociation. 5 This can easily lead to unbalanced drainage around the production well during the production process, and a significant influx of water into the production well can result in sand production. 6 Sand production is a bottleneck problem that restricts long-term NGH production.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cationic Polyacrylamide on Gas–Water Seepage in Quartz Sands before and after Methane Hydrate Formation

Feng,

Li,

Chen

et al. 2024

Energy Fuels

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Excessive water production impacted marine natural gas hydrate production. Cationic polyacrylamide (CPAM), one kind of chemical reagent, was used for the first time to selectively reduce water production while having less impact on gas production. After quartz sands with an absolute permeability of 100−1000 mD were treated with CPAM, the water phase permeability was reduced to 1/15, while the gas phase permeability almost had no change. Furthermore, CPAM was effective in controlling water flow in quartz sands with an absolute permeability range of 100−1000 mD. The water phase permeability initially decreased and then stabilized as the concentration of CPAM increased from 500 to 20,000 ppm. Additionally, the formation of methane hydrate in pretreated quartz sands with CPAM led to a greater reduction in quartz sands' permeability than the sum of the respective reduction for CPAM treatment and methane hydrate formation. In addition, compared to quartz sands treated only with CPAM, the dissociation of 5% methane hydrate significantly increased the permeability of CPAM-treated quartz sands, but the permeability was smaller than that before CPAM treatment.

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Experimental Analysis on Thermodynamic and Kinetic Characteristics of Water‐Saturated Natural Gas Hydrates by Depressurization Decomposition

Yang,

Pang,

Gong

et al. 2024

Energy Tech

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Natural gas hydrate has attracted worldwide attention for its abundant availability and clean and nonpolluting combustion products. The actual environment of marine methane hydrates is water‐saturated, but present researches on water‐saturated hydrates are relatively few. This study prepares water‐saturated hydrate sediment of ≈70% saturation and mainly focuses on the thermodynamic and kinetic characteristics of decomposition process using different depressurization rates. Compared with gas‐saturated hydrates, both the thermodynamic evolution and the decomposition kinetics of water‐saturated hydrates get weakened due to the inhibition of water molecules surrounding hydrate crystals on heat and mass transfer. In all experimental cases of water‐saturated hydrates, the temperature still decreases at most 0.5 °C in several minutes after the pressure has become constant, indicating the delay effect of depressurization in water phase. The results show that the increase in depressurization rate strengthens both temperature decrease and pressure delay of water‐saturated hydrate‐bearing sediment. In addition, the decomposition rate of water‐saturated hydrates in depressurization stage is constant and positive to the depressurization rate, while the decomposition rate in constant pressure stage is a function of residual hydrate amount. This study is significant for decomposition control of hydrate mining under actual marine environment.

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Comparison of fluid production between excess-gas and excess-water hydrate-bearing sediments under depressurization and its implication on energy recovery

Cited by 9 publications

References 56 publications

Path-dependent morphology of CH₄ hydrates and their dissociation studied with high-pressure microfluidics

Path-dependent morphology of CH₄ hydrates and their dissociation studied with high-pressure microfluidics

Effect of Cationic Polyacrylamide on Gas–Water Seepage in Quartz Sands before and after Methane Hydrate Formation

Experimental Analysis on Thermodynamic and Kinetic Characteristics of Water‐Saturated Natural Gas Hydrates by Depressurization Decomposition

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Comparison of fluid production between excess-gas and excess-water hydrate-bearing sediments under depressurization and its implication on energy recovery

Cited by 9 publications

References 56 publications

Path-dependent morphology of CH4 hydrates and their dissociation studied with high-pressure microfluidics

Path-dependent morphology of CH4 hydrates and their dissociation studied with high-pressure microfluidics

Effect of Cationic Polyacrylamide on Gas–Water Seepage in Quartz Sands before and after Methane Hydrate Formation

Experimental Analysis on Thermodynamic and Kinetic Characteristics of Water‐Saturated Natural Gas Hydrates by Depressurization Decomposition

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Path-dependent morphology of CH₄ hydrates and their dissociation studied with high-pressure microfluidics

Path-dependent morphology of CH₄ hydrates and their dissociation studied with high-pressure microfluidics