Fundamental characteristics of gas hydrate-bearing sediments in the Shenhu area, South China Sea

Lyu, Xin; Li, Qingping; Ge, Yang; Zhu, Junlong; Zhou, Shouwei; Fu, Qiang

doi:10.1007/s11708-020-0714-z

Cited by 14 publications

(3 citation statements)

References 29 publications

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“…The clayey-silty sand reservoirs in the South China Sea are mainly composed of clays (<4 μm) and fine sands (4-64 μm) [42]. According to the actual geological exploration data of w17 station where shsc-4, the first hydrate pilot production well in the South China Sea in 2017, is located, the average particle size of sediments is about 12 μm.…”

Section: Experimental Materialsmentioning

confidence: 99%

Experimental Investigation on Deformation and Permeability of Clayey–Silty Sediment during Hydrate Dissociation by Depressurization

et al. 2023

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The sediments in the South China sea are mainly composed of clayey silt, characterized by weak cementation, low strength, and poor permeability. These characteristics lead to slow gas and water transport and low gas production efficiency in the production process, which is not conducive to reservoir stability. Therefore, this paper studied the influence of different factors on the displacement and permeability of hydrate-bearing sediments by using remolded cores from the South China Sea. It was found that, when the depressurization method was used for hydrate decomposition, the displacement change in sediments could be divided into three stages: depressurization stage, decomposition stage, and creep stage. During the decompression stage, sediment deformation was rapid and displacement was small. During the decomposition process of hydrates, sediment deformation was slow and displacement was maximum. The creep stage had the slowest deformation and the smallest displacement. The displacement increased with the increase in initial porosity, hydrate saturation, effective pressure, and depressurization amplitude. The permeability of the sediments was lower than that of the original sediments after hydrate decomposition. This permeability damage increased with the increase in the sediment porosity, hydrate saturation, depressurization range and effective pressure. Furthermore, the displacement of sediments was positively correlated with the permeability damage.

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Section: Experimental Materialsmentioning

confidence: 99%

Experimental Investigation on Deformation and Permeability of Clayey–Silty Sediment during Hydrate Dissociation by Depressurization

et al. 2023

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“…Gas hydrate is a nonstoichiometric clathrate crystal formed by water molecules and small gas molecules at high pressure and low temperature. , Nature gas hydrate widely distributed in permafrost and marine sediment and 1 m 3 of methane hydrate can store 160 m 3 of methane gas . Hence, methane hydrate has been considered as a kind of alternative clean energy source, and the safe and economic exploitation of methane hydrate has became the focus of research by scientists all over the world. , …”

Section: Introductionmentioning

confidence: 99%

“…3 Hence, methane hydrate has been considered as a kind of alternative clean energy source, 4 and the safe and economic exploitation of methane hydrate has became the focus of research by scientists all over the world. 5,6 The traditional hydrate exploitation methods including the depression method, 7,8 thermal stimulation method, 9,10 CO 2 − CH 4 replacement method, 11,12 and inhibitor injection method. 13,14 Among them, the depressurization method is the most studied and most commonly used method for hydrate exploitation, and it was applied in the first trial mining in the Nankai Trough of Japan.…”

Section: Introductionmentioning

confidence: 99%

Rheological Properties of Hydrate Slurry Formed from Mudflows in South China Sea

Liu

Zhang

et al. 2021

Energy Fuels

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Solid fluidization is a current promising method to explore hydrate resources. The rheological properties of hydrate slurry are significant to solid fluidization and prevent hydrate blockage during pipeline transportation. To determine the impact of hydrate on the rheological properties of mudflow, a rheological experiment was conducted on methane hydrate slurry formed from a mudflow, which was prepared with marine sediment sampled from South China Sea. It was found that both mudflow and hydrate slurry exhibited viscoelastic fluid properties. The existence of hydrate substantially increased the apparent viscosity of the mudflow, and when the hydrate formed at a rapid rate, the apparent viscosity rose rapidly. With different initial pressures, the amount of hydrate formed in mudflow was different. A larger water conversion rate would increase the viscosity of the hydrate slurry significantly. Meanwhile, a yield stress measurement was conducted by stress sweep after hydrate formation. When the water conversion fractions were 17.8%, 20.3%, and 21.2%, the yield stresses of the hydrate slurry were 57.8, 465.2, and over 10,000 Pa, respectively. In addition, a frequency test sweep was conducted, and the results showed that the existence of hydrate would significantly increase the elasticity of the slurry.

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Analysis of physical properties of gas hydrate-bearing unconsolidated sediment samples from the ultra-deepwater area in the South China Sea

Lyu

et al. 2021

Front. Energy

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Fundamental characteristics of gas hydrate-bearing sediments in the Shenhu area, South China Sea

Cited by 14 publications

References 29 publications

Experimental Investigation on Deformation and Permeability of Clayey–Silty Sediment during Hydrate Dissociation by Depressurization

Experimental Investigation on Deformation and Permeability of Clayey–Silty Sediment during Hydrate Dissociation by Depressurization

Rheological Properties of Hydrate Slurry Formed from Mudflows in South China Sea

Analysis of physical properties of gas hydrate-bearing unconsolidated sediment samples from the ultra-deepwater area in the South China Sea

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