Mechanical properties and strength criterion of clayey sand reservoirs during natural gas hydrate extraction

Chen, Huie; Du, Hao; Shi, Bin; Shan, Wenchong; Hou, Jiaqi

doi:10.1016/j.energy.2021.122526

Cited by 21 publications

(14 citation statements)

References 38 publications

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“…The relationship between strength parameters and hydrate saturation is shown in Figure . It can be seen from Figure that cohesion is positively correlated with hydrate saturation . With the increase in hydrate saturation, the cohesion increases rapidly at first and then slowly.…”

Section: Resultsmentioning

confidence: 80%

Triaxial Tests of Hydrate-Bearing Clayey-Silty Sediments Under Different Hydrate Saturations and Effective Confining Pressures

et al. 2022

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It is of great significance to study the mechanical properties of hydrate-bearing sediments for safe and efficient exploitation of hydrate resources. Considering the lack of studies on clay-bearing fine-grained reservoirs, submarine clay taken from the Shenhu Sea in the South China Sea and quartz sand were used to synthesize hydrate-bearing clayey-silty sediments (HBCS). A series of consolidated-drained tests were carried out to investigate the effects of hydrate saturation, effective confining pressure, and their coupling on the mechanical properties of HBCS. The results show that with the increase in hydrate saturation and the decrease in effective confining pressure, the stress–strain curve of the HBCS shows a trend from strain hardening to strain softening. The peak strength and residual strength increase with the increase in effective confining pressure and hydrate saturation. The secant modulus E 50 increases with the increase in hydrate saturation and shows an irregular change trend with the increase in effective confining pressure. The contact area between particles determines the change rule of Secant modulus E 50. With the increase in hydrate saturation, the cohesion first increased rapidly and then increased slowly. The internal friction angle increases with the increase in hydrate saturation, but the increase is small. This indicates that hydrate has a great influence on the cohesion of sediments, but a small influence on the internal friction angle.

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Section: Resultsmentioning

confidence: 80%

Triaxial Tests of Hydrate-Bearing Clayey-Silty Sediments Under Different Hydrate Saturations and Effective Confining Pressures

et al. 2022

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“…However, the subsidence speeds of the clayey‐silty samples accelerated greatly and were larger than those of the sandy ones during hydrate dissociation. The greater mechanical weakening and permeability increase for the clayey‐silty samples due to hydrate dissociation are the main reasons for this behavior 34,35 . Simultaneously, the effective stress continued to increase, speeding up subsidence during dissociation for both types of GHBSs.…”

Section: Results and Analysesmentioning

confidence: 96%

“…Please note that I, II, and III represent the stage before, during, and after hydrate dissociation, respectively hydrate dissociation are the main reasons for this behavior. 34,35 Simultaneously, the effective stress continued to increase, speeding up subsidence during dissociation for both types of GHBSs. With continuous depressurization, the samples were reconsolidated and gradually restored to stability under the increased effective stress.…”

Section: Subsidence Responsementioning

confidence: 96%

Sand production behaviors during gas recovery from sandy and clayey‐silty hydrate‐bearing sediments: A comparative analysis

Ning

Fang

Liu

et al. 2022

Energy Science & Engineering

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“…Hydrate dissociation releases large amounts of gas and water, the pore space is filled with water and gas, the pore pressure increases continuously, and the pore structure of the sediments is disrupted. The dissociation of hydrates results in the loss of cementation between soil particles, which will lead to the reduction of shear strength, and thus accelerate the deformation of seafloor sediments. , …”

Section: Shear Mechanismmentioning

confidence: 99%

Mechanical Properties of Gas Hydrate-Bearing Sediments Influenced by Multiple Factors: A Comprehensive Review of Triaxial Tests

Zeng,

Kong,

Zhao

et al. 2023

Energy Fuels

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Natural gas hydrate (NGH) has the characteristics of low pollution and large reserves, which is considered as a very promising energy source. The extraction of NGH would cause the strength and stiffness reduced in hydrate-bearing sediment (HBS) reservoirs, which could lead to geological disasters. The mechanical properties of HBS have been studied by a large number of scholars, but it has not been sorted out and summarized for HBS under the influence of multiple factors. In this paper, the hydrate types, synthesis methods, and test conditions are summarized. The effects of hydrate saturation, loading rate, temperature, pore pressure, confining pressure, fine content, and clay content on mechanical properties and deformation behavior of HBS are outlined. The microstructure of the synthesis, decomposition, and shear processes of HBS specimens is also analyzed based on the CT triaxial shear test system, and the microscopic mechanism of HBS specimens in the shearing process is summarized. Finally, the shortcomings of current research on the mechanical properties of HBS are discussed, and provided corresponding suggestions to promote the development of the mechanical properties of HBS.

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Mechanical properties and strength criterion of clayey sand reservoirs during natural gas hydrate extraction

Cited by 21 publications

References 38 publications

Triaxial Tests of Hydrate-Bearing Clayey-Silty Sediments Under Different Hydrate Saturations and Effective Confining Pressures

Triaxial Tests of Hydrate-Bearing Clayey-Silty Sediments Under Different Hydrate Saturations and Effective Confining Pressures

Sand production behaviors during gas recovery from sandy and clayey‐silty hydrate‐bearing sediments: A comparative analysis

Mechanical Properties of Gas Hydrate-Bearing Sediments Influenced by Multiple Factors: A Comprehensive Review of Triaxial Tests

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