Compression behavior of hydrate-bearing sediments

Fang, Y.; Flemings, Peter B.; Germaine, John T.; Daigle, Hugh; Phillips, Stephen C.; O'Connell, Josh

doi:10.1306/01132221002

Cited by 3 publications

(20 citation statements)

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“…Figure 12. Ratio of lateral to axial effective stress (K 0 ) as a function of effective stress under uniaxial strain for hydrate-bearing (colored lines and symbols) and non-hydrate-bearing sediments (black line) from GC 955: 8FB3-3, 8FB1-2 (blue and red lines, this study), 7FB3-1, 13FB1, 4FB (filled circles,Fang, Flemings, Germaine, et al, 2022). Fang et al's measurements record the lateral stress ratio after incremental loading.…”

mentioning

confidence: 80%

“…(2022) and Fang, Flemings, Germaine, et al. (2022) described above. It is not obvious why these results are different; THF and methane hydrate crystals share similar mechanical properties (Lee et al., 2007).…”

Section: Introductionmentioning

confidence: 95%

“…Three studies document K 0 values for intact hydrate‐bearing cores: Fang, Flemings, Germaine, et al. (2022), Yoneda et al. (2022), and Yoneda et al.…”

Section: Introductionmentioning

confidence: 99%

“…Fang, Flemings, Germaine, et al. (2022) showed that samples with greater K 0 have greater hydrate saturations. Fang, Flemings, Germaine, et al.…”

Section: Introductionmentioning

confidence: 99%

“…Fang, Flemings, Germaine, et al. (2022) and Yoneda et al. (2022) concluded that viscous relaxation of the hydrate phase results in a greater value of K 0 for hydrate‐bearing sediments compared to equivalent non‐hydrate‐bearing sediments.…”

Section: Introductionmentioning

confidence: 99%

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The Viscoplastic Behavior of Natural Hydrate‐Bearing Sandy‐Silts Under Uniaxial Strain Compression (K₀ Loading)

et al. 2023

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The in‐situ stress state and geomechanical properties of hydrate‐bearing sediments impact hydrate formation and gas production strategies. We explore the uniaxial strain compression and stress evolution of natural hydrate‐bearing sandy‐silts from Green Canyon Block 955 in the deep‐water Gulf of Mexico. We performed constant rate of strain uniaxial strain experiments, interrupted by periods where we held the axial stress constant, to explore the vertical deformation and the evolution of the ratio of lateral to axial effective stress (K0) with time. The hydrate‐bearing sandy‐silt is stiffer and has a larger K0 than the equivalent hydrate‐free sediment upon loading. During stress holds, the void ratio decreases sigmoidally with the log of time, and K0 converges to isotropic conditions. We interpret that during loading, the hydrate bears the load and deforms. With time, the hydrate redistributes the load and K0 increases. We used a viscoelastic model to describe the behavior. The model accurately captures deformation and K0 trends but does not reproduce all the complex interactions of the hydrate with the porous skeleton. We anticipate that viscous effects within hydrate sediments will impact reservoir compression and stresses during production (hours to days), result in isotropic stress state over geological timescales, and explain the creeping movement in submarine landslides.

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mentioning

confidence: 80%

Section: Introductionmentioning

confidence: 95%

“…Three studies document K 0 values for intact hydrate‐bearing cores: Fang, Flemings, Germaine, et al. (2022), Yoneda et al. (2022), and Yoneda et al.…”

Section: Introductionmentioning

confidence: 99%

“…Fang, Flemings, Germaine, et al. (2022) showed that samples with greater K 0 have greater hydrate saturations. Fang, Flemings, Germaine, et al.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Viscoplastic Behavior of Natural Hydrate‐Bearing Sandy‐Silts Under Uniaxial Strain Compression (K₀ Loading)

et al. 2023

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Empirical evaluation of the strength and deformation characteristics of natural and synthetic gas hydrate-bearing sediments with different ranges of porosity, hydrate saturation, effective stress, and strain rate

Yoneda,

Suzuki,

Oshima

et al. 2024

Prog Earth Planet Sci

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Evaluating the mechanical properties of gas (primarily methane) hydrate-bearing sediments is essential for commercial production as a next-generation resource and understanding the global carbon cycle. Triaxial and uniaxial compression tests have been conducted on synthetic gas hydrate and natural core samples recovered from deep-sea beds using pressure coring techniques. The results show that four factors are vital in establishing the strength of hydrate-bearing sediments: hydrate saturation, effective confining stress, porosity, and strain rate. However, no study has evaluated these factors in a unified and quantitative manner, and even if the physical properties of the reservoir are known in detail from logging, predicting the strength has been challenging. In this study, pressure cores were drilled and recovered from the Eastern Nankai Trough in April 2018 after Japan’s second offshore production test, and triaxial or uniaxial compression tests were performed on 12 pressure core samples brought back to the laboratory. The mechanical properties of the hydrate-bearing sediments were classified with previous obtained results from 53 pressure cores and 223 synthetic cores, and empirical equations for triaxial compressive strength and deformation modulus were proposed as functions of gas hydrate saturation, effective confining pressure, porosity, and strain rate. The obtained equations were found to correlate well with the experimental data and can predict the strength and deformation modulus from logging data.

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Geomechanical Behavior of Sandy Silt from Green Canyon 955 Hydrate Reservoir - Deepwater Gulf of Mexico

Bhandari,

Cardona,

Flemings

et al. 2023

Preprint

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Compression behavior of hydrate-bearing sediments

Cited by 3 publications

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The Viscoplastic Behavior of Natural Hydrate‐Bearing Sandy‐Silts Under Uniaxial Strain Compression (K₀ Loading)

The Viscoplastic Behavior of Natural Hydrate‐Bearing Sandy‐Silts Under Uniaxial Strain Compression (K₀ Loading)

Empirical evaluation of the strength and deformation characteristics of natural and synthetic gas hydrate-bearing sediments with different ranges of porosity, hydrate saturation, effective stress, and strain rate

Geomechanical Behavior of Sandy Silt from Green Canyon 955 Hydrate Reservoir - Deepwater Gulf of Mexico

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Compression behavior of hydrate-bearing sediments

Cited by 3 publications

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The Viscoplastic Behavior of Natural Hydrate‐Bearing Sandy‐Silts Under Uniaxial Strain Compression (K0 Loading)

The Viscoplastic Behavior of Natural Hydrate‐Bearing Sandy‐Silts Under Uniaxial Strain Compression (K0 Loading)

Empirical evaluation of the strength and deformation characteristics of natural and synthetic gas hydrate-bearing sediments with different ranges of porosity, hydrate saturation, effective stress, and strain rate

Geomechanical Behavior of Sandy Silt from Green Canyon 955 Hydrate Reservoir - Deepwater Gulf of Mexico

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The Viscoplastic Behavior of Natural Hydrate‐Bearing Sandy‐Silts Under Uniaxial Strain Compression (K₀ Loading)

The Viscoplastic Behavior of Natural Hydrate‐Bearing Sandy‐Silts Under Uniaxial Strain Compression (K₀ Loading)