Several Factors on Mechanical Property of Methane Hydrate

Hyodo, Masayuki; Nakata, Yukio; Yoshimoto, Nobuko; Matsuo, Tomoka; Ueno, Toshiyuki

doi:10.1299/jsmemecjo.2003.3.0_337

Cited by 3 publications

(7 citation statements)

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“…Many previous studies have proved that the strength (MHBSs) is controlled by T-P P conditions. Furthermore, it has been speculated that the samples' mechanical performance may be affected by the phase equilibrium relationship [39,60,63,69]. This paper further demonstrates the relationship between the mechanical performance of MHBSs and phase equilibrium from another angle by adding salinity variables.…”

Section: Variation Law Of Mhbs Strength Under Saline Conditionsmentioning

confidence: 53%

“…According to previous studies, the T-PP conditions would act on the mechanical performance of MHBSs. The strength and dilatancy of MHBSs increased with increasing distance "L" between T-PP condition points and the hydrate phase equilibrium curve [60]. In this section, there was no difference in the preparation process of the three groups of samples, except for the difference in injected brine concentration in the process of water saturation.…”

Section: The Effect Of Salinity Under Water-saturated Conditionsmentioning

confidence: 70%

“…Previous studies have shown that with decreasing temperature and increasing pore pressure, HBSs will exhibit higher strength and tend to exhibit strain-softening properties and dilatancy [60][61][62]. Moreover, there is a certain correlation between the equilibrium state of the hydrate phase and the mechanical performance of HBSs [39,60,63]. It is worth noting that the marine hydrate reservoir is in a saline environment.…”

Section: Introductionmentioning

confidence: 99%

“…The growth of hydrate crystals, the density of hydrate solids, the ratio of the cage, and the dislocation movement of crystal defects are all influenced by temperature and pressure conditions [39,[55][56][57][58], and might further influence the mechanical performance of HBSs. Previous studies have shown that with decreasing temperature and increasing pore pressure, HBSs will exhibit higher strength and tend to exhibit strain-softening properties and dilatancy [60][61][62]. Moreover, there is a certain correlation between the equilibrium state of the hydrate phase and the mechanical performance of HBSs [39,60,63].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The Effect of Salinity on the Strength Behavior of Hydrate-Bearing Sands

Shu

Wang

et al. 2023

JMSE

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The first prerequisite for the efficient and safe exploitation of gas hydrate resources is to accurately analyze the primary mechanical performance of hydrate-bearing sediments (HBSs). The mechanical performance of HBSs is complex and affected by many factors, including the reservoir environment in situ (temperature, pore pressure, salinity). Several published studies have demonstrated a correlation of the mechanical behavior of hydrates with temperature and pressure (T-PP). However, the research on the effect of salinity on the mechanical properties of hydrates or HBSs is still a relatively blank field. This study found that the strength of HBSs decreased with increasing salinity. This phenomenon can be attributed to the influence of salinity on the phase equilibrium state of hydrates. NaCl changed the relationship between the phase equilibrium curve of the hydrate and the T-PP conditions. The distance between the T-PP conditions and equilibrium curve was reduced with increasing salinity, which in turn led to a decline in sample strength. Moreover, the effect of the phase equilibrium of hydrates on the mechanical performance of HBSs was further explored. NaCl was added to HBSs to regulate the phase equilibrium state of the hydrate. When the T-PP conditions were on the phase equilibrium curve, the strength behaviors of HBSs showed a high degree of consistency.

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Section: Variation Law Of Mhbs Strength Under Saline Conditionsmentioning

confidence: 53%

Section: The Effect Of Salinity Under Water-saturated Conditionsmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Effect of Salinity on the Strength Behavior of Hydrate-Bearing Sands

Shu

Wang

et al. 2023

JMSE

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“…30,53 The physical characteristics of hydrates are strongly temperature-dependent, 54 and as the temperature drops, the stability of the hydrate crystal structure and the strength of hydrates increase. 55,56 Thus, the cohesion effect of hydrates on soil particles is stronger accordingly, 33 which raises the sample's failure strength. Based on the previous study on the temperature effect on gas-saturated hydrate-bearing sandy sediments (without water effect on fine-grained particles), the peak strength of hydrate-bearing sandy sediments increased by nearly 4 MPa when the temperature was increased from 1 to 5 °C.…”

Section: Water Saturation Processmentioning

confidence: 99%

Temperature Effect on Undrained Mechanical Properties of Hydrate-Bearing Clayey Silts in the South China Sea

Wang

Shen

et al. 2023

Energy Fuels

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Nearly 90% of hydrate resources are found in low-permeability and fine-grained soils, which requires investigation on the undrained mechanical characteristics of hydrate-bearing fine-grained soils (HBFGSs) to accomplish safe and efficient hydrate exploitation. Additionally, factors such as hydrothermal and geothermal gradients of the marine sediments and hydrate extraction by heat injection method simultaneously require an understanding of the temperature effect on the stability of HBFGSs and overburden hydrate-free sediments. For these reasons, this study conducted consolidated undrained (CU) triaxial experiments on water-saturated hydrate-free and hydrate-bearing clayey silts in the South China Sea (SCS) at different temperatures and presented results of temperature effects on undrained mechanical properties. This paper reveals the following and analyzes the reasons accordingly: (1) the failure strength of the hydrate-free clayey silts increases with temperature, whereas the failure strength of hydrate-bearing clayey silts decreases with temperature; (2) the temperature has almost no effect on the fitting line of end-of-test data for undrained shear of hydrate-free clayey silts in p′–q space; and (3) the presence of hydrates has a considerable influence on the excess pore pressure response and effective stress paths of clayey silts. The results will contribute to the understanding of the influences of environmental changes and hydrate extraction by thermal injection on the stability of hydrate reservoirs in the SCS.

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Exploring the undrained cyclic behavior of methane-hydrate-bearing sediments using CFD–DEM

Jiang

Liu

Kwok

et al. 2018

Comptes Rendus. Mécanique

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Based on the mechanical experimental results of methane hydrate (MH), a bond contact model considering the rate-dependency of MH is proposed. A CFD-DEM scheme considering fluid compressibility is used to simulate a series of undrained cyclic shear tests of numerical methane-hydrate-bearing sediment (MHBS) samples. The dynamic behavior, including stress-strain relationship, dynamic shear modulus, and damping ratio, is investigated. In addition, the force chains, contact fabric and averaged pure rotation rate (APR) are examined to investigate the relationships between micromechanical variables and macromechanical responses in the DEM MH samples. The effects of temperature, confining pressure and MH saturation are also analyzed. Due to the micro-structural strengthening by the MH bonds, no obvious change in microscopic quantities is observed, and the samples remain at the elastic stage under the applied low-shear stress level. When confining pressure and MH saturation increase, the dynamic elastic modulus increases, while the damping ratio decreases. An increasing temperature (leading to weakening of MH bonds) can lower the dynamic elastic modulus, but has almost no impact on the damping ratio. On the contrary, an increasing cyclic shear stress level lowers the damping ratio, but has almost no effect on the dynamic elastic modulus.

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Several Factors on Mechanical Property of Methane Hydrate

Cited by 3 publications

References 0 publications

The Effect of Salinity on the Strength Behavior of Hydrate-Bearing Sands

The Effect of Salinity on the Strength Behavior of Hydrate-Bearing Sands

Temperature Effect on Undrained Mechanical Properties of Hydrate-Bearing Clayey Silts in the South China Sea

Exploring the undrained cyclic behavior of methane-hydrate-bearing sediments using CFD–DEM

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