Experimental Study on the &lt;i&gt;In Situ&lt;/i&gt; Mechanical Properties of Methane Hydrate-Bearing Sediments

Sun, Zhong Ming; Zhang, Jian; Liu, Changling; Zhao, Shi Jun; Ye, Yu Guang

doi:10.4028/www.scientific.net/amm.275-277.326

Cited by 13 publications

(4 citation statements)

References 8 publications

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“…When the confining pressure was higher than 7.5 MPa, the failure strength started to decrease. These results are consistent with previous research [34,35]. According to Yun and Li [8,34], an increase in confining pressure can lead to the compaction of a sample, preventing the hydrate crystals from detaching from the mineral's surface or rotating.…”

Section: The Effect Of Confining Pressuresupporting

confidence: 92%

Experimental Study on the Mechanical Properties of CH4 and CO2 Hydrate Remodeling Cores in Qilian Mountain

Luo

Liu

et al. 2017

Energies

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Abstract:The CH 4 -CO 2 replacement method has attracted global attention as a new promising method for methane hydrate exploitation. In the replacement process, the mechanical stabilities of CH 4 and CO 2 hydrate-bearing sediments have become problems requiring attention. In this paper, considering the hydrate characteristics and burial conditions of hydrate-bearing cores, sediments matrices were formed by a mixture of kaolin clay and quartz sand, and an experimental study was focused on the failure strength of CH 4 and CO 2 hydrate-bearing sediments under different conditions to verify the mechanical reliability of CH 4 -CO 2 replacement in permafrost-associated natural gas deposits. A series of triaxial shear tests were conducted on the CH 4 and CO 2 hydrate-bearing sediments under temperatures of −20, −10, and −5 • C, confining pressures of 2.5, 3.75, 5, 7.5, and 10 MPa, and a strain rate of 1.0 mm/min. The results indicated that the failure strength of the CO 2 hydrate-bearing sediments was higher than that of the CH 4 hydrate-bearing sediments under different confining pressures and temperatures; the failure strength of the CH 4 and CO 2 hydrate-bearing sediments increased with an increase in confining pressure at a low confining pressure state. Besides that, the failure strength of all hydrate-bearing sediments decreased with an increase in temperature; all the failure strengths of the CO 2 hydrate-bearing sediments were higher than those of the CH 4 hydrate-bearing sediments in different sediment matrices. The experiments proved that the hydrate-bearing sediments would be more stable than that before CH 4 -CO 2 replacement.

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Section: The Effect Of Confining Pressuresupporting

confidence: 92%

Experimental Study on the Mechanical Properties of CH4 and CO2 Hydrate Remodeling Cores in Qilian Mountain

Luo

Liu

et al. 2017

Energies

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“…The same method was used for Ottawa sand by Winters et al [2007] and Ghiassian and Grozic [2013]. Sun et al [2013], Wei et al [2011], and Yan et al [2012] used the PWS method to form hydrates and conducted triaxial compression tests on sand, but the origins of the host specimens were not reported. Other experimental studies include tests by Hyodo et al [2014] and Ordonez and Grozic [2011] on CO 2 hydrates, using Toyoura sand and Ottawa sand, respectively.…”

Section: Previous Experimental Study On Mh-bearing Soilsmentioning

confidence: 99%

Role of critical state framework in understanding geomechanical behavior of methane hydrate‐bearing sediments

2016

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A proper understanding of geomechanical behavior of methane hydrate‐bearing sediments is crucial for sustainable future gas production. There are a number of triaxial experiments conducted over synthetic and natural methane hydrate (MH)‐bearing sediments, and several soil constitutive models have been proposed to describe their behavior. However, the generality of a sophisticated model is questioned if it is tested only for a limited number of cases. Furthermore, it is difficult to experimentally determine the associated parameters if their physical meanings and significance are not elucidated. The objective of this paper is to demonstrate that a simple extension of the critical state framework is sufficient to capture the geomechanical behavior of MH‐bearing soils from various sources around the world, while the significance of each parameter is quantified through variance‐based global sensitivity analyses. Our results show that the influence of hydrates can be largely represented by one hydrate‐dependent parameter, pcd′, which controls the expansion of the initial yield surface. This is validated through comparisons with shearing and volumetric response of MH‐bearing soils tested at various institutes under different confining stresses and with varying degrees of hydrate saturation. Our study suggests that the behavior of MH‐bearing soils can be reasonably predicted based on pcd′ and the conventional critical state parameters of the host sediments that can be obtained through typical geotechnical testing procedures.

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“…The difference in the stress-strain curve of soil under drained and undrained conditions has been widely recognized (Terzaghi et al 1996). Most of the triaxial shear tests on the HBS reported in the literature are under the drained condition (Hyodo et al 2013b(Hyodo et al , 2014a(Hyodo et al , 2017Luo et al 2020a, b;Miyazaki et al 2011a;Yun et al 2007) and several are under the undrained condition (Ghiassian and Grozic 2013;Sun et al 2013;Zhang et al 2012).…”

Section: Stress-strain and Volumetric Behavior Of The Hbsmentioning

confidence: 99%

Hydrate morphology and mechanical behavior of hydrate-bearing sediments: a critical review

Hou

Huang

et al. 2022

Geomech. Geophys. Geo-energ. Geo-resour.

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and differences of the hydrate morphology in the HBS synthesized using the excess-gas and excess-water methods are highlighted. The available experimental data on the small-strain stiffness, strength, and stressstrain behavior are critically selected and grouped into two categories based on the synthesizing methods. It has been creatively discovered that most mechanical parameters (e.g., bulk modulus, shear modulus, cohesion, dilation angle) share a concave power relationship with the hydrate saturation S H for the HBS synthesized using the excess-water method. While it is a convex power relationship for the bulk modulus, shear modulus, and dilation angle, and a linear relationship for the cohesion c when the HBS is synthesized using the excess-gas method. These observations contribute to establishing the conceptual model reflecting the particle-level failure mechanism of the Abstract Natural gas hydrate is a promising energy resource in the future because of its little contamination and huge reserve. However, gas exploitation may induce large deformation and failure of the seabed due to a reduction in the stiffness and strength of the hydrate-bearing sediment (HBS). Therefore, it is essential to investigate the mechanical behavior of the HBS for safe and efficient gas exploitation. Additionally, it is widely acknowledged that the hydrate morphology inherently affects the mechanical behavior of the HBS. This paper aims to critically synthesize the information on the hydrate morphology and mechanical behavior of the HBS available in the literature to facilitate the application of the research result into engineering practice and provide guidance for future investigation. Hydrate morphology is identified firstly both in natural and synthesized HBS. The similarities

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Experimental Study on the <i>In Situ</i> Mechanical Properties of Methane Hydrate-Bearing Sediments

Cited by 13 publications

References 8 publications

Experimental Study on the Mechanical Properties of CH4 and CO2 Hydrate Remodeling Cores in Qilian Mountain

Experimental Study on the Mechanical Properties of CH4 and CO2 Hydrate Remodeling Cores in Qilian Mountain

Role of critical state framework in understanding geomechanical behavior of methane hydrate‐bearing sediments

Hydrate morphology and mechanical behavior of hydrate-bearing sediments: a critical review

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