Numerical study on sandstone strength and failure characteristics with heterogeneous structure

Wang, Feng; Jie, Zeqi; Li, Hongyang; Yin, Dawei; Zhu, Weihao; Zhou, Jingkui; Zou, Yulong

doi:10.1007/s10064-022-03027-w

Cited by 4 publications

(2 citation statements)

References 28 publications

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“…Fluid-inclusion structures and the formation of fault gouges in the reservoir can also result in local heterogeneity. Numerical simulations also found that the presence of soft heterogeneous particles in sandstone can decrease the crack initiation stress, damage stress, and static modulus values [134]. Grain-scale heterogeneity in sandstones can also govern the stress concentration points of crack initiation and crack propagation direction.…”

Section: Effect Of Heterogeneitymentioning

confidence: 86%

Comprehensive review of geomechanics of underground hydrogen storage in depleted reservoirs and salt caverns

Ramesh Kumar,

Honorio,

Chandra

et al. 2023

Preprint

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Hydrogen is a promising energy carrier for a low-carbon future energy system, as it can be stored on a megaton scale (equivalent to TWh of energy) in subsurface reservoirs. However, safe and eﬀicient underground hydrogen storage requires a thorough understanding of the geomechanics of the host rock under fluid pressure fluctuations. In this context, we summarize the current state of knowledge regarding geomechanics relevant to carbon dioxide and natural gas storage in salt caverns and depleted reservoirs. We further elaborate on how this knowledge can be applied to underground hydrogen storage. The primary focus lies on the mechanical response of rocks under cyclic hydrogen injection and production, fault reactivation, the impact of hydrogen on rock properties, and other associated risks and challenges. In addition, we discuss wellbore integrity from the perspective of underground hydrogen storage. The paper provides insights into the history of energy storage, laboratory scale experiments, and analytical and simulation studies at the field scale. We also emphasize the current knowledge gaps and the necessity to enhance our understanding of the geomechanical aspects of hydrogen storage. This involves developing predictive models coupled with laboratory scale and field-scale testing, along with benchmarking methodologies.

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Section: Effect Of Heterogeneitymentioning

confidence: 86%

Comprehensive review of geomechanics of underground hydrogen storage in depleted reservoirs and salt caverns

Ramesh Kumar,

Honorio,

Chandra

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…As natural geological materials, rocks exhibit obvious heterogeneity in both physical and mechanical properties due to differences in particle sizes, particle shapes, and the type and distribution of rock-forming minerals. The deformation and strength characteristics of rocks are largely controlled by internal heterogeneous structures of the rock 1 – 5 . Under external forces, the heterogeneous structures lead to an uneven distribution of the stress field inside the rock, which will affect the mechanical properties and mechanical behavior of rock under loading, thereby influencing the fracture and failure evolution process of the rock 6 – 8 .…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of strength and failure analysis of heterogeneous sandstone under different loading rates

Zhu,

Wang,

et al. 2023

Sci Rep

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Natural rock masses often contain heterogeneous structures with varying sizes, non-uniform distributions, and strengths, which influence the mechanical response characteristics and crack propagation modes under loading. Furthermore, heterogeneous structures can affect the stability of the rock mass, in serious cases, leading to geotechnical and mining engineering disasters. In the present work, a parallel-bond model (PBM)-based numerical simulation using Particle Flow Code (PFC) was carried out to study the strength and failure characteristics of sandstone specimens with heterogeneous structures under different loading rates. The results show that the peak strength increases with the increasing loading rate. In addition, all of the initial cracks occurred at the edges of the heterogeneous structures of specimens under different loading rates. The greater the loading rate, the greater the stress concentration degree at the edge of the heterogeneous structures, the greater the dissipated energy as the sandstone specimens with heterogeneous structures suffer damage, the more intense the acoustic emission activity, and the greater the damage degree of the specimens. The number of cracks generated in sandstone specimens with heterogeneous structures increases gradually with the increasing loading rate during the initial loading stage, and gradually decreases after the specimens are damaged. Cracks propagate and develop from the upper right region to the lower right region of the specimens, forming crack groups that rapidly penetrate the specimens, leading to failure. Under different loading rates, the final failure behavior of the sandstone specimens with heterogeneous structures changes from an inverted V-type to θ-type, then gradually evolves to O-type failure.

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Comprehensive review of geomechanics of underground hydrogen storage in depleted reservoirs and salt caverns

Ramesh Kumar,

Honorio,

Chandra

et al. 2023

Journal of Energy Storage

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Numerical study on sandstone strength and failure characteristics with heterogeneous structure

Cited by 4 publications

References 28 publications

Comprehensive review of geomechanics of underground hydrogen storage in depleted reservoirs and salt caverns

Comprehensive review of geomechanics of underground hydrogen storage in depleted reservoirs and salt caverns

Numerical simulation of strength and failure analysis of heterogeneous sandstone under different loading rates

Comprehensive review of geomechanics of underground hydrogen storage in depleted reservoirs and salt caverns

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