An Investigation on the Influence of Thermal Damage on the Physical, Mechanical and Acoustic Behavior of Indian Gondwana Shale

Srinivasan, Vinoth; Tripathy, Ashutosh; Gupta, T. K.; Singh, T. N.

doi:10.1007/s00603-020-02087-2

Cited by 59 publications

(15 citation statements)

References 69 publications

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“…Then, the above suggested extrapolation does not apply. In addition, the heterogeneity in other rock samples e.g., the beddings in shale and the differential thermal expansivity of the minerals in granite could induce rock inelasticity upon the changes in temperature as well [7][8][9]. In the presence of induced rock inelasticity, the amplification-and the metal chip-related offsets should be excluded from the measurements before the actual thermal rock strain and its time-dependent development could be revealed.…”

Section: Applicability Of the Workflowmentioning

confidence: 99%

“…Besides the techniques that can be used to detect the changes in rocks' microstructure towards the variations in temperature [7][8][9], strain gauges and clip-on extensometers could also be used to measure the rock strain on a sample scale (10 cm). The clip-on extensometers based on resistive strain gauges are often applied monitoring thermal rock strain within the triaxial cell of a mechanical testing system (MTS).…”

Section: Introductionmentioning

confidence: 99%

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The effects of the temperature in the testing system on the measurements of thermal rock strain with clip-on extensometers

et al. 2022

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Section: Applicability Of the Workflowmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effects of the temperature in the testing system on the measurements of thermal rock strain with clip-on extensometers

et al. 2022

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“…Taking deep shale gas extraction as an example, temperature is an important factor in deep reservoir reconstruction. High temperatures in deep shale reservoirs can affect the permeability, brittleness, anisotropy behavior, and failure mechanism, thus impacting the gas production rate in engineering applications (Verma et al 2016;Srinivasan et al 2020;Chen et al 2021). Therefore, it is necessary to perform laboratory tests on shale specimens subjected to high temperatures to understand their failure characteristics and provide useful reference information for related shale projects.…”

Section: Introductionmentioning

confidence: 99%

“…Guo et al (2020) carried out uniaxial compression tests and AE monitoring on shale specimens after thermal treatment at 25 to 200 °C and found that the mechanical parameters, failure characteristics, and AE evolution were clearly and intricately affected by the increase in temperature. Srinivasan et al (2020) focused on using AE signals to identify the changes in Indian Gondwana Shale induced by high-temperature treatment and found that the fracturing intensity observed from AE signals was mainly controlled by the bedding planes and treatment temperature. Chen et al (2021) investigated the permeabilities of shale specimens in two typical bedding plane inclinations both before and after microwave radiation.…”

Section: Introductionmentioning

confidence: 99%

Failure characteristics of shale after being subjected to high temperatures under uniaxial compression

Huang

Guo

2021

Bull Eng Geol Environ

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Uniaxial compression tests and acoustic emission (AE) monitoring of shale specimens with horizontal and perpendicular bedding planes after being subjected to high temperatures were conducted to investigate the effect of a high-temperature environment on shale failure characteristics. The results reveal that specimens in the two bedding directions experienced severe rockburst failure. The rockburst processes of all the tested specimens were similar and can be divided into two main stages according to the specific failure characteristics, spalling stage, and ejection stage, and the increasing temperature had a significant effect on the rockburst characteristics of specimens in the two bedding directions at each stage. The fractal dimension of specimens in the two bedding directions increased with increasing temperature and increased much more for specimens with perpendicular bedding planes. The high-energy AE signals induced by the rockburst failure of specimens became more significant with increasing temperature, and the step-jump frequency of cumulative AE energy for specimens with perpendicular bedding planes increased gradually. The sudden drop in the amplitude of the AE b value resulting from spalling, ejection, and monolithic failure became larger for specimens in the two bedding directions with increasing temperature. Before the peak stress, the AE b value of specimens with horizontal bedding planes showed a stable period that was unaffected by increasing temperature, while the AE b value of specimens with perpendicular bedding planes also showed a plateau period in the prepeak stage when the temperature was lower than 100 °C and disappeared when the temperature exceeded 100 °C.

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“…Sharma et al studied the effect of temperature on the creep properties of organic-rich shales at both nano and micro-scales and found creep properties are affected by the removal of clay-bound water above 200 • C 15 . Other researchers studied macro-scale fracture behavior of shales at higher temperatures up to 500 °C and concluded that the temperature change tends to substantially alter the fracture behavior as microcracks are formed within the shale rock 16,17 . Others showed that the elastic modulus decreases significantly with an increase in the temperatures.…”

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confidence: 99%

Thermo-mechanical characterization of shale using nanoindentation

Porter

Naleway

et al. 2021

Sci Rep

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Shale can be a potential buffer for high-level radioactive nuclear wastes. To be an effective buffer while subject to waste heat, shale's mechanical response at elevated temperature must be known. Many researchers have experimentally characterized the mechanical behavior of various shales at different length scales in adiabatic conditions. However, its mechanical performance at elevated temperatures at the nano-scale remains unknown. To investigate the temperature dependency of nanomechanical properties of shale, we conducted both experimental and numerical studies. In this study, we measured mechanical and fracture properties of shale, such as hardness, elastic modulus, anisotropy, and fracture toughness from 25 °C up to 300 °C at different bedding planes. Statistical analysis of the results suggests that hardness and fracture toughness significantly increased at temperatures from 100 to 300 °C; while, temperature does not have a significant impact on elastic modulus. Data also shows that the bedding plane orientations have a substantial impact on both mechanical and fracture properties of shale at the nano-scale leading to distinct anisotropic behavior at elevated temperature below 100 °C. Additionally, we numerically investigated the mechanical performance of the shale samples at room temperature to gain an insight into its mechanical response through the thickness. Numerical results were validated against the experimental results, confirming the simulation can be used to predict shale deformation at the nano-scale or potentially be used in multi-scale simulations.

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An Investigation on the Influence of Thermal Damage on the Physical, Mechanical and Acoustic Behavior of Indian Gondwana Shale

Cited by 59 publications

References 69 publications

The effects of the temperature in the testing system on the measurements of thermal rock strain with clip-on extensometers

The effects of the temperature in the testing system on the measurements of thermal rock strain with clip-on extensometers

Failure characteristics of shale after being subjected to high temperatures under uniaxial compression

Thermo-mechanical characterization of shale using nanoindentation

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