Effect of Heating Rate on the Dynamic Compressive Properties of Granite

Shu, Ronghua; Yin, Tubing; Li, Xibing

doi:10.1155/2019/8292065

Cited by 15 publications

(5 citation statements)

References 27 publications

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“…12, with the increasing heating rate, the dynamic compressive strength, and dynamic elastic modulus decrease, whereas the peak strain increases gradually. This trend is consistent with the experimental results (Shu et al, 2019). Thus, it could also be expected that the rock formation is more likely to be induced to fracture by the injection fluid under a high heating rate.…”

Section: Discussionsupporting

confidence: 92%

Numerical simulation of hydraulic fracturing in enhanced geothermal systems considering thermal stress cracks

Zhou

Mikada

Takekawa

et al. 2021

Preprint

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With the increasing attention to clean and economical energy resources, geothermal energy and enhanced geothermal systems (EGS) have gained much importance. For the efficient development of deep geothermal reservoirs, it is crucial to understand the mechanical behavior of reservoir rock and its interaction with injected fluid under high temperature and high confining pressure environments. In the present study, we develop a novel numerical scheme based on the distinct element method (DEM) to simulate the failure behavior of rock by considering the influence of thermal stress cracks and high confining pressure for EGS. We validated the proposing method by comparing our numerical results with experimental laboratory results of uniaxial compression tests under various temperatures and biaxial compression tests under different confining pressure regarding failure patterns and stress-strain curves. We then apply the developed scheme to the hydraulic fracturing simulations under various temperatures, confining pressure, and injection fluid conditions. Our numerical results indicate that the number of hydraulic cracks is proportional to the temperature. At a high temperature and low confining pressure environment, a complex crack network with large crack width can be observed, whereas the generation of the micro cracks is suppressed in high confining pressure conditions. In addition, high-viscosity injection fluid tends to induce more hydraulic fractures. Since the fracture network in the geothermal reservoir is an essential factor for the efficient production of geothermal energy, the combination of the above factors should be considered in hydraulic fracturing treatment in EGS.

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Section: Discussionsupporting

confidence: 92%

Numerical simulation of hydraulic fracturing in enhanced geothermal systems considering thermal stress cracks

Zhou

Mikada

Takekawa

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…19, the dynamic compressive strength and dynamic elastic modulus decrease with the increasing heating rate, whereas the peak strain increases gradually. This trend is consistent with the experimental results (Shu et al, 2019). Thus, it is also expected that the rocks are more likely to be induced to fracture by the injection fluid under a high heating rate.…”

Section: Discussionsupporting

confidence: 92%

“…Research on the development of geothermal resources has attracted the interest of scholars for a long time. As mentioned before, many experiments on the thermodynamic response of rocks have been carried out (Rossi et al, 2018;Shu et al, 2019;Yang et al, 2017 for example), which were mainly distinguished from conventional mechanical experiments of rock by the thermal treatment of specimen. In the thermal treatment stage, specimens are heated to their target temperature through a high-temperature furnace, and they are then cooled naturally to room temperature (25 °C) in a confined space.…”

Section: Discussionmentioning

confidence: 99%

Numerical Simulation of Hydraulic Fracturing in Enhanced Geothermal Systems Considering Thermal Stress Cracks

Zhou

Mikada

Takekawa

et al. 2022

Pure Appl. Geophys.

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With the increasing attention to clean and economical energy resources, geothermal energy and enhanced geothermal systems (EGS) have gained much importance in recent years. For the efficient development of deep geothermal reservoirs, it is crucial to understand the mechanical behavior of reservoir rock and its interaction with injected fluid under high-temperature and high confining pressure environments for employing hydraulic stimulation technologies. In the present study, we develop a novel numerical scheme based on the distinct element method (DEM) to simulate the failure behavior of rock by considering the influence of thermal stress cracks and high confining pressure for EGS. The proposed methodology is validated by comparing uniaxial compression tests at various temperatures and biaxial compression tests at different confining pressures with laboratory experimental results. The numerical results indicate a good agreement in terms of failure models and stress-strain curves with those of laboratory experiments. We then apply the developed scheme to the hydraulic fracturing simulations under various temperatures, confining pressures, and injection fluid conditions. Based on our numerical results, the number of hydraulic cracks is proportional to the temperature. At a high-temperature and low confining pressure environment, a complex crack network with large crack width can be observed, whereas the generation of the micro-cracks is suppressed in high confining pressure conditions. In addition, high-viscosity injection fluid tends to induce more hydraulic cracks. Since the crack network in the geothermal reservoir is an essential factor for the efficient production of geothermal energy, the combination of the above factors should be considered in hydraulic fracturing treatment in EGS.

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“…This procedure results in a spatially homogeneous and slow heating of the rock sample. Although the differences between slow and fast heating of rocks have been investigated in previous studies (Chen et al 2017;Shu et al 2019), more research is required on the effectiveness of removal of flame-treated rocks by scratch tests. Such work should also investigate the effects of different heating rates on the overall drilling performance during CTMD.…”

Section: Discussionmentioning

confidence: 99%

The influence of thermal treatment on rock–bit interaction: a study of a combined thermo–mechanical drilling (CTMD) concept

2020

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The construction of wells, for example to extract oil, gas or heat from underground reservoirs requires substantial financial investments, which are mainly related to the involved drilling operations (Tester et al. 2006;Akin and Karpuz 2008;Petty et al. 2009;Lukawski et al. 2014;Diaz et al. 2017). Additionally, the current trend of accessing deeper underground resources poses challenges for the overall project economics, as the costs increase exponentially with well depth (Fitzgerald 2013;Abdo and Haneef 2013;Hu et al. 2013). This is especially unfavourable for enhanced geothermal systems (EGSs)

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Effect of Heating Rate on the Dynamic Compressive Properties of Granite

Cited by 15 publications

References 27 publications

Numerical simulation of hydraulic fracturing in enhanced geothermal systems considering thermal stress cracks

Numerical simulation of hydraulic fracturing in enhanced geothermal systems considering thermal stress cracks

Numerical Simulation of Hydraulic Fracturing in Enhanced Geothermal Systems Considering Thermal Stress Cracks

The influence of thermal treatment on rock–bit interaction: a study of a combined thermo–mechanical drilling (CTMD) concept

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