Experimental investigation on thermal cracking, permeability under HTHP and application for geothermal mining of HDR

Zhao, Yangsheng; Feng, Zhiwei; Zhao, Yu; Wan, Zhifeng

doi:10.1016/j.energy.2017.05.093

Cited by 101 publications

(31 citation statements)

References 30 publications

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“…e multiple proportions is 14.33 at 300°C ( Table 1), indicating that thermal cracking leads to the changes in the structure of the granite specimen (i.e., generation of new cracks or extension of the existing cracks). e results are consistent with previous research [20,21,24,25]. However, the fracture rate is greater than that of Zhang et al [24], re ecting the e ect of initial damage on thermal cracking.…”

Section: Experimental Analysis Of Permeability Of Granitesupporting

confidence: 92%

“…Hence, the permeability of granite decreases. e results of this experiment are consistent with the granite experiment [20] and gypsum experiment [22].…”

Section: Experimental Analysis Of Permeability Of Granitesupporting

confidence: 89%

“…Stage II, severe thermal cracking (200∼250°C): the stage is very di erent from that of low damage stage and the previous studies [20,21]. A severe increase in granite permeability can be seen with increasing temperature.…”

Section: Experimental Analysis Of Permeability Of Granitementioning

confidence: 71%

“…Homand and Houpert [17] found that, in granite, thermal stress produces new fractures. Zhao et al [18][19][20] carried out a systematic experimental study on thermal cracking regularity and permeability evolution of a large granite sample in the range of 20∼600°C and found that thermal cracking is intermittent with two or more peak intervals and permeability also presented multiple peak accordingly.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of Thermal Cracking and Permeability Evolution of Granite with Varying Initial Damage under High Temperature and Triaxial Compression

Meng

Liu

Meng

2018

Advances in Materials Science and Engineering

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Thermal cracking and permeability evolution of granite under high temperature and triaxial compression are the key to designing high-level waste disposal sites. In this paper, uniaxial compression tests of granite specimens with different axial compression are designed, and then a solid-head-designed coupling triaxial testing system is applied to study thermal cracking and permeability evolution of granite specimen with different damage at different inlet gas pressures (1, 2, 4, and 6 MPa) and temperatures (ranging from 100 to 650°C). The test results show that granite, nearly impermeable rocks, can show a striking increase of permeability by heating beyond the critical temperature. When the initial axial pressure is 60% or 70% of the uniaxial compressive strength, the growth of granite permeability exhibits three stages during 100∼650°C heating process. Permeability increases by two orders of magnitude, but it does not reach the maximum value (i.e., a network of interconnected cracks is not fully formed in the specimen). With increasing initial damage, permeability shows a sharp increase. Permeability increases by three orders of magnitude, it is in equilibrium state, and a network of interconnected cracks is fully formed in the specimen. Permeability of granite has a critical temperature at which permeability increases sharply. When the temperature is lower than the critical temperature, the magnitude of permeability is 10−18 m2 with a slight increase. When temperature is higher than the critical temperature, the magnitude of permeability is 10−15 m2 with a sharp increase. The critical temperature is related to the initial damage of specimen, and the critical temperature is smaller with the initial damage going larger. Therefore, studying thermal cracking and permeability evolution of granite with different initial damage under high temperature and triaxial compression is expected to provide necessary and valuable insight into the design and construction of high-level waste disposal structures.

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Section: Experimental Analysis Of Permeability Of Granitesupporting

confidence: 92%

“…Hence, the permeability of granite decreases. e results of this experiment are consistent with the granite experiment [20] and gypsum experiment [22].…”

Section: Experimental Analysis Of Permeability Of Granitesupporting

confidence: 89%

Section: Experimental Analysis Of Permeability Of Granitementioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental Investigation of Thermal Cracking and Permeability Evolution of Granite with Varying Initial Damage under High Temperature and Triaxial Compression

Meng

Liu

Meng

2018

Advances in Materials Science and Engineering

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“…Dentre os processos estudados encontra-se o de craqueamento térmico que se constitui por reações químicas irreversíveis de substâncias ricas em carbono e hidrogênio, pela ação de calor em atmosfera desprovida de oxigênio. A reação ocorre entre 300 a 1000°C e é predominantemente endotérmica (Zhao et al, 2017, Sadrameli, 2015. A modelagem e simulação de processos são ferramentas usadas no projeto de plantas piloto, bem como na ampliação de escala (Blanco e Chejne, 2016).…”

Section: Introductionunclassified

Análise Da Influência Da Condutividade Térmica Do “Heat Carrier” No Craqueamento Térmico De Butano Em Leito Móvel

Almeida¹,

Bueno²,

Ludwinsky³

et al. 2018

Blucher Chemical Engineering Proceedings

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Geothermo‐mechanical alterations due to heat energy extraction in enhanced geothermal systems: Overview and prospective directions

Ngoma,

Kolawole,

Olorode

2024

Deep Underground Science and Engineering

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Geothermal energy from deep underground (or geological) formations, with or without its combination with carbon capture and storage (CCS), can be a key technology to mitigate anthropogenic greenhouse gas emissions and meet the 2050 net‐zero carbon emission target. Geothermal resources in low‐permeability and medium‐ and high‐temperature reservoirs in sedimentary sequence require hydraulic stimulation for enhanced geothermal systems (EGS). However, fluid migration for geothermal energy in EGS or with potential CO2 storage in a CO2‐EGS are both dependent on the in situ flow pathway network created by induced fluid injection. These thermo‐mechanical interactions can be complex and induce varying alterations in the mechanical response when the working fluid is water (in EGS) or supercritical CO2 (in CO2‐EGS), which could impact the geothermal energy recovery from geological formations. Therefore, there is a need for a deeper understanding of the heat extraction process in EGS and CO2‐EGS. This study presents a systematic review of the effects of changes in mechanical properties and behavior of deep underground rocks on the induced flow pathway and heat recovery in EGS reservoirs with or without CO2 storage in CO2‐EGS. Further, we proposed waterless‐stimulated EGS as an alternative approach to improve heat energy extraction in EGS. Lastly, based on the results of our literature review and proposed ideas, we recommend promising areas of investigation that may provide more insights into understanding geothermo‐mechanics to further stimulate new research studies and accelerate the development of geothermal energy as a viable clean energy technology.

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Experimental investigation on thermal cracking, permeability under HTHP and application for geothermal mining of HDR

Cited by 101 publications

References 30 publications

Experimental Investigation of Thermal Cracking and Permeability Evolution of Granite with Varying Initial Damage under High Temperature and Triaxial Compression

Experimental Investigation of Thermal Cracking and Permeability Evolution of Granite with Varying Initial Damage under High Temperature and Triaxial Compression

Análise Da Influência Da Condutividade Térmica Do “Heat Carrier” No Craqueamento Térmico De Butano Em Leito Móvel

Geothermo‐mechanical alterations due to heat energy extraction in enhanced geothermal systems: Overview and prospective directions

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