Characteristic Analysis of Hot Dry Rock Damage and Failure Under Thermal Shock

Tang, Jupeng; Cui, Hanbo; Jiang, Xintong

doi:10.1615/jpormedia.2021036014

Cited by 3 publications

(1 citation statement)

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“…During heat recovery, the low-temperature injected fluid exchanges heat with the HDR reservoir to extract and utilize its heat energy. 1,2 Carbon sequestration (CS) captures the combustion source CO 2 and injects it into natural containers for long-term storage to reduce the impact of greenhouse gases on the global climate. 3,4 The cost of traditional CS can reach 50 EUR/ton, far higher than the 6 EUR/ton for purchasing emission quotas, making companies less motivated to engage in CO 2 sequestration.…”

Section: Introductionmentioning

confidence: 99%

Study on the productivity and mechanism of physical field evolution of enhanced geothermal systems under different working fluid types and properties

Cui,

Jiang,

et al. 2024

AIP Advances

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The injected working fluid conditions directly affect the heat generation efficiency of a stimulated hot dry rock reservoir. Taking exploration well GR1 in the Gonghe Basin of Qinghai as the research object, a stochastic discrete fracture reservoir model was established around the main injection channel, and the productivity variation pattern of the enhanced geothermal system (EGS) and the spatiotemporal evolution mechanism of the reservoir fields were analyzed for CO2 and H2O working fluids. The interaction mechanism between the upper and lower rock formations and the reservoir during the heat mining process was discussed. This study obtained the following findings: (1) when the working fluid was CO2, after 20 years of heat recovery, the injection flow rate, output flow rate, and heat generation efficiency with a working fluid temperature of 60 °C reached 1.22 times, 1.18 times, and 1.92 times those with a working fluid temperature of 35 °C, respectively. The average subsidence and average geostress with the working fluid temperature of 60 °C were low, at only 90.61% and 95.96% of those with the working fluid temperature of 35 °C, respectively. However, high-temperature fluid injection increased flow loss. The changes in the various laws of H2O-EGS were similar to those of CO2-EGS. (2) When the working fluid temperature was 35 °C, after 20 years of heat recovery, the output flow rate and heat generation efficiency with the CO2-EGS reached 12.66 times and 1.28 times those with the H2O-EGS, respectively. However, the flow loss, average subsidence, and average geostress were higher with the CO2-EGS, reaching 6.58 times, 1.14 times, and 1.06 times those with the H2O-EGS, respectively. The patterns in these parameters observed at the other temperatures were similar to those observed at 35 °C. (3) The temperature decrease of the cushion layer was higher than that of the caprock, while the subsidence of the caprock was higher, and this phenomenon was more obvious when the working fluid temperature was lower. The conclusions obtained have important reference significance for the rational selection of working fluids.

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Section: Introductionmentioning

confidence: 99%

Study on the productivity and mechanism of physical field evolution of enhanced geothermal systems under different working fluid types and properties

Cui,

Jiang,

et al. 2024

AIP Advances

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Experimental investigation on the physical-thermal properties of Nanan granite after air and water cooling for deep geothermal heat extraction

Zhu,

Yang,

Wang

et al. 2024

Renewable Energy

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Numerical Simulation on the Heat Extraction of Enhanced Geothermal System With Different Fracture Networks by Thermal-Hydraulic-Mechanical Model

et al. 2023

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Hot dry rock (HDR), as a kind of geothermal energy resource, has attracted much attention due to its wide distribution and huge reserves. This paper presents a numerical study on energy mining in the HDR by the enhanced geothermal system (EGS). The thermal-hydraulic-mechanical coupling model is employed in these simulations. The multi-field evolution process and the influence of the fracture parameters on the heat recovery performance of an EGS are analyzed comprehensively. The results show that the fractures parallel to the connecting line of the injection-production well can lead to an early thermal breakthrough, resulting in a thermal recovery performance decrease, while fractures perpendicular to the connecting line between the production and injection wells can enhance the production temperature of an EGS, when compared with the reservoir without fractures. The production temperature drop rate of the EGS with percolated fracture network is much quicker than that of the EGS with an isolated fracture network. Additionally, short fractures can lessen the potential for working fluid preferred flow channels to emerge; therefore, an EGS with short fractures may operate better than an EGS with lengthy fractures.

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Characteristic Analysis of Hot Dry Rock Damage and Failure Under Thermal Shock

Cited by 3 publications

References 0 publications

Study on the productivity and mechanism of physical field evolution of enhanced geothermal systems under different working fluid types and properties

Study on the productivity and mechanism of physical field evolution of enhanced geothermal systems under different working fluid types and properties

Experimental investigation on the physical-thermal properties of Nanan granite after air and water cooling for deep geothermal heat extraction

Numerical Simulation on the Heat Extraction of Enhanced Geothermal System With Different Fracture Networks by Thermal-Hydraulic-Mechanical Model

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