Development of a semi-analytical method to calculate depth-dependent temperature and stress changes: investigation of micro-seismicity at Unterhaching Uha GT-2 geothermal well

Luo, Xuan; Hou, Zhengmeng; Kracke, T; Gou, Yang; Were, Patrick

doi:10.1007/s12665-015-4392-9

Cited by 4 publications

(3 citation statements)

References 19 publications

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“…A maximum induced thermal stress of 49.4 MPa can be observed in the vicinity of the injection well, exceeding poroelastic stresses. These findings are directly in line with previous results [18]. From…”

Section: Geomechanical Modelsupporting

confidence: 94%

3D thermo‐hydro‐mechanical simulation of the behaviour of a naturally fractured petrothermal reservoir in deep Upper Jurassic carbonates of the Bavarian Molasse Basin – Case study Geretsried

Rioseco

Dussel

Moeck

2022

Geomechanics and Tunnelling

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Based on multi‐scale and multi‐disciplinary measured data, gathered at the Geretsried geothermal site, a 3D reservoir model of the deep and fracture‐controlled Upper Jurassic carbonates in the North Alpine Foreland Basin is generated in this work. An efficient methodology is developed to numerically simulate the coupled reservoir processes of fluid flow, heat transport and thermoporoelastic stresses resulting from possible geothermal doublet operating schemes with cold fluid injection and production profiles in an enhanced naturally fractured reservoir. A variety of numerical experiments is conducted to study the reactivation potential and dilation tendency of the fracture and fault system. Simulation results show the spatiotemporal evolution of the thermoporoelastic stresses and the zone affected after 50 years of geothermal doublet operation. From these simulations, the thermoelastic response of a geothermal doublet operating with 60 °C fluid injection temperature and 20 l/s flow rate translates into a maximum induced thermal stress of around 49.4 MPa near the injection well. In terms of a long‐term reservoir performance and fault and fracture reactivation potential, the findings reveal a negligible risk to a sustainable geothermal doublet operation.

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Section: Geomechanical Modelsupporting

confidence: 94%

3D thermo‐hydro‐mechanical simulation of the behaviour of a naturally fractured petrothermal reservoir in deep Upper Jurassic carbonates of the Bavarian Molasse Basin – Case study Geretsried

Rioseco

Dussel

Moeck

2022

Geomechanics and Tunnelling

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“…Besides, a finite element method was used to establish the coupling model of seepage stress temperature chemistry in the process of injecting CO 2 into the formation by Yin et al (2011). Luo et al (2015) gave a semi-analytical model of temperaturestress coupling in the process of geothermal exploitation. Based on the fluid-solid coupling theory, Yao and Liu (2015) analyzed the stress and deformation near the wellbore with water flooding.…”

Section: Introductionmentioning

confidence: 99%

Fluid-Solid Coupling Analysis on Evolution of In-Situ Stress Field by Water Injection in Oilfield

Liu

Zheng

Zhang

et al. 2017

American Journal of Engineering and Applied Sciences

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Water injection in oilfield may break initial balance of reservoir and lead to re-distribute of stress and deformation of strata. For further research of the evolution characteristics of in-situ field by water injection, the influence on reservoir by water injection was analyzed and different variables were set to study the effects of depth, injection-withdraw ratio and elastic modulus on strain and stress of strata based on fluid-solid coupling theory. Research shows that: As the water injection, the formation pressure around injection well is greater than that of the production well and the effective stress around injection well is less than that of production well. The deeper the formation is, the smaller the normal strain and vertical displacement are. Besides, the largest shear strain is on the top of reservoir, while the smallest is in central reservoir and different injection-withdraw ratios have significant influence on formation pressure. Elastic modulus mainly influences the deformation of the formation and deformation size is negatively related to the elastic modulus. This study provides a reference for casing damage under the effect of water injection.

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“…Induced seismicity is one of the possible georisks of underground operations such as EGS (Schmittbuhl et al 2014). Luo et al (2015b) investigate the Unterhaching geothermal site near Munich (Germany), where several micro-seismic events have been observed. One of the possible reasons for the observed micro-seismic events could be the reinjection of cold water into the hotter underground by stress redistribution and shear failures in the formations around and near the injection wellbore Uha GT-2.…”

mentioning

confidence: 99%

Subsurface energy systems in China: production, storage and conversion

et al. 2015

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Development of a semi-analytical method to calculate depth-dependent temperature and stress changes: investigation of micro-seismicity at Unterhaching Uha GT-2 geothermal well

Cited by 4 publications

References 19 publications

3D thermo‐hydro‐mechanical simulation of the behaviour of a naturally fractured petrothermal reservoir in deep Upper Jurassic carbonates of the Bavarian Molasse Basin – Case study Geretsried

3D thermo‐hydro‐mechanical simulation of the behaviour of a naturally fractured petrothermal reservoir in deep Upper Jurassic carbonates of the Bavarian Molasse Basin – Case study Geretsried

Fluid-Solid Coupling Analysis on Evolution of In-Situ Stress Field by Water Injection in Oilfield

Subsurface energy systems in China: production, storage and conversion

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