Singh, Mrityunjay ; Mahmoodpour, Saeed ; Bär, Kristian ; Sass, Ingo (2024)
Heat Extraction in Geothermal Systems with Variable Thermo-Poroelastic Fracture Apertures.
In: Geotechnics, 2023, 3 (4)
doi: 10.26083/tuprints-00027233
Artikel, Zweitveröffentlichung, Verlagsversion
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Kurzbeschreibung (Abstract)
The fracture network largely determines the efficiency of heat extraction from fractured geothermal reservoirs. Fracture openings are influenced by thermo-poroelastic stresses during cold fluid flow, with the interplay between fracture length and fracture opening regulating heat transfer. The lack of field data concerning fluctuating fracture openings underscores the necessity for computational models. This work emphasizes the impact of such gaps in the literature. Factors such as temperature, pressure, stress, thermal breakthrough time, and cumulative energy are evaluated to analyze the system’s behavior. A sensitivity analysis is employed to ascertain the significance of stress on fracture opening, compared with thermo-hydraulic behavior. The results show that stress field alterations, due to intersections with minor fractures, can cause up to a 15% variation in the largest fracture’s opening. The impact of thermoelastic stress outweighs the impact of poroelastic stress approximately threefold. Such stress-induced variations in fracture openings can lead to an up to 30% increase in cumulative heat extraction, while the drop in production temperature is limited to around 50%.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2024 |
| Autor(en): | Singh, Mrityunjay ; Mahmoodpour, Saeed ; Bär, Kristian ; Sass, Ingo |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | Heat Extraction in Geothermal Systems with Variable Thermo-Poroelastic Fracture Apertures |
| Sprache: | Englisch |
| Publikationsjahr: | 7 Mai 2024 |
| Ort: | Darmstadt |
| Publikationsdatum der Erstveröffentlichung: | 3 November 2023 |
| Ort der Erstveröffentlichung: | Basel |
| Verlag: | MDPI |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Geotechnics |
| Jahrgang/Volume einer Zeitschrift: | 3 |
| (Heft-)Nummer: | 4 |
| DOI: | 10.26083/tuprints-00027233 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/27233 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichung DeepGreen |
| Kurzbeschreibung (Abstract): | The fracture network largely determines the efficiency of heat extraction from fractured geothermal reservoirs. Fracture openings are influenced by thermo-poroelastic stresses during cold fluid flow, with the interplay between fracture length and fracture opening regulating heat transfer. The lack of field data concerning fluctuating fracture openings underscores the necessity for computational models. This work emphasizes the impact of such gaps in the literature. Factors such as temperature, pressure, stress, thermal breakthrough time, and cumulative energy are evaluated to analyze the system’s behavior. A sensitivity analysis is employed to ascertain the significance of stress on fracture opening, compared with thermo-hydraulic behavior. The results show that stress field alterations, due to intersections with minor fractures, can cause up to a 15% variation in the largest fracture’s opening. The impact of thermoelastic stress outweighs the impact of poroelastic stress approximately threefold. Such stress-induced variations in fracture openings can lead to an up to 30% increase in cumulative heat extraction, while the drop in production temperature is limited to around 50%. |
| Freie Schlagworte: | discrete fracture network, thermo-hydro-mechanical modeling, fracture aperture variation |
| Status: | Verlagsversion |
| URN: | urn:nbn:de:tuda-tuprints-272338 |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften > Fachgebiet Angewandte Geothermie |
| Hinterlegungsdatum: | 07 Mai 2024 12:52 |
| Letzte Änderung: | 08 Mai 2024 07:47 |
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| Suche nach Titel in: | TUfind oder in Google |
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- Heat Extraction in Geothermal Systems with Variable Thermo-Poroelastic Fracture Apertures. (deposited 07 Mai 2024 12:52) [Gegenwärtig angezeigt]
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