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Impact of Well Placement in the Fractured Geothermal Reservoirs Based on Available Discrete Fractured System

Mahmoodpour, Saeed ; Singh, Mrityunjay ; Bär, Kristian ; Sass, Ingo (2022):
Impact of Well Placement in the Fractured Geothermal Reservoirs Based on Available Discrete Fractured System. (Publisher's Version)
In: Geosciences, 12 (1), MDPI, ISSN 2076-3263,
DOI: 10.26083/tuprints-00020806,
[Article]

Abstract

Well placement in a given geological setting for a fractured geothermal reservoir is necessary for enhanced geothermal operations. High computational cost associated with the framework of fully coupled thermo-hydraulic-mechanical (THM) processes in a fractured reservoir simulation makes the well positioning a missing point in developing a field-scale investigation. To enhance the knowledge of well placement for different working fluids, we present the importance of this topic by examining different injection-production well (doublet) positions in a given fracture network using coupled THM numerical simulations. Results of this study are examined through the thermal breakthrough time, mass flux, and the energy extraction potential to assess the impact of well position in a twodimensional reservoir framework. Almost ten times the difference between the final amount of heat extraction is observed for different well positions but with the same well spacing and geological characteristics. Furthermore, the stress field is a strong function of well position that is important concerning the possibility of high-stress development. The objective of this work is to exemplify the importance of fracture connectivity and density near the wellbores, and from the simulated cases, it is sufficient to understand this for both the working fluids. Based on the result, the production well position search in the future will be reduced to the high-density fracture area, and it will make the optimization process according to the THM mechanism computationally efficient and economical.

Item Type: Article
Erschienen: 2022
Creators: Mahmoodpour, Saeed ; Singh, Mrityunjay ; Bär, Kristian ; Sass, Ingo
Origin: Secondary publication via sponsored Golden Open Access
Status: Publisher's Version
Title: Impact of Well Placement in the Fractured Geothermal Reservoirs Based on Available Discrete Fractured System
Language: English
Abstract:

Well placement in a given geological setting for a fractured geothermal reservoir is necessary for enhanced geothermal operations. High computational cost associated with the framework of fully coupled thermo-hydraulic-mechanical (THM) processes in a fractured reservoir simulation makes the well positioning a missing point in developing a field-scale investigation. To enhance the knowledge of well placement for different working fluids, we present the importance of this topic by examining different injection-production well (doublet) positions in a given fracture network using coupled THM numerical simulations. Results of this study are examined through the thermal breakthrough time, mass flux, and the energy extraction potential to assess the impact of well position in a twodimensional reservoir framework. Almost ten times the difference between the final amount of heat extraction is observed for different well positions but with the same well spacing and geological characteristics. Furthermore, the stress field is a strong function of well position that is important concerning the possibility of high-stress development. The objective of this work is to exemplify the importance of fracture connectivity and density near the wellbores, and from the simulated cases, it is sufficient to understand this for both the working fluids. Based on the result, the production well position search in the future will be reduced to the high-density fracture area, and it will make the optimization process according to the THM mechanism computationally efficient and economical.

Journal or Publication Title: Geosciences
Journal Volume: 12
Issue Number: 1
Publisher: MDPI
Collation: 18 Seiten
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Earth Science
11 Department of Materials and Earth Sciences > Earth Science > Geothermal Science and Technology
Date Deposited: 04 Apr 2022 12:24
DOI: 10.26083/tuprints-00020806
URL / URN: https://tuprints.ulb.tu-darmstadt.de/20806
URN: urn:nbn:de:tuda-tuprints-208062
Additional Information:

Keywords: well placement; CO2-EGS; water-EGS; discrete fracture networks; THM modeling

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