Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

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

Version 1 : Received: 10 October 2021 / Approved: 12 October 2021 / Online: 12 October 2021 (12:40:20 CEST)

A peer-reviewed article of this Preprint also exists.

Mahmoodpour, S.; Singh, M.; Bär, K.; Sass, I. Impact of Well Placement in the Fractured Geothermal Reservoirs Based on Available Discrete Fractured System. Geosciences 2022, 12, 19. Mahmoodpour, S.; Singh, M.; Bär, K.; Sass, I. Impact of Well Placement in the Fractured Geothermal Reservoirs Based on Available Discrete Fractured System. Geosciences 2022, 12, 19.

Journal reference: Geosciences 2022, 12, 19
DOI: 10.3390/geosciences12010019

Abstract

Well placement optimization in a given geological setting for a fractured geothermal reservoir is a prerequisite for enhanced geothermal operations. High computational cost associated in the framework of fully coupled thermo-hydraulic-mechanical (THM) processes in a fractured reservoir simulation, makes the well positioning as a missing point in developing a field scale investigation. Here, in this study, we shed light on this topic through examining different injection-production well (doublet) position in a given real fracture network. Water and CO2 are used as working fluids for geothermal operations and importance of well positions are examined using coupled THM numerical simulations for both the fluids. 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 two-dimensional reservoir framework. Almost ten times of the difference between the final amount of heat extraction is observed for different well position but with the same well spacing and geological characteristics. Furthermore, stress field is be a strong function of well position that is important with respect to the possibility of unwanted stress development. As part of the MEET project, this study recommends to perform similar well placement optimization study for each fracture set in a fully coupled THM manner before a field well drilling.

Keywords

Well placement; CO2-EGS; water-EGS; Discrete fracture networks; THM modeling

Subject

ENGINEERING, Energy & Fuel Technology

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