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Assessment of Geothermal Well Productivity Improvement Technologies: an Overview from the DEEPEGS Project

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Résumé

The H2020-DEEPEGS project aims to demonstrate the feasibility of the Enhanced/Engineered Geothermal System (EGS) Technology to produce electricity and/or heat. One of the main technological challenge is to optimize the well architecture and stimulation methods to get economically viable flow rate in deep hot reservoir initially little productive. The technologies are assessed for the two main demonstrators of the project: the IDDP-2/RN-15 Icelandic well and the VDH French doublet, taking into account the physical and geological specificities of each demonstrator. The IDDP-2/RN-15 well is located in the Reykjanes peninsula, in SW of Iceland. It crosses the fractured sheeted dyke complex around 4500 m TVD (True Vertical Depth), to reach a temperature estimated around 500°C-530°C. The assessment of stimulation methods is focused on the thermal (Peter-Borie et al., 2018) and hydraulic stimulations. The VDH doublet is located in the Upper Rhine Graben, in Eastern France. The target is a fault zone in the plutonic basement. The temperature around 4600 m TVD is estimated above 200°C. The initial injectivity/productivity index, below 1 l/s/bar, is far from the economically viable target. Several technologies are considered to enhance this index: the multi-drain well geometry and the hydraulic and thermal stimulations are assessed through numerical simulations.
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Dates et versions

hal-02320214 , version 1 (18-10-2019)

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  • HAL Id : hal-02320214 , version 1

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Mariane Peter-Borie, Annick Loschetter, Julie Maury. Assessment of Geothermal Well Productivity Improvement Technologies: an Overview from the DEEPEGS Project. 2019. ⟨hal-02320214⟩

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