World Geothermal Congress 2020+1
March - October, 2021

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

Mariane Peter-Borie and DEEPEGS Team

[BRGM, France]

The H2020-DEEPEGS project aims to demonstrate the feasibility of the Enhanced/Engineered Geothermal System Technology to produce electricity and/or heat. One of the main technological challenge is to optimise 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 IDDP2/RN-15 Icelandic well and the VDH French doublet, taking into account the physical and geological specificities of each demonstrator. The IDDP2-RN15 well is located in the Reykjanes peninsula, in SW of Iceland. It crosses the fractured sheeted dyke complex until 4 659 m MD (around 4 500 m TVD) deep to reach a temperature estimated around 500°C-530°C (Friðleifsson et al. 2017). 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 granitic basement. The reached temperature at 5 408 m MD (around 4 600m 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 chemical, hydraulic and thermal stimulations are assessed through numerical simulation. This paper aims to provide an overview of the different technologies considered to enhance the productivity index of these demonstrators and of the choice of numerical approaches to assess their efficiency. Links to other papers detailing the numerical modelling will be done. Acknowledgement This study was part of the DEEPEGS project, which received funding from the European Union HORIZON 2020 research and innovation program under Grant agreement no. 690771. References Friðleifsson GO, Elders WA, Zierenberg RA, et al., 2017, The Iceland Deep Drilling Project 4.5 km deep well, IDDP-2, in the seawater-recharged Reykjanes geothermal field in SW Iceland has successfully reached its supercritical target. Sci. Drill. ;23:1–12. Peter-Borie M., A. Loschetter; I. A. Merciu; G. Kampfer; O. Sigurdsson, 2018, Borehole damaging under thermo-mechanical loading in the RN-15/IDDP-2 deep well: towards validation of numerical modeling using logging images, Geothermal Energy: Science, Society, and Technology, DOI: 10.1186/s40517-018-0102-7

        Topic: EGS - Enhanced Geothermal Systems Paper Number: 31025

         Session 16P: Poster 4 [Tuesday 6th July 2021, 11:00 pm] (UTC-8)
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