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Abstract

Summary

To assess the possibility of repurposing wells in the NGB as dBHEs, we created numerical models of two typical geological settings of the NGB and two different completion schemes, and simulated thermal performance over a lifetime of 30 years. Heat extraction rates range from 200 kW to 400 kW, with maximum values of up to 600 kW. Thermal output is mostly impacted by flow rate, injection temperature, and the final depths of re-completion.

We mapped the heat demand around two exemplary boreholes, and simulated possible heating grids. Initial production costs are comparable to other renewable energy resources like biomass and-depending on the distance between source and user – competitive against current gas prices. Additionally, it is a renewable heat source supplying energy over 8000 h per year independent of the energy market.

An insulated vacuum tubing with a low thermal conductivity of 0.02 W/(m*K) would increase the efficiency of recompleting idle wells to use the geothermal resources. This project highlights the major potential of usable geothermal resources in already installed deep wells, with havingalmost no geological risk, as the concept is independent of reservoir uncertainties like permeability and reservoir fluid composition, and drilling risks are skipped completely.

© EAGE Publications BV
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/content/papers/10.3997/2214-4609.2023101222
2023-06-05
2026-03-07

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References

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/content/papers/10.3997/2214-4609.2023101222
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Repurposing idle wells from gas fields in the North German Basin into deep borehole heat exchangers
Conference Proceedings 2023, 1 (2023); https://doi.org/10.3997/2214-4609.2023101222
/content/papers/10.3997/2214-4609.2023101222
/content/papers/10.3997/2214-4609.2023101222
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