Title: Techno-economic performance optimization of hydrothermal doublet systems: Application to the Al Wajh basin, Western Saudi Arabia
Authors: Ezekiel, Justin
Ebigbo, Anozie  
Arifianto, Indra
Daniilidis, Alexandros
Finkbeiner, Thomas
Mai, P. Martin
Language: eng
Keywords: Hydrothermal systems;Levelized cost of heating (LCOH);Techno-economic optimization;Thermoelastic fracture;Transmissivity;Western Saudi Arabia
Issue Date: 1-Nov-2022
Document Type: Article
Journal / Series / Working Paper (HSU): Geothermics
Volume: 105
The Kingdom of Saudi Arabia (KSA) has vast geothermal energy resources. When developed, these markedly strengthen the country's goals of achieving a carbon-neutral economy. To demonstrate the feasibility and techno-economic performance of small-scale, hydrothermal well doublet systems for direct use in KSA, we perform reservoir and wellbore flow and heat-transport simulations as well as an economic analysis. The maximum permissible flowrate is constrained to avoid thermoelastic fracturing in the near-wellbore region. Reservoir conditions of a sedimentary basin along the Red Sea coast (near Al Wajh) provide an ideal study case to which we add economic parameters considered representative for KSA. We derive a Levelized Cost of Heat (LCOH) ranging from 49 to 128 $/MWh for 50-mD hydrothermal doublet systems with an optimal well spacing of 600 m and a flowrate ranging from 110 kg/s to 50 kg/s. LCOH is strongly influenced by decreasing reservoir transmissivity. Also, a minimum injection temperature is required to avoid thermoelastic fracturing. Our economic analysis further highlights that capacity factor and well-drilling cost have the greatest impact on LCOH. Thus, this study provides a guide and workflow to conduct techno-economic investigations for decision-making, risk mitigation, optimizing geothermal-energy-extraction and economic-performance conditions of hydrothermal doublet systems.
Organization Units (connected with the publication): Hydromechanik 
ISSN: 03756505
Publisher DOI: 10.1016/j.geothermics.2022.102532
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