TH
T. Hornes
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1
Conference paper
(2026)
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M. Knott, R. Cox, T. Hornes, L. Kuusik, E. Meen Hidalgo-Chacón, J.D. Jansen, M. Matsumoto, S. Ragnarsson, S. Geiger
Operational instability in high-enthalpy geothermal wells remains a key challenge for sustainable energy production, particularly in fractured volcanic reservoirs such as those frequently found in Iceland. This work investigates pressure and flow rate oscillations observed in production wells at the Hengill geothermal area, with a central focus on the Multiple Feed Zone theory as the dominant explanatory framework. This extended abstract synthesises the main findings of the conducted study on well oscillating phenomena, analysed through conceptual models, well data interpretation, and numerical simulations. The results demonstrate that interactions between feed zones of differing pressure, temperature, and permeability can induce self-sustained oscillations without requiring classical internal flow instability mechanisms. These findings have significant implications for well design, monitoring, and control strategies in high-enthalpy geothermal systems.
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Operational instability in high-enthalpy geothermal wells remains a key challenge for sustainable energy production, particularly in fractured volcanic reservoirs such as those frequently found in Iceland. This work investigates pressure and flow rate oscillations observed in production wells at the Hengill geothermal area, with a central focus on the Multiple Feed Zone theory as the dominant explanatory framework. This extended abstract synthesises the main findings of the conducted study on well oscillating phenomena, analysed through conceptual models, well data interpretation, and numerical simulations. The results demonstrate that interactions between feed zones of differing pressure, temperature, and permeability can induce self-sustained oscillations without requiring classical internal flow instability mechanisms. These findings have significant implications for well design, monitoring, and control strategies in high-enthalpy geothermal systems.