Injection Experiments in Low-Temperature Geothermal Areas in Iceland
- Key words
- injection experiments, low-temperature systems, fractured rocks, tracer flow models, water temperature predictions
- Location
- Gata, Iceland; Lugaland, Iceland; Urrioavatn, Iceland; Thelamork, Iceland
- Conference
- World Geothermal Congress
- Year
- 1995
- Session
- SECTION 8 - Injection Technology
- Language
- English
- Paper number
- 3-axelsson
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Abstract
It is anticipated that injection will soon become an integral part of the management of low-temperature ( I50 geothermal systems in Iceland. These systems are embedded in fractured basaltic rocks and most of the thermal energy in the systems is stored in the rock matrix. Cold water injection will counteract the pressure draw-down due to production as well as extract some of this thermal energy. Injection experiments have been carried out in several low-temperature areas. During the experiments, connections between possible injection wells and production wells were investigated by tracers-tests. data from the were analyzed by simple models, which in turn were used to predict the of long-term injection. The results indicate that in some cases substantial cold water injection will be advantageous, whereas in other cases only limited injection of warm rather than cold water will be feasible
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