Objective
To demonstrate that water injected into a naturally fractured geothermal reservoir through production wells in such a way that the overall extraction of the heat energy from the reservoir will increase.
To demonstrate the improvement in mining efficiency achieved by applying the reinjection method in geothermal exploitation. To show a technical and economical feasibility of using reinjection as a production method in low temperature geothermal utilization in Iceland.
Reinjection is continuing at a rate of 8-20 l/s. Comprehensive monitoring is on-going. Preliminary results are positive.
Laugaland is the largest of five low-temperature geothermal fields utilized for district-heating in the town of Akureyri in Central N-Iceland. It is located 13 km south of Akureyri and has been utilized since 1977. Because of the low overall permeability of the Laugaland system, the relatively modest production has lead to a great pressure drawdown and limited productivity. This drawdown continues to increase with time if constant rate production is maintained. Because of the nature of the Laugaland system, it is ideal for testing how injection can improve the productivity of low permeability geothermal systems in fractured volcanic rock. A two week injection test at relatively low injection rate, carried out in 1991, showed that the injected water diffused into a very large volume, which reflects conditions favorable for injection. A long term test with high injection rate is, however, needed to determine the feasibility of the project.
Return water from the district heating system in Akureyri is the most suitable fluid for the injection, because it has the same chemical composition as the reservoir fluid. Therefore, a 13 km pipeline from the market in Akureyri to the geothermal field at Laugaland will be constructed. The temperature of the return water is 15-30 deg. C, and up to 20 l/s will be injected back into the reservoir. Two existing wells will be used for the injection and injection pressures up 3 MPa are expected.
Reinjection of the return water will be operated for two years and the technical and the economical feasibility of this production method evaluated. The effect of injection on reservoir conditions will be monitored carefully both by measurements of traditional reservoir parameters as well as applying an advanced seismic network (SIL). Extensive reservoir and seismic models will be applied for interpretation of data and presentation of results.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- engineering and technology mechanical engineering thermodynamic engineering
- social sciences economics and business economics production economics productivity
- engineering and technology environmental engineering energy and fuels renewable energy geothermal energy
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Coordinator
600 AKUREYRI
Iceland
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