Lumped-parameter models for low-temperature geothermal fields and their application |
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Authors: | Hulya Sarak Mustafa Onur Abdurrahman Satman |
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Affiliation: | Petroleum and Natural Gas Engineering Department, Istanbul Technical University, 34469 Maslak, Istanbul, Turkey |
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Abstract: | The behavior of low-temperature geothermal reservoirs under exploitation is simulated using analytical lumped-parameter models. These models consider the effects of fluid production and reinjection, as well as natural recharge, on the pressures (or water levels) of low-temperature, liquid-dominated geothermal systems. The computed responses for constant production/injection flow rates are given in the form of analytical expressions. Variable flow rate cases are modeled, based on the Duhamel's principle. Reservoir parameters are obtained by applying a weighted nonlinear least-squares estimation technique in which measured field data are history matched to the corresponding model response. By using history-matched models, the future performance of the reservoir can be predicted for different production/injection scenarios in order to optimize the management of a given geothermal system.We demonstrate the applicability of the models by simulating measured data from the Laugarnes geothermal field in Iceland, and the Balcova–Narlidere field in Turkey. |
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Keywords: | Geothermal reservoirs Lumped-parameter models Analytical solutions Nonlinear parameter estimation Predictions Laugarnes Balcova– Narlidere |
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