Changes in thermodynamic conditions of the Ahuachapan Reservoir due to production and injection
- Earth Sciences Div., Lawrence Berkeley Lab., Berkeley, CA (US)
This paper reports that since large-scale exploitation of the Ahuachapan reservoir began in 1975 large changes in the reservoir thermodynamic conditions have occurred. Drawdown of up to 15 bars and significant temperature changes have been observed in the wellfield. Temperatures have declined due to boiling in the reservoir in response to the pressure drawdown; localized and minor cooling due to reinjection of spent geothermal fluids have also been observed. There are indications of cold fluid influx deep into the reservoir from the west and north. Reservoir temperatures show that a significant amount of hot fluid recharge comes to the wellfield from the southeast, and temperatures also indicate that the recharge rate has increased with time as pressure declines in the reservoir. Chemical analyses of the produced fluids show that most wells are fed by a mixture of geothermal fluids and cooler, less-saline waters. The cold water inflow has increased due to exploitation, as demonstrated by decreased salinity of the produced fluids.
- OSTI ID:
- 7239574
- Journal Information:
- Geothermics (International Journal of Geothermal Research and its Applications); (United States), Vol. 20:5; ISSN 0375-6505
- Country of Publication:
- United States
- Language:
- English
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