Accurate Evaluation of Thermodynamic Properties of Geothermal Gases from an Equation of State with Field Applications
- Key words
- Equation of state, geothermal gases, thermodynamic properties, gas solubility, CO2
- Conference
- Western Pacific Regional Branch
- Year
- 2011
- Language
- English
Full text
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Abstract
The equation of state (EOS) developed by Duan and co-workers has been adopted and proposed for calculating thermodynamic properties of geothermal gases. A spreadsheet-based simple calculation method is described, and sample calculations of compressibility, fugacity coefficients, gas partitioning coefficients and gas solubility in brines and its effects on the boiling curve of geothermal fluids are presented. Calculations of the solubility of the most important geothermal gas, CO2, in brines of some Philippine geothermal fields are shown to demonstrate insights gained on well and reservoir processes.
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