An accurate PVT model for geothermal fluids as represented by H{sub 2}O-CO{sub 2}-NaCl mixtures

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Estimates for the pressure decline in high TDS geothermal fluids containing dissolved gases are extremely sensitive to the PVT representation of the reservoir fluid. Significant errors in predicted pressures will occur if the geothermal fluid is represented by one or two pseudo components with modified water properties. As a result, we have developed a PVT model to predict the thermodynamic properties of a prototype geothermal fluid as represented by three-component H{sub 2}O-CO{sub 2}-NaCl mixtures. The range of applicability of the model is: Temperatures from 75 to 700+ F, pressures from 14.7 to 5000 psi, carbon dioxide content from 0-5 wt%, ... continued below

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239-248

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Andersen, G.; Probst, A.; Murray, L. & Butler, S. January 1, 1992.

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Estimates for the pressure decline in high TDS geothermal fluids containing dissolved gases are extremely sensitive to the PVT representation of the reservoir fluid. Significant errors in predicted pressures will occur if the geothermal fluid is represented by one or two pseudo components with modified water properties. As a result, we have developed a PVT model to predict the thermodynamic properties of a prototype geothermal fluid as represented by three-component H{sub 2}O-CO{sub 2}-NaCl mixtures. The range of applicability of the model is: Temperatures from 75 to 700+ F, pressures from 14.7 to 5000 psi, carbon dioxide content from 0-5 wt%, and salt concentrations to 30 wt%. The model has been implemented into Unocal's version of a commercially available reservoir simulator and is currently being used to study one of Unocal's high salinity reservoirs located in the Imperial Valley of California.

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239-248

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  • Seventeenth Workshop on Geothermal Reservoir Engineering: Proceedings, Stanford University, Stanford, CA, January 29-31, 1992

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  • Report No.: SGP-TR-141-35
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 888733
  • Archival Resource Key: ark:/67531/metadc885359

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Office of Scientific & Technical Information Technical Reports

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  • January 1, 1992

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 2, 2016, 7:05 p.m.

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Andersen, G.; Probst, A.; Murray, L. & Butler, S. An accurate PVT model for geothermal fluids as represented by H{sub 2}O-CO{sub 2}-NaCl mixtures, article, January 1, 1992; United States. (digital.library.unt.edu/ark:/67531/metadc885359/: accessed September 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.