The Real Gas Pseudo Pressure for Geothermal Steam -- Summary Report

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The producing characteristics of vapor-dominated geothermal steam reservoirs bear some strong resemblances to those observed in hydrocarbon natural gas reservoirs. Consequently, many geothermal steam well tests are commonly analyzed using flow theory developed for the isothermal flow of hydrocarbon natural gases. Such analysis is most often made using the idealization of perfect gas fluid flow behavior in the reservoir. This study investigated the real gas flow characteristics of geothermal steam over the ranges of pressure, temperature, and noncondensable gas content commonly found in vapor dominated geothermal systems. Details of this study are available elsewhere (Mannon, 1977). These results will allow ... continued below

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29-35

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Mannon, L.S. & Atkinson, P.G December 14, 1977.

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Description

The producing characteristics of vapor-dominated geothermal steam reservoirs bear some strong resemblances to those observed in hydrocarbon natural gas reservoirs. Consequently, many geothermal steam well tests are commonly analyzed using flow theory developed for the isothermal flow of hydrocarbon natural gases. Such analysis is most often made using the idealization of perfect gas fluid flow behavior in the reservoir. This study investigated the real gas flow characteristics of geothermal steam over the ranges of pressure, temperature, and noncondensable gas content commonly found in vapor dominated geothermal systems. Details of this study are available elsewhere (Mannon, 1977). These results will allow the reservoir engineer to more accurately analyze transient flow of superheated geothermal steams. Geothermal steam wells have traditionally been analyzed using the ideal gas flow model, described by Eq. 1, without quantitative justification. The results of this study will allow for quantitative justification of the ideal gas flow assumption, where possible. Alternatively, they will facilitate use of the more correct pseudo-pressure function when analyzing geothermal steam wells. 5 refs., 2 tabs., 2 figs.

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29-35

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  • Proceedings, Third Workshop Geothermal Reservoir Engineering, Stanford University, Stanford, CA, Dec. 14-15, 1977

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  • Report No.: SGP-TR-25-5
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 888808
  • Archival Resource Key: ark:/67531/metadc885307

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  • December 14, 1977

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 1, 2016, 1:34 p.m.

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Mannon, L.S. & Atkinson, P.G. The Real Gas Pseudo Pressure for Geothermal Steam -- Summary Report, article, December 14, 1977; United States. (digital.library.unt.edu/ark:/67531/metadc885307/: accessed August 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.