Accounting for the effect of TDS and NCG on Salton Sea reservoir response

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Description

The Salton Sea reservoir, located in Imperial County, Ca., is unique in several ways from most liquid-dominated geothermal reservoirs that have been developed to date. One of these differences is the presence of hyper-saline brines containing up to 28% TDS (Total Dissolved Solids) and up to 0.2% NCG (Non-Condensible Gas). A simple material and energy balance model has been developed to study the effect of TDS and NCG on Salton Sea reservoir response. This study demonstrated that during the development of a two-phase system the partitioning of the NCG into the vapor phase and the consequential concentration of the TDS ... continued below

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249-251

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Butler, Steven J. January 1, 1992.

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Description

The Salton Sea reservoir, located in Imperial County, Ca., is unique in several ways from most liquid-dominated geothermal reservoirs that have been developed to date. One of these differences is the presence of hyper-saline brines containing up to 28% TDS (Total Dissolved Solids) and up to 0.2% NCG (Non-Condensible Gas). A simple material and energy balance model has been developed to study the effect of TDS and NCG on Salton Sea reservoir response. This study demonstrated that during the development of a two-phase system the partitioning of the NCG into the vapor phase and the consequential concentration of the TDS in the brine drastically alters the reservoir fluid properties. In modeling pressure depletion of hyper-saline reservoirs, such as the Salton Sea, these changes in reservoir fluid composition were shown to seriously affect the simulation results. As a result of these findings, a compositional fluid property package was developed using published data on H{sub 2}O-CO{sub 2}-NaCl mixtures. This fluid property package was then incorporated into the simulation program used by Unocal. Validation of the fluid property package in this simulation program was made using measured reservoir temperature, surface enthalpy, and surface flash data. The development of a compositional simulation program for geothermal applications has advanced our ability to study depletion mechanisms that are sensitive to compositional changes. This program is currently being used to study the effect of injection and steam cap development on long term operations and to develop a field model of the Salton Sea reservoir.

Physical Description

249-251

Source

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

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  • Report No.: SGP-TR-141-36
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 888734
  • Archival Resource Key: ark:/67531/metadc885417

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  • January 1, 1992

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 2, 2016, 7:04 p.m.

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Butler, Steven J. Accounting for the effect of TDS and NCG on Salton Sea reservoir response, article, January 1, 1992; United States. (digital.library.unt.edu/ark:/67531/metadc885417/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.