Effects of Hydrothermal Chemistry on Reservoir Evolution

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Although the corrosion and scaling problems associated with handling geothermal fluids are well known, the effects of hydrothermal reactions are often overlooked in geothermal reservoir modeling. Water-rock chemistry can be expected to affect the evolution of a reservoir in at least three ways: (a) the heats of reaction may contribute directly to the energy production, (b) the viscosity and thermodynamic properties of water are affected by the dissolved solids—this is especially important in two-phase regimes, and (c) the porosity and permeability change with time due to dissolving and precipitation as well as due to the volume change associated with alteration. ... continued below

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34-39

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Sammis, Charles G.; Li, Todd M.C. & Downs, William F. December 1, 1976.

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Description

Although the corrosion and scaling problems associated with handling geothermal fluids are well known, the effects of hydrothermal reactions are often overlooked in geothermal reservoir modeling. Water-rock chemistry can be expected to affect the evolution of a reservoir in at least three ways: (a) the heats of reaction may contribute directly to the energy production, (b) the viscosity and thermodynamic properties of water are affected by the dissolved solids—this is especially important in two-phase regimes, and (c) the porosity and permeability change with time due to dissolving and precipitation as well as due to the volume change associated with alteration. In the case of alteration reactions, the reaction rate is not limited by solubility and, depending on the alteration rate, significant chemical energy may be extracted. One of the objectives of our experimental program is to determine alteration rates in typical reservoir rocks, and thus assess the importance of such reactions to the total thermal regime. The changes in porosity and permeability associated with both dissolving and alteration reactions are easily incorporated into standard finite difference schemes commonly used in numerical reservoir modeling; the paper illustrates this with a system of equations incorporating the dissolution and precipitation of SiO{sub 2}. Kinetics of these SiO{sub 2} reactions are briefly discussed. 6 refs., 2 tabs., 1 fig.

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34-39

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  • Proceedings Second Workshop Geothermal Reservoir Engineering, Stanford University, Stanford, Calif., December 1-3, 1976

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  • Report No.: SGP-TR-20-7
  • Grant Number: E043-326-PA-50
  • Office of Scientific & Technical Information Report Number: 887307
  • Archival Resource Key: ark:/67531/metadc885497

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • December 1, 1976

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 5, 2016, 2:42 p.m.

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Sammis, Charles G.; Li, Todd M.C. & Downs, William F. Effects of Hydrothermal Chemistry on Reservoir Evolution, article, December 1, 1976; United States. (digital.library.unt.edu/ark:/67531/metadc885497/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.