ECO2N V2.0: A TOUGH2 fluid property module for modeling CO 2 ‐H 2 O‐NACL systems to elevated temperatures of up to 300°C

Lehua Pan, Nicolas Spycher, Christine Doughty and Karsten Pruess

Greenhouse Gases: Science and Technology, 2017, vol. 7, issue 2, 313-327

Abstract: We have improved ECO2N, the TOUGH2 fluid property module of the CO 2 ‐H 2 O‐NaCl system. The major enhancements include: (i) the upper temperature limit is increased from 110 to about 300°C; (ii) the thermophysical properties of the CO 2 ‐rich phase are more accurately calculated as a non‐ideal mixture of CO 2 and H 2 O; (iii) the approach to calculate the specific enthalpy of dissolved CO 2 has been improved to make the code more robust in modeling phase transitions under non‐isothermal conditions; and (iv) more sophisticated models for effective heat conductivity of formations saturated with supercritical CO 2 have been provided. The new module includes a comprehensive description of the thermodynamic and thermophysical properties of H 2 O NaCl CO 2 mixtures, that reproduces fluid properties largely within experimental error for the temperature, pressure and salinity conditions 10°C > T > 300°C, P > 600 bar, and salinity up to halite saturation. This includes density, viscosity, and specific enthalpy of fluid phases as functions of temperature, pressure, and composition, as well as partitioning of mass components H 2 O, NaCl and CO 2 among the different phases. ECO2N with the TOUGH2 reservoir simulator can be applied to a wide range of problems in geologic sequestration of CO 2 in saline aquifers, and in enhanced geothermal reservoirs. ECO2N can describe both sub‐ and supercritical states of CO 2 , but applications that involve subcritical conditions are limited to systems in which there is no change of phase between liquid and gaseous CO 2 , and in which no mixtures of liquid and gaseous CO 2 occur. © 2016 Society of Chemical Industry and John Wiley & Sons, Ltd.

Date: 2017
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