A new release of PetraSim/TOUGH2 includes updated fluid thermodynamics calculations and improvements related to flow processes and the treatment of production wells. While some of the improvements are applicable to all the TOUGH2 EOS modules supported by PetraSim 2016, the primary focus is the EOS modules customarily used for the modelling of geothermal reservoirs, i.e. EOS1 for pure water, EOS2 for water-CO2 mixtures, and EWASG for ternary H2O-CO2-NaCl mixtures. Improvements to the TOUGH2 V.2.0 code (Pruess et al., 1999) include: the use of IAPWS-IF97 and IAPWS 2008 correlations for water and steam; additional correlations for brine and halite properties in EWASG; for EOS2 and EWASG a new dependence of aqueous phase density on dissolved NCG concentration and a new option to calculate the enthalpy contribution of dissolved NCG to aqueous phase enthalpy; for EOS2 new options for CO2 density calculations; and improvements to numerical implementation of the van Genuchten capillary pressure function. The PetraSim interface supports these new options. In addition, there are new capabilities for production wells that include: PI specified for each layer for wells completed on multiple layers, wells on deliverability activated at specific times, and optional input of a pre-calculated flowing wellbore pressure profile. PetraSim/TOUGH2 applications are presented to demonstrate the use and advantages of modifications included in TOUGH2, its EOS modules and in the PetraSim pre- and post-processing interface to TOUGH2.

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