The OGS 1.5 version of PFLOTRAN is the fifth in a series of releases designed to support reservoir engineering required for carbon dioxide capture and storage (CCS). Compared to the previous OGS 1.4 version of PFLOTRAN, the main new elements are:
SALT_TABLE (SALTVD) to define salinity concentrations that vary with depth.
Salinity-dependent brine viscosity (Batzle and Wang [BW92]) in the GAS_WATER flow mode.
Field Gas Mass partition in the summary file to analyse the CO2 trapping mechanism (Structural, Solution and Residual trapping).
User-defined pressure-dependent miscibility function for the Solvent Todd-Longstaff model, via PMISC and MISC tables.
Introduction of grid block reporting (BPR, BTEMP, etc) in the summary file.
User-defined vertical resolution for hydrostatic equilibration computation.
By default, OGS-1.5 models the brine viscosity with the Batzle and Wang correlation to account for the dependence on salinity and temperature, while OGS-1.4 uses fresh water tables (i.e. salinity is not accounted for). Although Batzle and Wang used in OGS-1.5 reproduces accurately the zero-salinity cases, an option is made available to switch back to the viscosity model of OGS-1.4 (see WATER_VISCOSITY_NOSALT in SIMULATION_FLOW/OPTION).
In OGS-1.5, the FMIS card used to model the miscibility function required by the Solvent Todd-Longstaff model has been replaced by MISC. If the user enters FMIS an error is reported suggesting to use of MISC.
The OGS 1.4 version of PFLOTRAN is the fourth in a series of releases designed to support reservoir engineering required for carbon dioxide capture and storage (CCS).
Compared to the previous OGS 1.3 version of PFLOTRAN, the main new elements are:
Carter-Tracy aquifer model
Fixed-temperature thermal boundaries
An hysteresis model for relative permeability and capillary pressure
Introduction of well group control
Enhanced reporting: FLIP, mass balance, CO2 solution and residual trapping
The well model now support PI multiplier and variable drilling direction by completion
New default convergence criteria based on dimensionless residual, included in RESERVOIR_DEFAULT
NOGASSOL option to turn off the solution of gas in the aqueous phase