Release notes

PFLOTRAN-OGS-1.5

Introduction

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.

  • New keywords ABOUT and PREAMBLE to control the amount of output to the screen and the .out file. Please see the corresponding sections for more information.

  • The negative direction transmissibility multiplier grid keywords MULTX-, MULTY- and MULTZ- are now supported. These will be modified by the X-, Y- and Z- face selections in the FAULTS keyword.

Back-Compatibility

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In OGS-1.5, the FMIS card used to model the miscibility function required by the Solvent Todd-Longstaff model has been replaced by MISC.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.

PFLOTRAN-OGS-1.4

Introduction

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

Back-compatibility

Units are now required for all well values such as reference depths.

RESERVOIR_DEFAULTS has been extended to set the STOL and ITOL non-linear convergence criteria and the maximum number of non-linear iterations.