Release notes

PFLOTRAN-OGS-1.6

Introduction

The OGS 1.6 version of PFLOTRAN is the sixth in a series of releases designed to support reservoir engineering required for carbon dioxide capture and storage (CCS). Compared to the previous OGS 1.5 version of PFLOTRAN, the main new elements are:

  • New component equation of state mode (COMP) and multigas modes COMP3 and COMP4, for simulation of CO2 storage into depleted hydrocarbon fields.

  • New local mesh refinement options (CARFIN) and the ability to complete wells within local refinements (CIJKL_D)

  • Changes to the treatment of surface density in brine-type water PVT models like WATERTAB. See Density and viscosity dependence on salinity.

  • Input arrays of the type *NUM (e.g. SATNUM, IMBNUM) are now written to the INIT output file as integer*4, unlike 1.5 where they were written as real*4

  • New EQUILIBRATION card that simplifies the input to initialise a study.

  • Support of DATES in ECLIPSE_FILE to request report times in by a calendar format (DD-MMM-YYYY).

  • Support for .EGRID grid, in input and output, see GDFILE and ECLIPSE_FILE.

  • Improvement of MATERIAL_PROPERTY, where is now possible to skip thermal property for isothermal run, and specifying units.

  • Many bug fixes, and convergence improvement for the GAS_WATER mode.

  • Compatibility with Ubuntu 20.04.

Back-Compatibility

  • Input arrays of the type *NUM (e.g. SATNUM, IMBNUM) are now written as integer*4, unlike 1.5 where they were written as real*4

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

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.