NOTES FOR IMEX 2003.10
1. Peak storage requirements have been drastically reduced. For large 32-bit and large 64-bit versions the peak storage requirements are approximately one-half of what they where for 2002.10.
2. Support for very large 64-bit problems has been added and tested on problems up to 112,000,000 grid blocks.
3. For parallel IMEX, options are now available to use up to 16 processors for a single run.
4. The sector output, both to the ascii file and the SR2, now includes average P/Z values weighted according to both block pore volume and block hydrocarbon pore volume.
In order to use this feature, reservoir temperature must be defined (see *TRES) 5. Streamline output is enabled for display in results.
6. Gas condensate modeling capability has been added.
7. Scaling of relative permeability, capillary pressure and J function maximums (i.e.
Krw at irreducible oil, Krow at connate water, etc) has been included.
NEW KEYWORDS AND OPTIONS ADDED TO IMEX 2003.10 Input/Output Control
*OUTSRF GRID *STRMLN
This keyword enables the output of interblock velocities to allow Results3D to display Streamlines. See the results manual for more information on Streamline display. Due to the large size of the SR2 output, streamline display is not enabled when the *ALL output option is used with OUTSRF GRID. Streamline output must be explicitly requested.
*OUTPRN/OUTSRF *RES *KRWSCL *KROWSCL *PCWSCL *KRGSCL *KROGSCL
*PCGSCL
These keywords enable the output of initial relative permeability, capillary pressure and J function maximums.
*OUTPRN/OUTSRF *GRID *KRWSCL *KROWSCL *PCWSCL *KRGSCL *KROGSCL
*PCGSCL *RS *BO *EG *RV *DPP
These keywords enable the output of relative permeability, capillary pressure and J function maximums and the output of Rs, Bo, Eg, oil content Rv (for condensates) and dew point pressures (for condensates) in recurrent output. The relative permeability table maximums are only output at times other than the initial time if they are explicitly requested on the OUTPRN GRID or OUTSRF GRID keywords, the *ALL output option will not enable their output.
User's Guide IMEX Introduction • 23
*PSPLIT *ON
This keyword enables the output of surface production splits for black oil and condensate models. In a black oil model the gas production is split into gas at surface from solution gas in the reservoir and gas at surface from free gas in the reservoir.
In a condensate model, in addition to the splitting of the surface gas production, oil production is also split. Oil is split into oil from gas in the reservoir and oil from mobile oil in the reservoir.
Reservoir Description
*ISECTOR
*SECTORNAMES
These keywords enable an alternate method of entering sector information.
Use of these keywords may make sector data conversion to IMEX from other simulators more straightforward.
Once read into MODELBUILDER, these keywords are translated into SECTORARRAY keywords.
Component Properties
*MODEL *GASWATER_WITH_CONDENSATE
This keyword enables the gas water with condensate model.
*PVTCOND
This keyword signals the input of the main condensate PVT table. Saturated gas and condensate properties are entered in this table.
*BOT
This keyword enables the input of under saturated Bo. This allows the user to directly input Bo as a function of pressure and bubble point pressure.
*VOT
This keyword enables the input of under saturated oil viscosity. This allows the user to directly input oil viscosity as a function of pressure and bubble point pressure.
*EGUST/*BGUST/*ZGUST
These keywords enable the input of Gas Eg/Bg/Zg for pressures above the dew point when using the GASWATER_WITH_CONDENSATE option.
*VGUST
This keyword enables the input of Gas viscosity for pressures above the dew point when using the GASWATER_WITH_CONDENSATE option.
24 • Introduction User's Guide IMEX
Rock-Fluid Data
*KRWIRO *KROCW *PCWMAX *JFWMAX *KRGCL *KROGCG *PCGMAX
*JFGMAX
These array keywords enable the input of relative permeability table maximums on a block by block basis in initial and recurrent data.
The user can now enter the values of Krw at irreducible oil, Krow at connate water, Pcow (or water J Function) at connate water, Krg at connate liquid, Krog at connate gas and Pcog (or gas J function) at connate liquid for each block.
This can be done both in the rock-fluid data section and in the recurrent data section.
Initial Conditions
*PDEW
*PDEWT
These keywords enable the input of initial block dew point pressures or initial dew point pressure versus depth tables for each PVT region. When using the GASWATER_WITH_CONDENSATE option initial dew point pressures must be defined.
Numerical
*NORM *PDW
*MAXCHANGE *PDW
These keywords enable the input of time stepping control based on the changes in dew point pressure during the previous time step. These
keywords can only be used with the GASWATER_WITH_CONDENSATE option.
*CONVERGE *MAXRES (*OIL|*WATER|*GAS|*OTHER|*SOLVENT|*POLYMER|
*LIGHTOIL)
These keywords enable the control of maximum residual based convergence tolerances by individual phase or component. This allows more precise control of a run. In addition, when a higher level of output information is selected (see *WPRN *ITER) each phase’s maximum residual error is displayed.
Well and Recurrent Data
*PTUBE *CONDENSATE
This keyword enables the use of condensate tubing head pressure tables.
These tables can be used with the GASWATER_WITH_CONDENSATE option.
User's Guide IMEX Introduction • 25