PVTNUM

Recognised by the OPM Flow parserREGIONS

The PVTNUM keyword defines the PVT region numbers for each grid block, as such there must be one entry for each cell in the model. The region number specifies which set of PVT tables (DENSITY, PVDG, PVDO, PVTG, PVTO, PVCO, PVTW and ROCK) are used to calculate the PVT properties in a grid block.

Notes:

The number of entries should correspond to the NX x NY x NZ parameters on the DIMENS keyword in the RUNSPEC section, unless the BOX keyword defines a sub area of the grid, in which case the total number of entries should correspond to the number of cells defined by the BOX statement.

The EQULNUM and PVTNUM arrays need to be consistent, that is the all cells with the same PVTNUM can only belong to one EQLNUM region.

If a cell is not assigned a PVTNUM region then the default value will be used.

The keyword is terminated by a “/”.

Note

Care should be taken that cells in different PVTNUM regions are not in communication, since the fluid properties are associated with a cell. If for example, a rbbl or a rm3 of oil flows from PVTNUM region 1 to PVTNUM region 2, then the oil properties of that oil will change from the PVT 1 data set to the PVT data set 2. This will result in material balance errors, that may or may not cause numerical issues.

To avoid this one should use the MULTNUM (or FLUXNUM, or OPERNUM) array with the MULTREGT array to ensure that the various PVTNUM regions are not in communication.

Records

An array of values covering the grid

Parameters

Example

The example below sets three PVTNUM regions for a 4 x 5 x 2 model.
--
-- DEFINE PVTNUM REGION FOR ALL CELLS
--
PVTNUM
2 2 1 1 2 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1
3 3 1 1 3 3 1 1 1 1 1 1 1 1 1 1 1 1 1 1
/
Alternatively the EQUALS keyword could be employed to accomplish the same task, that is:
--
-- ARRAY CONSTANT ---------- BOX ---------
-- I1 I2 J1 J2 K1 K2
EQUALS
PVTNUM 1 1* 1* 1* 1* 1* 1* / SET REGION 1
PVTNUM 2 1 2 1 2 1 1 / SET REGION 2
PVTNUM 3 1 2 1 2 2 2 / SET REGION 3
/
There third example shows how to ensure the various PVT regions are isolated. First of all define the MULTNUM array in the GRID section and ensure all the regions are isolated.
-- ==============================================================================
--
-- GRID SECTION
--
-- ==============================================================================
GRID
--
-- ARRAY CONSTANT ---------- BOX ---------
-- I1 I2 J1 J2 K1 K2
EQUALS
MULTNUM 1 1* 1* 1* 1* 1* 1* / SET REGION 1
MULTNUM 2 1 2 1 2 1 1 / SET REGION 2
MULTNUM 3 1 2 1 2 2 2 / SET REGION 3
/
--
-- SET TRANSMISSIBILITES ACROSS DIFFERENT RESERVOIRS TO ZERO TO ISOLATE
-- RESERVOIRS
--
-- REGION REGION TRANS DIREC NNC REGION ARRAY
-- FROM TO MULT OPT OPTS M / F / O
MULTREGT
1* 1* 0.0 1* 'ALL' M / ALL REGIONS SEALED
/
Then in the REGIONS section copy the MULTNUM array to the PVTNUM array.
-- ==============================================================================
--
-- REGIONS SECTION
--
-- ==============================================================================
REGIONS
--
-- COPY AN ARRAY TO ANOTHER ARRAY BASED ON A REGION NUMBER
--
-- ARRAY ARRAY REGION REGION ARRAY
-- FROM TO NUMBER M / F / O
COPYREG
MULTNUM PVTNUM 1 M / COPY MULT TO PVT 1
MULTNUM PVTNUM 2 M / COPY MULT TO PVT 2
MULTNUM PVTNUM 3 M / COPY MULT TO PVT 3
/
All the separate PVT regions are now isolated.
| Note Care should be taken that cells in different PVTNUM regions are not in communication, since the fluid properties are associated with a cell. If for example, a rbbl or a rm3 of oil flows from PVTNUM region 1 to PVTNUM region 2, then the oil properties of that oil will change from the PVT 1 data set to the PVT data set 2. This will result in material balance errors, that may or may not cause numerical issues. To avoid this one should use the MULTNUM (or FLUXNUM, or OPERNUM) array with the MULTREGT array to ensure that the various PVTNUM regions are not in communication. |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

Manual source: parts/chapters/subsections/9.3/PVTNUM.fodt