`DR`

Recognised by the OPM Flow parserGRID

DR defines the size of all grid blocks in the R direction via an array for each cell in the model. The RADIAL or SPIDER keyword in the RUNSPEC section should be activated to indicate that radial or spider geometry is being used.

This keyword is not supported by OPM Flow but would change the results if supported so the simulation will be stopped.

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 first layer (K=1) must always be fully defined; however, subsequent layers may be default and if defaulted they will take the values from the layer above.

The keyword is terminated by a “/”.

Note that the SPIDER keyword activates OPM Flow’s radial grid geometry option for the model. This keyword will create a spiderweb-shaped grid based on a corner-point grid using the standard radial grid keywords: INRAD, DRV, DTHETAV, DZ/DZV etc. in the GRID the section. Spider and Radial grids generated by OPM Flow will be displayed the same in OPM ResInsight, as they are both output as Cartesian Irregular Corner-Point Grids. The difference is that the radial model’s pore volumes are adjusted to match the radial geometry pore volumes, whereas the Spider grid volumes are not adjusted.

See also the DRV, DTHETAV, DZ and TOPS keywords in the GRID section to fully define a radial or spider grid model.

Records: An array of values covering the grid

Parameters

No.	Name	Description	Field	Metric	Lab	Default
1	`DR`	DR is an array of real numbers describing the cell size in the R direction for each cell in the model in a radial grid. Repeat counts may be used, for example 10*100.0.	feet	m	cm	None

Example

Given the dimensions of the grid in the RUNSPEC section to be 10,1, 8 for NX, NY and NZ respectively, we first define the inner radius of the radial model,
--
-- INNER RADIUS OF FIRST GRID BLOCK IN THE RADIAL DIRECTION
--
INRAD
0.25
/
and then DR should be defined as:
--
-- DEFINE GRID BLOCK R DIRECTION CELL SIZE
--
DR
1.75 2.32 5.01 10.84 23.39 50.55 109.21 235.92 509.68 1101.0
1.75 2.32 5.01 10.84 23.39 50.55 109.21 235.92 509.68 1101.0
1.75 2.32 5.01 10.84 23.39 50.55 109.21 235.92 509.68 1101.0
1.75 2.32 5.01 10.84 23.39 50.55 109.21 235.92 509.68 1101.0
1.75 2.32 5.01 10.84 23.39 50.55 109.21 235.92 509.68 1101.0
1.75 2.32 5.01 10.84 23.39 50.55 109.21 235.92 509.68 1101.0
1.75 2.32 5.01 10.84 23.39 50.55 109.21 235.92 509.68 1101.0
1.75 2.32 5.01 10.84 23.39 50.55 109.21 235.92 509.68 1101.0
/
The above example defines the size of the cells in the R direction based on 80 cells in the model as defined by the DIMENS keyword in the RUNSPEC section.
Note that since the first layer (K=1) must be defined and subsequent layers default to the layer above then:
--
-- INNER RADIUS OF FIRST GRID BLOCK IN THE RADIAL DIRECTION
--
INRAD
0.25
/
--
-- DEFINE GRID BLOCK R DIRECTION CELL SIZE
--
DR
1.75 2.32 5.01 10.84 23.39 50.55 109.21 235.92 509.68 1101.0
/
is equivalent to previous example.

Manual source: parts/chapters/subsections/6.3/DR.fodt