BCPROP

Recognised by the OPM Flow parserSCHEDULE

The BCPROP keyword defines the type and properties of the boundary conditions.

Together the BCCON and BCPROP keywords define the boundary conditions for the model, and can be used to set boundary conditions for when external influx or efflux volumes are influencing the reservoir pressure and production history. For example, when the average reservoir pressure remains constant throughout the production period due to water influx, or gas migration from an external source.

Note

This is an OPM Flow specific keyword and will therefore cause an error in the commercial simulator.

Notes:

The boundary condition connections must have been specified using the BCCON keyword.

Cells colored orange indicate parameters for the geo-mechanical boundary conditions that are only supported by the experimental geo-mechanical simulator.

Each record must be terminated by a “/” and the keyword is terminated by a “/".

See also the AQUFLUX keyword that is supported by OPM Flow in both the SOLUTION and SCHEDULE sections, to define a constant flux analytical aquifer.

If the BCCON and BCPROP keywords are not present in the input deck, then the boundary conditions for the model are set to be no flow, which is the normal behavior in both OPM Flow and the commercial simulator.

The BC keyword has been replaced by the BCCON and BCPROP keywords.

Records

One or more records, each terminated by /

Items per record

16

Parameters

Example

The first example shows how to set a constant pressure boundary using TYPE equal to FREE:
--
-- DEFINE BOUNDARY CONDITIONS CONNECTION (OPM FLOW GRID KEYWORD)
--
--INDEX ---------- BOX --------- BC
-- I1 I2 J1 J2 K1 K2 DIRC
BCCON
1 1 1 1 1* 1 1* X- /
2 1 1* 1 1 1 1* Y /
/
--
-- DEFINE BOUNDARY CONDITIONS PROPERTIES (OPM FLOW SCHEDULE KEYWORD)
--
--INDEX BC BC BC BC BC
-- TYPE COMPT RATE PRESS TEMP
BCPROP
1 FREE 1* 1* 1* 1* /
2 FREE /
/
With this option it is only necessary to define the boundary cells and all the other parameters (COMPONENT, RATE, PRESS, and TEMP) can be defaulted, as they are ignored when TYPE equals FREE.
The next example is based on NX, NY and NZ equal to 20, 1, 10 respectively, on the DIMENS keyword in the RUNSPEC section, and shows how different boundary types can be assigned to different parts of the model.
--
-- DEFINE BOUNDARY CONDITIONS CONNECTION (OPM FLOW GRID KEYWORD)
--
--INDEX ---------- BOX --------- BC
-- I1 I2 J1 J2 K1 K2 DIRC
BCCON
1 1 1 1 1 1 10 X- /
2 20 20 1 1 1 10 X /
/
--
-- DEFINE BOUNDARY CONDITIONS PROPERTIES (OPM FLOW SCHEDULE KEYWORD)
--
--INDEX BC BC BC BC BC
-- TYPE COMPT RATE PRESS TEMP
BCPROP
1 DIRICHLET GAS 1* 256.0 100.0 /
2 FREE 4* /
/
The last example shows how the DIRICHLET boundary condition option may be used:
--
-- DEFINE BOUNDARY CONDITIONS CONNECTION (OPM FLOW GRID KEYWORD)
--
--INDEX ---------- BOX --------- BC
-- I1 I2 J1 J2 K1 K2 DIRC
BCCON
1 1 1 1 1* 1 1* X- /
2 1 1* 1 1 1 1* Y /
/
--
-- DEFINE BOUNDARY CONDITIONS PROPERTIES (OPM FLOW SCHEDULE KEYWORD)
--
--INDEX BC BC BC BC BC
-- TYPE COMPT RATE PRESS TEMP
BCPROP
1 DIRICHLET WAT 1* 256.0 100.0 /
2 DIRICHLET WAT 1* 1* 100.0 /
/
Here, the first line sets both the pressure and temperature at the boundary, and the second line defaults the pressure entry, so that the simulator calculated initial boundary pressure will be used.
| Note This is an OPM Flow specific keyword and will therefore cause an error in the commercial simulator. |
|----------------------------------------------------------------------------------------------------------|

Manual source: parts/chapters/subsections/12.3/BCPROP.fodt