BDENSITY

Recognised by the OPM Flow parserPROPS

BDENSITY defines the brine surface density for when the brine phase has been activated in the model by the BRINE keyword in the RUNSPEC section. The number of BDENSITY vector data sets is defined by the NTPVT parameter on the TABDIMS keyword in the RUNSPEC section. Each record consists of a maximum of NPPVT values, as declared on the TABDIMS keyword in the RUNSPEC section, with each value representing a brine surface density.

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

The keyword is used in conjunction with the PVTWSALT keyword in the PROPS section, with each brine density value matching with the salt concentration values in column 1 of each table in the PVTWSALT keyword. Note that the BDENSITY keyword is optional, and if absent from the input file, then the brine surface densities will be set to the water density values declared via the DENSITY keyword in the PROPS section. In this case there is no variation in brine surface density with respect to salt concentration.

Notes:

Each row vector data set must be terminated by a “/” including the last data set.

Note

In OPM Flow the tracer equations are solved decoupled from the reservoir equations at the end of a time step. For each tracer an implicit system is solved, however, the tracer equations are linear, resulting in converge in two iterations. However, the Brine phase is solved fully implicitly and is fully coupled with the other flow equations.

This is different to the commercial simulator, where the tracer equations are solved explicitly after the flow equations have converged at the end of a time step. This can lead to numerical instabilities if there are large variations in brine densities.

Records

Fixed number of records

Variadic

The record accepts a variable number of items

Parameters

Example

The following shows the BDENSITY and PVTWSALT keywords for when NTPVT on the TABDIMS keyword in the RUNSPEC section is set equal to two and NPPVT is set to greater than four on the TABDIMS keyword.
--
-- BRINE WATER DENSITY DATA FOR PVTWSALT KEYWORD
--
-- SALTCON SALTCON SALTCON SALTCON SALTCON -- DENSITY DENSITY DENSITY DENSITY DENSITY
-- ------- ------- ------- ------- -------
BDENSITY
62.20 63.50 64.75 65.90 / FOR PVTWSALT TABLE 1
64.00 65.50 67.00 / FOR PVTWSALT TABLE 2 --
-- WATER SALT PVT TABLE
--
PVTWSALT
-- REF PRES REF SALT
-- PSIA LB/STB
-- -------- --------
4500.0 0.000 / TABLE NO. REF. DATA
--
-- SALTCONC BW CW VISC VISC
-- LB/STB RB/STB 1/PSIA CPOISE GRAD
-- -------- -------- ------- ------ ------
0.0 1.020 2.7E-6 0.370 0.0
2.0 1.010 2.7E-6 0.370 0.0
4.0 1.000 2.7E-6 0.370 0.0
10.0 0.950 2.7E-6 0.370 0.0 / TABLE NO. 01 SALT DATA
--
-- REF PRES REF SALT
-- PSIA LB/STB
-- -------- --------
4000.0 0.000 / TABLE NO. 02 REF. DATA
--
-- SALTCONC BW CW VISC VISC
-- LB/STB RB/STB 1/PSIA CPOISE GRAD
-- -------- -------- ------- ------ ------
0.0 1.005 2.5E-6 0.320 0.0
6.0 0.985 2.5E-6 0.320 0.0
12.0 0.930 2.5E-6 0.320 0.0 / TABLE NO. 02 SALT DATA
| Note In OPM Flow the tracer equations are solved decoupled from the reservoir equations at the end of a time step. For each tracer an implicit system is solved, however, the tracer equations are linear, resulting in converge in two iterations. However, the Brine phase is solved fully implicitly and is fully coupled with the other flow equations. This is different to the commercial simulator, where the tracer equations are solved explicitly after the flow equations have converged at the end of a time step. This can lead to numerical instabilities if there are large variations in brine densities. |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

Manual source: parts/chapters/subsections/8.3/BDENSITY.fodt