Black Oil Model Characteristic curves

The black oil model requires the definition of two capillary pressure curves, for the interface between the oil and water phases, and the interface of the oil and gas phases. In addition relative permeabilities for the water, gas and the oil must also be specified.

Black Oil - saturation properties by tables - example

In the example below the tables needed to define \(P_{cow}\), \(K_{rw}\), \(K_{rg}\), \(P_{cog}\), \(K_{row}\) and \(K_{rog}\) have been specified. The oil relative permeability defaults to ECLIPSE model. Keywords such as KRW_TABLE are not needed as each saturation property is defined unequivocally.

CHARACTERISTIC_CURVES bo_sat_prop_table_example
  TABLE swfn_table
    PRESSURE_UNITS Bar
    EXTERNAL_FILE swfn_file.dat
  END
  TABLE sof3_table
    EXTERNAL_FILE sof3_file.dat
  END
  TABLE sgfn_table
    PRESSURE_UNITS Pa
    EXTERNAL_FILE sgfn_file.dat
  END
END

Where the file “swfn_file.dat” contains the water saturation table:

SWFN
  0.22 0   0.48
  0.3  0.07 0.27
  0.4  0.15 0.2
  0.5  0.24 0.17
  0.6  0.33 0.14
  0.8  0.65 0.07
  0.9  0.83 0.03
  1    1    0
/

The file “sgfn_file.dat” contains the gas saturation table:

SGFN
  0.00 0.00 0.00
  0.04 0.00 0.014
  0.10 0.02 0.034
  0.20 0.10 0.068
  0.30 0.24 0.10
  0.40 0.34 0.14
  0.50 0.42 0.17
  0.60 0.50 0.20
  0.70 0.81 0.24
  0.78 1.00 0.27
/

The file sof3_file.dat contains the oil permeability table:

SOF3
  0    0       0
  0.2  0       0
  0.38 0.00432 0
  0.4  0.0048  0.004
  0.48 0.05288 0.02
  0.5  0.0649  0.036
  0.58 0.11298 0.1
  0.6  0.125   0.146
  0.68 0.345   0.33
  0.7  0.4     0.42
  0.74 0.7     0.6
  0.78 1       1
/