The PVCO block is used to define the properties of a live oil for a range of different temperature and pressures. Below an example where data is given for only one temperature, and field units (i.e. different from default) are specified for pressure, \(R_s\), formation volume factor, compressibility and viscosibility:

    PRESSURE psi
    RS Mcf/bbl
    FVF bbl/bbl
      14.7   0.001  1.062 1.04  1.36D-5 9.01D-5
      264.7  0.0905 1.15  0.975 1.36D-5 9.01D-5
      514.7  0.18   1.207 0.91  1.36D-5 9.01D-5
      1014.7 0.371  1.295 0.83  1.36D-5 9.01D-5
      2014.7 0.636  1.435 0.695 1.36D-5 9.01D-5
      2514.7 0.775  1.5   0.641 1.36D-5 9.01D-5
      3014.7 0.93   1.565 0.594 1.36D-5 9.01D-5
      4014.7 1.270  1.695 0.51  1.36D-5 9.01D-5
      5014.7 1.618  1.827 0.449 1.36D-5 9.01D-5
    END !end TEMP block
  END !endDATA

The PVCO block may contain several pressure tables, one for each temperature. In the pressure table, column 1 is the pressure, column 2 is the solution gas-oil ratio (Rs), column 3 is the formation volume factor (\(B_o\)), column 4 is the viscosity (\(\mu_o\)), column 5 is the compressibility, \(C_o =-(dB_o/dP)/B_o\) , column 6 the viscosibility, \(C_v =(d\mu_o/dP)/\mu_o\).

The pressure in column 1 must increase monotonically, and the pressure tables must be ordered for increasing temperatures. The number of pressure points given for each temperature must be the same, however the values and range of the pressure can vary. Temperatures and pressures outside the given range are extrapolated. When pressure data are available for only one temperature, the properties are considered isothermal.

The default units used by this table are:

  • Bar for the pressure,

  • \(m^3/m^3\) for \(R_s\) and \(B_o\)

  • cP (centipoise) for the viscosity

  • 1/Bar for the compressibility and viscosibility

  • C for temperature.

DATA_UNITS specifies units different than the default values, and include only the properties (in any order) for which units are needed. The temperatures can currently be entered only in degrees Celsius.