BlackOilSeparator is the process-equipment bridge for NeqSim’s pressure-indexed black-oil PVT model. It performs one equilibrium black-oil flash at a specified outlet pressure and temperature and can participate in normal ProcessSystem execution.

Model contract

Item API or unit
Java class neqsim.process.equipment.blackoil.BlackOilSeparator
Inlet model neqsim.blackoil.SystemBlackOil
Outlet pressure bar absolute
Outlet temperature K
Products getOilOut(), getGasOut(), and getWaterOut() as SystemBlackOil objects
Flash evidence getLastFlashResult() and getResultsMap()
Process reporting toJson()

The constructor requires the equipment name, inlet SystemBlackOil, outlet pressure, and outlet temperature. The model does not use StreamInterface: its inlet and three products remain black-oil systems containing standard oil, gas, and water totals. Use the compositional separator equipment when a flowsheet needs component-level material streams.

Execution and conservation

On each run the unit sets the specified pressure and temperature, flashes the inlet black-oil system, and partitions standard totals into oil, free-gas, and water products. A robust workflow checks:

  1. standard oil, gas, and water closure across the three products;
  2. the Rs, Rv, Bo, Bg, and Bw values in BlackOilFlashResult;
  3. pressure and temperature units before comparing with laboratory or simulator tables;
  4. the PVT-table pressure and temperature validity range.

The temperature is a state label for the selected black-oil table; the underlying table does not create an independent continuous temperature correlation. Use separate qualified tables when temperature dependence is material.