Olga core system

Olga core system is the main module for the Olga simulator. It includes the steady-state and transient network solvers for three phase flow—water, oil and gas. The solvers calculate the slip (velocity difference) between the phases.


In most cases, production tubulars and pipelines have three phases flowing simultaneously. At low velocities there is considerable slip between gas and liquids, and also between oil and water. As a result, liquids tend to collect in low spots along the system, which leads to high local accumulations and increases the potential for slugging and surges. Where water accumulates, there is also potential for serious corrosion problems and hydrate formation.

Olga Core Systems
Liquid surge in a subsea pipeline

The Olga simulator supports process equipment modeling in deepwater field developments and other complex developments, and accurately models dynamic multiphase flow. Oil and water dispersions are also predicted; dispersion viscosities—which may deviate considerably from the oil-water average viscosities—are calculated by the default models or user-defined tuning factors.

  • Enables fundamental process equipment modeling
  • Supports connection to other simulators
A group sitting in an auditorium watching a presenter speak on a characterization model image

NExT Olga training courses

NExT offers a comprehensive training program to support users of the SLB software, plugins, and other software products.

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