The OLGA dynamic multiphase flow simulator models transient flow (time-dependent behaviors) to maximize production potential. Transient modeling is an essential component for feasibility studies and field development design. Dynamic simulation is essential in deep water and is used extensively in both offshore and onshore developments to investigate transient behavior in pipelines and wellbores.
Transient simulation with the OLGA simulator provides an added dimension to steady-state analysis by predicting system dynamics, such as time-varying changes in flow rates, fluid compositions, temperature, solids deposition, and operational changes.
From wellbore dynamics for any well completion to pipeline systems with various types of process equipment, the OLGA simulator provides an accurate prediction of key operational conditions involving transient flow.
OLGA 2019.1 provides a generalization of the existing hydrate check functionality. The new curve check functionality calculates the distance between a generic curve and the current operating conditions in a pipe section and can perform checks against multiple curves. Further, the curve data can be written to a file and plotted in trend and profile plots together with the OLGA simulator output variables.
For OLGA Compositional Tracking, the OLGA simulator can now calculate the hydrate formation risk during the simulations based on in-situ conditions in the pipeline taking both pressure, temperature, and fluid composition into account. This yields a more accurate hydrate formation check than using predefined hydrate curves.
OLGA 2019.1 allows for use of multiple restart files, where each restart file represents one part of a larger model. It is also possible to use restart files generated with older versions of the OLGA simulator. These new features support life-of-field scenarios and provide more flexible means to initialize a model. Restart files generated with versions prior to OLGA 2018 cannot be used.
OLGA 2019.1 offers more flexible tuning of the OLGA simulator model both with hierarchical tuning capabilities and new tuning parameters for slug flow, flow regime transition and slip of water/oil droplets in oil/water layers. It is now easier to tune models to match available field data.
OLGA 2019.1 extends the capabilities of algebraic controllers to accept mathematical equations and logical expressions as a proper infix expression. With this new option, an expression can be defined by one single algebraic controller removing the need for numbers and network of algebraic and manual controllers to define the same expression.
OLGA 2019.1 includes improvements in the modeling of transient phenomena in centrifugal pumps, such as pressure surges during start-up, shut down, or tripping. The pump speed can be determined from the torque balance equation of the pump and driver system for the following pump types: Centrifugal pump, ESP, simplified pump, pump battery, and PCP. The moment of inertia can be accounted for, either by a user-defined value or by an estimate based on vendor data.
As highlighted in the OLGA 2016.1 release, the OLGA Complex Fluid module is now retired. It has been replaced by rheology functionality.
The product is suitable for use by production, process, and flow assurance engineers, and those involved in multiphase flow simulation.