Successful production system design and operations requires a detailed understanding of multiphase flow behavior. Flow modeling and simulation provides valuable insights into flow behavior, including the physics describing flow through the entire production systems, from reservoir pore to process facility.
The OLGA dynamic multiphase flow simulator models time-dependent behaviors, or transient flow, to maximize production potential. Transient modeling is an essential component for feasibility studies and field development design. Dynamic simulation is essential in deepwater 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 analyses 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 all types of process equipment, the OLGA simulator provides an accurate prediction of key operational conditions involving transient flow.
The OLGA simulator enables key flow simulation applications, including
Customer-supported innovation and research has been at the core of the OLGA simulator’s development for more than 30 years. Validation of the OLGA code with large-scale lab research and the largest database of actual production data from leading E&P companies are key factors in its ongoing development.
Major oil and engineering companies participate in the OLGA Verification and Improvement Project (OVIP), which has collected the world’s largest database of lab and field data. This data has been used to validate and adapt the multiphase flow models. Results are continuously implemented in the OLGA simulator, improving the core technology to better match the realities of operations.
Additionally, the Horizon project is cosponsored by seven major oil companies, which addresses problems related to the cost-effective development and safe operation of long-distance gas-condensate transport and long-distance transport of oil well streams.
Improved functionality for pure CO2
Several improvements for existing CO2 capabilities have been implemented—including an improved table for single component CO2 option, improvements for the viscosity model, and priority fixes for tuning of mass transfer rate for a single-component model.
Improved handling of low-pressure situations
It is now possible to use a special low-pressure handling feature. When activated, if below a defined pressure threshold, the OLGA simulator calculates the fluid properties and flashing with special consideration to avoid numerical problems.
New mass-based option of injection rate calculations
OLGA 2020.2 introduces a new key in the inflow performance relationship (IPR) keywords. The key can be used to select how to convert the volume flow rate of reservoir fluid at standard conditions to in situ injection rate and improves usability for such scenarios.
Better prediction of pressure drop
The HD flow model has been updated to improve its accuracy for gas condensate production systems. Extensive improved pressure-drop predictions at high gas rates for low liquid loading.
More accurate water accumulation
The momentum mixing across the oil/water interface has been reduced to increase oil-water slip and increase water accumulation for gravity dominated flow at high gas flow rates.
New slug initiation model
The slug initiation model is extended to include initiation of slug bubbles in bubbly flow improving prediction of slug dynamics in liquid dominated systems.
Improved pig modeling capabilities
Improved pig model capabilities to simulate complex pigging scenarios involving long traveling distances, complicated pipeline geometry as well as multiple pig trains with large pressure and/or liquid discontinuities across the pigs.
HA model used for aqueous phase
The CSMA High Accuracy (HA) model for aqueous phase properties is used in OLGA Compositional Tracking improving accuracy when modelling aqueous component mixtures.
OLGA and Symmetry integration
The integration between OLGA and Symmetry enables integration between upstream and process operations. High performance communication yields efficient data transfer and rapid insight.
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