OLGAS is the steady-state flow correlation based on OLGA - the industry-standard dynamic multiphase flow simulator.
OLGAS is the superior mechanistic model that has been developed from laboratory test data supplied by operating companies since the mid-80s. OLGAS is continuously developed in conjunction with the OLGA dynamic simulator. The OLGAS program is a steady-state multiphase model for the calculation of pressure drop, local phase volume fractions and related information at a single point in a pipeline. In particular, OLGAS calculates pressure gradients, liquid hold-up and flow pattern at a specific section in a pipe or well.
The multiphase method challenge
Engineers are charged with the responsibility to find the appropriate multiphase method for to use in modeling well and pipeline systems. Cases where the use of OLGAS is essential include:
Lack of appropriate data when a new well or pipeline is being designed
“Industry standard” correlations do not fit the available test data
Different correlations are used within the same system to match field data
The same correlation yields very different results in another application
The OLGAS point model is available as a FLEXlm protected dll, which may be dynamically linked to a steady-state pipeline/well flow simulator. The OLGAS dll has three main interfaces:
- 2 phase interface
- 3 phase interface
- 3 phase interface with effective oil and water phase viscosity, including water/oil dispersion effects.
There are also defined interfaces for license control, extended input and output.
The OLGAS DLL is currently available on the Winnt, Win32 and Linux. Default programming languages available for interfacing are Fortran 77/90/95 and C/C++.
3rd Party Availability
OLGAS is available, with a product specific license, from a number of leading vendors of steady state simulators, who typically offer bi-annual upgrades. Each 3rd-party supplier is afforded identical implementations of OLGAS to assure that the flow correlation results provided by one simulator will be comparable to those from another. OLGAS updates are typically released twice a year.