The OLGA* dynamic multiphase flow simulator models time-dependent behaviors. Dynamic simulation is extensively used in both offshore and onshore field developments. From wellbore dynamics - for any well completion - to pipeline operations - for process systems containing any type of equipment - the OLGA simulator provides an accurate prediction of key operational conditions involving transient flow. Together with the PIPESIM* steady-state multiphase flow simulator, Schlumberger provides a complete software solution for design and optimization of production systems. OLGA 2021.1 Released.

Enhancements in OLGA 2021.1 

-          FieldTwin integration for profile import.

-          Updated NORSOK corrosion model.

-          Enhanced functionality for single component fluids.

-          Increased flexibility in modeling of pressure protection systems.

-          More complete OLGA messaging interface readily available.

-          Updated licensing.

-          New version of Multiflash.

FieldTwin integration for profile import

From OLGA 2021.1 you can import pipeline and well geometry data into the OLGA Profile generator from the web application FieldTwin™ Design by FutureOn. FieldTwin Design is a powerful tool that enables you to build and visualize a digital copy of your physical assets.

Using the new option Import from cloud on the Import page in the OLGA Profile generator, you can import X/Y coordinates, pipeline diameter, and pipe roughness into the tool. Once imported, you can use the existing workflow to make the data suitable for use in an OLGA simulation while maintaining the key characteristics of the original profile.

When you save the profile as a .gml file, you can import it into the Flowpath geometry data view as before, and OLGA will automatically populate the data for inner diameter and wall roughness.

To use the functionality, you need a valid DELFI* user account as well as a separate agreement with FutureOn to access data in FieldTwin.

Updated NORSOK corrosion model

OLGA 2021.1 includes an updated version of the NORSOK corrosion model that complies with the 2017 NORSOK-506 standard. The NORSOK model calculates pH and corrosion rate in bulk water, and the updated model accounts for the effect on pH of acetic acid. An increase in concentration of acetic acid will in general tend to increase the corrosion rate due to a lower pH.

Enhanced functionality for single component fluids

Use of predefined fluid tables

OLGA 2021.1 introduces a new key, USETABLE, in the SINGLEOPTIONS keyword. You can use the key to apply a pregenerated pressure-temperature, or pressure-enthalpy, fluid table in when simulating a single component fluid system. To use a pre-generated table, you must define the relevant file in the key PVTFILE under the FILES keyword.

The new functionality enables you to use fluid tables generated by any PVT software using any equations of state and transport properties models. The only requirement is that the fluid table contains the properties OLGA needs in a format that OLGA understands.

More accurate speed of sound

OLGA 2021.1 presents a modified calculation method for speed of sound that improves the accuracy in the simulation results when close to the critical point.

In addition to the more accurate results, the modifications contribute to the use of relatively larger time steps than before.

Improved flexibility in modeling of pressure protection systems

OLGA 2021.1 introduces improved flexibility and usability to assist in the design of high-pressure protection systems and the associated modelling of the scenarios. For fast pressurization scenarios, the condensation should be switched off.

Two new keys in the TUNING keyword, CONDENSATION and VAPORIZATION, allow separate scaling of mass transfer due to condensation or vaporization. The key MASSTRANSFER gives the default values for the two keys.

If the gas phase mass transfer rate is negative, OLGA will multiply the mass transfer rates for all phases by the condensation scaling factor, otherwise, OLGA will multiply the mass transfer rates of all phases by the vaporization scaling factor.

More complete OLGA messaging interface readily available

OLGA comes with a fully documented C API for the communication protocol ZeroMQ, called OlgaMsgSDK. The SDK is a replacement for the aging OLGA OPC server functionality and does not require administrator privileges to run. Using ZeroMQ instead of OPC will prevent known issues with the OPC and DCOM.

From OLGA 2021.1, you can download the file package from the Schlumberger Software Download Center . After unzipping the OLGAMsgSDK.zip file, you can find the documentation in the README.html file.

In addition to the core C API, the file package contains three wrappers for the API:

-          C++ API wrapper.

-          C# API wrapper.

-          Python API wrapper.

New command line switch

A new command line switch, -noStopAtEnd, is available. When using this option, OLGA ignores the setting for ENDTIME and therefore continues the run even after ENDTIME is reached

New version of Multiflash

Multiflash™ 7.2 by KBC is available in OLGA 2021.1. New features in this release include the option to generate pressure-enthalpy fluid tables for use with OLGA.

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