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VMGThermo Integration with GASMOD

VMG Gasmod v6.0 Official Release

We are pleased to announce that July marked the official release of Gasmod v6.0.  There have been many upgrades and enhancements since v5.4, several of which will be the subject of these articles going forward. Showcased below are the features now available as a result of the initial integration with VMGThermo.

VMGThermo Integration

VMGThermo has been integrated with Gasmod to allow the user the ability to perform Energy Balance and Temperature calculations across their pipeline network model. This includes modeling flowing temperature, hydrate formation temperature, and line heaters. 

The Power

There are several reasons why these features provide so much power to the user.  A few of these include:

  • Having the hydrate formation temperature calculated within Gasmod means the user doesn’t have to characterize their fluid and export a hydrate formation curve from another package, thus expediting evaluations requiring knowledge of hydrate formation.
  • Accurate phase determination can be calculated for saturated fluids with very temperature sensitive PVT characteristics such as volatile oils and retrograde gas condensate.  Subsequently, this improves the accuracy of holdup and pressure drop calculations within the wellbore and pipeline models.
  • Line heater duty and requirements can be estimated, scheduled, and budgeted.
High Level Procedure

To invoke the Energy Balance and Temperature calculations, while in the History case the user must first go to Data - Empirical Data – PVT Properties.  

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In the Single Component Gas and Fully Compositional tabs, a VMGThermo button now exists.

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As an example, the user may click this button in the Single Component Gas tab, place a check in the “Use VMG Thermo for energy balance calculation” and specify the fractions of the C2+ components that are actually C2, and C3+ components that are actually C3.  The remainder is assumed to be C4.   

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Once this data has been entered, the calculations can be invoked through Simulation – Energy Balance Settings. It is recommended to create a forecast case with the Energy Balance calculations invoked.  This will preserve the history match and calibration if using an existing model.

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Under Calculation: the user may change the drop down to “Calculate Energy Balance + Hydrate”, for all pipes for example.  

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The Overall Heat Transfer Coefficient will need to be provided for the wellbores and pipelines.

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When the simulation is run, the user can now observe the calculated flowing temperature and hydrate formation temperature on the Pipe Cross Section view.

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Line Heaters

Building on the previous section, a line heater can be created by double clicking on a node and selecting New Line Heater from the menu that appears.

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That node will be converted to a line heater and the user can specify the control on the line heater, either by Temperature or Heat Addition Rate.

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When the simulation is run, the user can observe the effect of the line heater in the Pipe Cross Section view.

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A detailed step-by-step example can be provided, if desired.

Summary

The VMGThermo integration with Gasmod marks the start of the benefits and functionality that can be achieved with cross pollinating Gasmod and other VMG software.  Work is continuing to broaden such capabilities where it makes sense and leverage all the powerful features of VMG’s software.

Please contact your local VMG office for more information.

Gordon Slemko, P.Eng., VMG Calgary

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