Published on: 11/25/2020
Time is money, and for the O&G industry it’s no different. Quicker turnarounds can make well interventions less costly and even improve operations, safety, and profitability. Multiple runs to define operation envelopes and risk-based approaches for flow assurance require computational efficiency to meet engineering timeframes. ALFAsim’s latest release comes with major improvements in performance and user experience so you’ll never want to use other tools again.
The just-released ALFAsim version 1.8.0 brings new features, such as advanced case initialization, new IPR models to represent the reservoir, and more options for boundary conditions. This release also allows you to create cross plots between simulated variables so you can better assess case behavior.
You can now initialize the simulation using interpolations along the pipes. The Constant option was replaced by a new option Table, which allows you to define different values throughout the edges for the main variables: pressure, velocity, volume fraction, temperature and tracer mass fraction. Those values can be entered by the user or interpolated between two points using three different methods: X-Axis, Y-Axis, and Length.
Models to represent the reservoir behavior are now defined as a new item in the project tree. Two types of models are available: the Linear model, which considers a linear curve for the Inflow Performance Relationship (IPR); and the Table model, which relates a pressure difference and flow rate to define the IPR.
Reservoir Inflow now uses an IPR model to define its productivity and injectivity indexes. Valve’s default type was changed from Perkins to Choke.
Pressure nodes now have new options to prescribe the phase split in case of backflows. Five split types are available:
Also available: a new selection box to explicitly define the number of phases available. With that, only the related options will appear, depending on the number of phases selected. The Emulsion model was moved to the Advanced tab, and it is only available when Three Phase Flow is enabled.
Maximum CFL value was moved to Numerical Options,
Maximum Timestep Change Factor was moved to Numerical Options,
Advanced tab was removed.
Addition of the ability to change the domain property in Trend and Profile plots. Dot clouds are displayed instead of curves when a non-default domain is used (default domain is Length for profiles and Time for trends).
It is now possible to export and import .alfacase files, a text-based project file.
These are the known limitations for this version:
Project backwards compatibility: Only ALFAsim projects from 1.5.0 and later releases are supported
Tracers will not be considered when using Gas Lift Valves
When using Restart as the Initial Conditions Strategy and checking the Keep Previous Results option:
If annulus flow simulation is enabled, the user needs to check Use Nonsplit Equipment on the Numerical Options advanced tab in order to use Valves and Pumps.
When using the Compositional PVT Model:
ALFAsim case file limitations:
For ALFAsim users:
1. Access the ESSS support center
2. Enter Username (your e-mail) and Password
3. If this is your first time accessing the portal, select Forgot my password
4. Download the installer for ALFAsim version 1.8.0
Should you experience any difficulties while downloading or using this version, please do not hesitate to contact us. As always, your feedback and suggestions are greatly encouraged and appreciated. Our technical support team may be reached at support.esss.co.