Migrating VMGField Cases to Symmetry's Pipe Workspace
VMG has been working hard to develop functionality to allow models created in VMGField to be migrated to Symmetry’s Pipe Workspace. Such capability will allow the user to leverage the VMGField GIS and other features used in building large scale pipe networks rapidly and then perform high fidelity evaluations using the Symmetry simulators.
An example where this would be of value is in the case of the onset of liquid loading in a pipeline as the field depletes. VMGField could be used to forecast when liquid loading in a gas field becomes significant enough to warrant the development of a pigging program. The network configuration and conditions at various points in time could then be migrated to Symmetry’s Pipe Workspace and a dynamic simulation be run to design the pigging program. Such an evaluation leverages the strength of both tools and maintains consistency throughout the simulation while minimizing overall data entry time and effort.
This guide details how to set up the VMGField case in preparation for migration to the Pipe workspace. It assumes:
- The pipe network will be imported from a shape file.
- The shapefile in this case will have been generated from IHS Accumap.
- There is no elevation data accompanying the shape file.
- VMGField will be used to set up the network for import to Symmetry’s Pipe Workspace without running any forecasts. Simply to be the front-end for Symmetry’s Pipe Workspace.
- The user already has a pipe network shapefile and DEM file available.
- Import the shapefile into VMGField.
- Add wells/sources and at least one delivery point/sink.
- Use Network Connection Tool to connect wells and unconnected pipe segments or manually connect them.
- Import DEM data.
- Assign DEM elevations to nodes in pipeline system.
- Export VMGField model to Symmetry's Pipe workspace.
Step 1: Import the shapefile into VMGField
1. In VMGField, go to File- Import Data- Pipe License, browse to the desired shapefile and Open.
2. Select the pipe segments you wish to import, set a pipe group (if desired), and the units, then click Import.
3. You may choose to map items like Line ID, Pipe Diameters, etc from the shapefile to VMGField. This will save the user from having to do it manually later.
4. The shapefile will be imported.
Step 2: Add wells/sources and at least one delivery point/sink
5. Click on the Select Mode , then at a desired location on the map screen, right click and select “Add well”.
6. A well will be added. Repeat throughout the model. A well/source is required on the upstream end of any line that feeds the network. Wells can also be added en-masse from a well list through the Data- Well List dialog.
7. Add delivery points/sinks by double clicking the downstream node of any pipe segment that terminates the model at that point, then choose “Yes” when it asks if you want to add a Demand.
8. Add some basic specifications to the delivery point such as pressure. Repeat for other delivery points in the model.
Step 3: Use Network Connection Tool to connect wells and unconnected pipe segments or manually connect them
9. You may manually draw long pipe using “Add Network Pipe” . Repeat where desired.
10. Be sure to assign a diameter to the new pipe you have just drawn. There are numerous ways to expedite the assigning of the pipe diameter that are covered in the VMGField course.
11. Run the Network Connection Tool to automate connecting the wells and remaining unconnected pipe segments by selecting Design- Network Connection Tool.
12. In the Connection Settings window, set the search radius to a desired number, then in the Unconnected Nodes window, select the desired unconnected wells, and click Connect Wells.
13. If any wells are left, you may manually connect them, or move the well within the specified radius and press Connect Wells again. Remember, any pipe segment you manually add will need to have a diameter assigned.
14. When all the wells are connected, select the unconnected pipe ends in the Unconnected Nodes window and click Connect Pipe. For the remaining pipe in the list, manual intervention is usually required due to the condition of the shapefile. Other operations such as flipping the pipe direction may also be required to clean up the shapefile.
Step 4: Import DEM data
15. Click File- Import Data- DEM and browse to the desired DEM file.
16. The DEM data will be imported and contoured. The contours can be turned on and off in the Misc tab of the Display Pane by toggling the respective item under Shapes.
Step 5: Assign DEM elevations to nodes in pipeline system
17. Choose Design- Select- All Node.
18. Choose Design- Set Node Elevation (DEM), the elevations from the DEM data will be assigned to the nodes.
19. The manually drawn pipe segments will need a length assigned which can be done by selecting Design- Select- Pipes with Unset Length.
20. Right click and choose Calculate Pipe Length(s) to have VMGField assign the length.
Step 6: Export VMGField Model to Symmetry's Pipe Workspace
21. The model doesn’t have to be in a condition to run so can now be exported to Symmetry’s Pipe Workspace. Go to File- Export Data- Pipe Workspace input file…
22. The user has the option of selecting some or all of the timesteps in the VMGField simulation to export to the Pipe Workspace. This can be done in the Generate Files window. Check the Ignore PVT Data box and press OK. A *.vpif file will be created.
23. Go to Symmetry, click New.
24. Click on Done in the Configure Property Package window that pops up.
25. Click File- Import.
26. Browse to C:\VMGField\<project name> for the project you created in VMGField and Open the *.vpif.
27. The import should commence. When done, the network should appear in the Pipe Workspace flowsheet the same as in VMGField. Modifications or analysis with the Pipe Workspace can now commence.
VMGField - Symmetry's Pipe Workspace
Please contact your local VMG office for more information.
Gordon Slemko, P. Eng., VMG Calgary