Any theme that contains Petra well data can be exported to a "wsn list" file, thus allowing query results to be used in Petra functions that use wsn lists.
To export a well theme simply right click on the well theme and select the "Export Petra WSN List..." menu as shown below:
You can also save WSN lists from the expression, spatial and distance query screens. This allows a query to be performed, highlight the results, save a WSN list and cancel without actually saving a new theme.
