6.5 - Level 5: Well
Well level in the object explorer defines the properties of the surface location of a single wellhead.
The Well Properties dialog will automatically open when a new well is created. To access the Well Properties for an existing well, right click on it in the Object Explorer. The Well Properties dialog has the below features:
6.5.1 - Properties
Name: The name displayed in the Object Explorer.
Description: A description of the well, used only for information.
Location Uncertainty: The vertical and horizontal location uncertainty of the well head entered at 1 sigma. This location uncertainty will be added to the starting error ellipse when running an anti-collision scan.
Show Map: This extends the existing dialog to include a Google Maps section. This will show the location of the positional data entered and can be toggled between map and satellite view using the Satellite checkbox. The map can also be zoomed in and out using the – and + buttons. This map location will only be accurate if the CRS selected uses WGS 84, as this is what Google Maps utilises.
Locked: This checkbox allows the user to lock all the editable cells in the dialog. If NO password has been entered at Operator level in the set password section, then the user can freely select to lock and unlock the dialog. If a password has been added at Operator level, then the user must enter the relevant password to both lock and unlock the dialog.
6.5.2 - Wellhead Location
Describes the surface location of the well. The user as four options:
Slot: If a template has been created at facility level, the well head location can be assigned to a slot from the template. Select the slot from the drop-down list. If the slot is moved the well will move along with it.
Offset from facility: The well head location is defined by an offset from the facility reference point. This is specified in local north/south and east/west coordinates.
Map: The map coordinates of the well head expressed in northings and eastings.
Geographic: The latitude and longitude of the well head.
Note that when a value is entered for one option, the values for the other options will be calculated.
Grid Convergence: The grid convergence at the well head location.
Scale Factor: The scale factor of the CRS selected at field level.
6.5.3 - Depth Reference
The depth reference grid allows the user to enter the elevation and details of multiple depth references which have been used. A depth reference usually represents the rotary table elevation of a drilling rig, and if multiple rigs have been used to drill the well, they can be entered here. Entering the details for one depth reference will create a new row underneath it, so that a new one can be entered.
Datum Name: The name which will be displayed on reports and when selecting the depth datum at actual well or plan level.
Elevation above system: The elevation above the system vertical datum of the depth reference – unless this has been changed in the Field Properties, this will be Mean Sea Level.
Rig: Optionally enter a rig name as a reference. This is not used anywhere else.
Default: Marking a depth reference as the defaults means that it will be automatically assigned to any new actual wells or plans created under this well.
Once the elevation is entered the specifics of the datum can be entered in the section to the right of the grid.
If the datum is for an offshore rig, the first edit box will be the water depth. If the well is onshore, the edit box will represent the elevation of ground level above MSL.
If “offshore” is selected, the user can enter the well head elevation above MSL. If “subsea” is selected, the elevation below MSL can be entered. This is the distance between the top of the well head and MSL.
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