7.7 - Targets
Available from field level down to actual well/planned level. The Targets dialog allows the user to create and manage targets and lease lines, which can then be navigated to as part of a plan, plotted on charts and used in anti-collision.
7.7.1 - Targets Toolbar
The targets toolbar is displayed at the top of the dialog, with the following functions:
Save Target: Saves any changes made to the currently selected target.
New Target: Creates a new target.
Delete Target: Deletes the currently select target.
Copy Target: Creates a duplicate of the currently selected target
Export Target: Exports all of the targets currently displayed in the targets grid to a .mdb format export file.
Import Target: Imports the targets contained in a target export file. Note that targets in Well Seeker X must have a unique name. If the software detects that the name of an imported target matches the name of an existing target, the imported target will have a timestamp appended to it’s name. Imported targets are assigned at the level selected when the Targets dialog was opened.
Bulk Import Targets: Opens the Bulk Targets Import dialog. This allows the user to quickly create multiple point targets by entering their co-ordinates into the table. Before entering the data the user should select how the lateral co-ordinates of the new targets are referenced – either local displacement from the wellhead, grid northings/eastings or latitude/longitude. They should also choose the vertical depth reference – TVD or TVD subsea. The user can then type or paste their data into the table and click on Import to create the targets.
7.7.2 - Targets Grid
The targets grid contains a list of the targets that are available for selection. Targets will only be visible in the grid if they are currently associated with the level the dialog was opened from. If you wish to see targets from other wells/plans under the same field, use the drop-down box above the grid to move up to a higher level. When the target dialog is first opened, the filter is set to the current level by default.
The check boxes beside each target can be clicked to associate the target with the desired level. To plot a target on a chart or use it in planning, it must be associated with actual or plan level. Targets are always available to the field level.
The deepest level the target can be assigned to is dependent on which level the dialog was opened. For example, if the dialog was opened at well level, it would not be possible to associate the target with any actual wells or plans but it would be possible to associate the target with other wells and facilities.
Regular targets and lease lines are contained in separate lists. To switch from viewing targets to viewing lease lines, click on the Show Lease Lines checkbox. Note that only polygon shaped targets can be turned into lease lines.
Clicking on a target’s name in the grid will select it so that it’s properties and shape can be edited.
7.7.3 - Target Properties & Vertical Depth
Use the Name box to edit the name of the target. The name shown in the grid will not update until the user saves their changes.
Enter the TVD of the centre point of the target in the TVD box. The centre point is the point that the planning tools will navigate to, regardless of the shape of the target. **Note that the reference point for the TVD depends on the level that the dialog was opened at, and does not change if the level is changed using the dropdown box above the grid.**For Field, Facility, and Well level the TVD datum will be the system datum, and for actual and planned wells, the datum will be the depth reference selected in the Actual/Planned Well Properties.
The reference point currently in use is displayed the TVD edit box.
7.7.4 - Colour and Line Style
Toggle the Force checkbox to lock the target to the selected colour and line style. This means that when a target is displayed on a plot, it will always display with that colour and line style. This will also prevent the colour and style from being changed using the Chart Properties dialog.
7.7.5 - Drillers Target
To create a drillers target enter the confidence level required in the confidence box. This represents the statistical likelyhood that if the drillers target is hit the well will be within the geological target. Click the create drillers target button and select the well path which will be used to create the target. If the well path does not reach the targets TVD an error will be displayed. If the errors are small enough and the confidence level selected allows, the drillers target will be created and displayed on the plot. If the survey errors are too large or the confidence level too high an error will be displayed. Selected confidence must be less than 100%.
7.7.6 - Target Center
The target centre location can be defined in three ways by selecting the appropriate radio button:
Local: Local coordinates relative to the local datum. **Note that the reference point for the local datum depends on the level that the dialog was opened at, and does not change if the level is changed using the dropdown box above the grid.**The current datum is shown in the text at the bottom of the target centre frame.
Map: Enter the grid northing and easting location of the target. This is usually the best way to enter the target centre location as it leaves no room for confusion which can occur with local coordinates.
Geographic: Enter the target latitude / longitude.
7.7.7 - Target from horizontal displacement
When a target is supplied as a horizontal displacement and azimuth from the surface location, the user can use this section to generate the desired local coordinates. Once these details are added and calculate has been selected, the program will automatically populate the target’s local coordinates. This option will only be available when local is selected in the target centre section.
7.7.8 - Target Shapes
After configuring the target co-ordinates on the left hand side of the Targets dialog, the user can move over to the right hand side to define it’s shape. Choose a shape for the selected target by clicking on one of the tabs. This will then display additional options that can be used to further configure the shape.
7.7.8.1 - Point Targets
No data is required for entering a point target.
7.7.8.2 - Circular Targets
Dip Angle: The dip angle of the target horizontal plane. Note that this is applied after the rotation setting.
Dip Azimuth: The azimuth of the dip direction
Thickness Up: The distance from the target centre to the top of the target
Thickness Down: Distance from the target centre to the bottom of the target
Radius: The target radius
Aiming Point Offset From Target Centre: Offsets the centre of the circle north/south and east/west from the target co-ordinates. Note that the target itself does not change, just the position of the circle.
Arc Properties: Allows half-moon targets or equivalent to be created. Specify the start angle of the arc and the end angle.
7.7.8.3 - Elliptical Targets
Dip Angle: The dip angle of the target horizontal plane. Note that this is applied after the rotation setting.
Dip Azimuth: The azimuth of the dip direction
Thickness Up: The distance from the target centre to the top of the target
Thickness Down: Distance from the target centre to the bottom of the target
Semi-Major: The length of the ellipse semi major axis
Semi-Minor: The length of the ellipse semi minor axis
Aiming Point Offset From Target Centre: Offsets the centre of the ellipse north/south and east/west from the target co-ordinates. Note that the target itself does not change, just the position of the ellipse.
Arc Properties: Allows half-moon targets or equivalent to be created. Specify the start angle of the arc and the end angle.
Rotation: The rotation angle from north of the target centre line. Note that this is applied before the dip angle is applied.
7.7.8.4 - Rectangular Targets
Dip Angle: The dip angle of the target horizontal plane. Note that this is applied after the rotation setting.
Dip Azimuth: The azimuth of the dip direction
Thickness Up: The distance from the target centre to the top of the target
Thickness Down: Distance from the target centre to the bottom of the target
Length: The length of the target
Width: The width of the target
Aiming Point Offset From Target Centre: Offsets the centre of the rectangle north/south and east/west from the target co-ordinates. Note that the target itself does not change, just the position of the rectangle.
Rotation: The rotation angle from north of the target centre line. Note that this is applied before the dip angle is applied.
7.7.9 - Polygon Targets & Lease Lines
Polygon targets can be used for defining unusual shaped drilling targets as well as lease lines and hard lines. They are constructed by entering the locations of the corners of the shape into the table.
Target Co-ordinates: The user can choose to enter the co-ordinates of each corner using local XY values or map values. If local values are selected, enter the local NS and local EW values with respect to the target centre defined on the left hand side of the dialog. If Map is selected, enter the co-ordinates as grid northings and grid eastings. Entering one value type will cause the other to be automatically calculated.
Rotation: The user can toggle this option on and enter a value in degrees to rotate the target, with the target centre as the centre of rotation.
Target Thickness: If the user selects Constant here, they can enter a target thickness above (Up) and below (Down) to the target. If Individual is selected, they can use the table to define the target thickness at each point.
Formation Properties: Toggle the checkbox to allow a dip angle and azimuth to be added to the target.
Offset Poly: This option allows the user to reduce the size of a polygon target by a set distance. This is useful for creating a hard line from a lease line at know set back distance. Enter a positive value into the Distance to Offset box to enlarge the polygon, or a negative value to shrink it. Then click on the Offset Poly to create a new lease line with the offset applied. Complex polygons may have their corners / edges rounded or smoothed to account for shrinking.
Lease Line/Hard Line: A polygon target can be turned into a lease line or hard line by checking the Is a Lease Line or Is a Hard Line checkbox. This enables them to be used with lease line specific features such as the Real Time AC and lease line intersection annotations on plots.
It is important to understand that once this has been checked, Well Seeker will see this as a lease/hard line and not a target. The next time the user opens the target box, the lease line will no longer be visible. To see these lines, the user can select the “Show Lease Lines” option above the Targets Grid. This filter will hide the targets and display only the lease lines and the hard lines.
Lease lines will still be available to plot and can be manipulated in a similar way to regular targets in the chart properties.
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