Well Pad Preliminary

When you create a well pad, all its wells are generated based on the settings on the Well Pad Preliminary form. By default, the settings from the Drilling Constraints form are propagated to the Well Pad Preliminary form. You can change these default settings on the plan > Well Pads > Drilling Constraints form - see Drilling Constraints.

On the Well Pad Preliminary form, you can view and modify the settings for the selected well pad. These settings will apply to all the wells of the well pad.

Under 'Location', you can specify the following settings:

Pick location Click the pick location icon and next click in your active view at the location where you want to place the well pad. This will populate the 'Well pad easting' and 'Well pad northing' text boxes.

Well pad easting  Specify easting location of the well pad.

Well pad northing  Specify northing location of the well pad.

GL  The elevation of the surface above Mean Sea Level. Only applicable for onshore wells. For offshore wells, you can leave this field blank. When the GL is above MSL, the elevation is a positive value; when the ground level is below MSL, the elevation is a negative value.

DF elevation above GL  The vertical measured distance from the topographic surface to the derrick floor.

Under 'Layout at Surface' you can specify the following settings:

Number of rows  Specify the number of rows in the well pad.

Slots per row  Specify the number of well slots in each rows.

Row spacing  Specify the distance between rows.

Slot spacing within row  Specify the distance between slots in a row.

Under 'Layout in Reservoir' you can specify the following settings:

Wellbore azimuth  Specify the angle between the orientation of the wells and the North direction.

Maximum horizontal well length  Specify the length of the horizontal section of the wellbore (distance from heel to toe).

Heel spacing  Specify the distance between the wells at the heel location.

Heel line azimuth  Check the checkbox to specify a uniform length of the wells withing the reservoir while the actual well trajectories have different lenghts. Next, fill in the angle between the line connecting the heel targets of the wells of the well pad and the North direction.

Wellbore trajectory in one direction  Check the checkbox if you want the wells to expand from the well pad in only one direction. Adding 180 degrees to the wellbore azimuth leads to the same wellbore orientation unless you select Wellbore trajectories in one direction.

On the Drilling Constraints tab, you can adjust the following settings:

Minimum KOP  Enter a minimum kick off point (KOP).

Anti-collision offset  Relates to the distance between two opposite wells in the well pad set-up at the turning point that marks the start of the landing section. To prevent the wells from intersecting, you can specify this anti collision offset, which moves the turning points away from each other in a direction perpendicular to the wellbore. Anti collision offset is not a very sophisticated parameter and does not, for example, take other, neighboring wells into account.

Boundary  Select a ‘feature’ boundary from the drop-down list, representing a lease boundary or reservoir map for example, to restrict the extension of the wells. If you do not have a boundary, the list will not be populated. For more information about boundaries, see Boundaries and Feature Sets.

Under 'Trajectory Calculation Method', which in this case uses the Fixed radius calculation method, further specify for all three sections of the well trajectory:

Maximum DLS  Specify the maximum DLS (dog leg severity) to be applied in that particular section of the well.

Maximum inclination  Specify the maximum inclination allowed in the well section.

On the Targets tab, you can specify the following settings:

Under 'Target'

Target TVDSS  Specify the TVDSS for the horizontal well sections.

Target zone  Specify a zone to which the horizontal section of the wells should be confined. Select a zone from the drop-down list or click the green + icon to open the Target Zone form and create one.

Under 'Extend' enter the following value:

Extend wellbores after final target  Specify how far the wellbores will be extended after the final target.

When you are done with all the settings, click OK to save the settings to the well pad. This will automatically take you to the Refine Well Pad step where you can adjust individual wellbore settings.