Target Line Dip Angle Adjusted For Azimuth Changes
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Software handling geo-steering updates has traditionally struggled with any azimuth change in the lateral due to the dip angle being retained during the turn, resulting in a plan which does not sit within the targeted geological plane.
As of version 3.0.0.11, when using the Create Offset Plan, or Rogii Star Steer integration features, Well Seeker X gives the user the option to either hold a target line dip angle regardless of azimuth change, or automatically adjust the dip angle of the target line where an azimuth change occurs in the original plan after the target line change.
This document will explain the logic and the changes.
The user can select can select one of two sets of logic when creating a offset plan or using the Rogii Star Steer integration. This can be done in the Settings > Adjust dip on azi option.
Both options are detailed below.
The Create Offset Plan tool creates a new plan line which will retain the new dip angle value, regardless of the azimuth change. For large azimuth changes, or small azimuth changes over large course lengths, this will result in the new target line deviating from the intended geologic plane.
Red = 90° dip well for reference.
Blue = Target line plan change with a 94° dip using the hold dip logic. 94°dip retained throughout, resulting in deviation from the formation plane.
Although in theory this option will result in deviation from the intended geological place, it gives the user the option to match the clients geosteering team’s numbers when they are also using this logic.
The Create Offset Plan tool will recalculate the dip angle value incrementally as the azimuth changes. This keeps the plan and target line in the same plane as geologically intended.
In the below U-zontal example the plan update has a 95° dip angle on a 0° azimuth. As the azimuth changes from 0°, the dip angle also changes to remain in the same dip plane as the target line change intended.
Red = 90° dip well for reference.
Blue = Target line plan change with a 94° dip using new logic. 94°dip retained until azimuth change detected. Dip angle is then adjust to remain in the intended formation plane.
The comparison below clearly shows the difference between the two methods.
Red = 90° dip well for reference.
Magenta = Target line plan change with a 94° dip using the hold dip logic. 94°dip retained throughout, resulting in deviation from the formation plane.
Blue = Target line plan change with a 94° dip using the adjust dip logic. 94°dip retained until azimuth change detected. Dip angle is then adjusted to remain in the intended formation plane.
In addition, the display logic for the Target Zone that can be viewed on the plots has been updated. There are two scenarios:
Geo-Steering Updates table is blank. A 20ft up/down, 40ft left right target zone will be displayed around the principal plan trajectory.
Geo-Steering Updates table is populated. Geo-steering data will be displayed on the plots as per the table data.
Well Seeker X can now seamlessly calculate geo-steering target line and plan changes that involve azimuth changes in the lateral and gives the user the flexibility of choosing when to use this feature. Combined with the improved target zone visuals, this makes it the perfect tool for complex U-zontal wells and simple lateral azimuth adjustments alike.
