4.2.4.2 Data Model

The trajectory data object:

• Must reference its parent wellbore.
• Is a growing data object because as measurements are taken (at increased depth) that data is added to the trajectory.

• Includes a part_TrajectoryStation object to support streaming data with ETP.

• Has a GrowingStatus, which describes the growing status of the Trajectory (active, inactive or closed)

• Contains this data:

• Trajectory stations and measurement data recorded at each.
• The type of measurement tool used and related information.
• Trajectory station status, type, and related data for specific types.
• Directional drilling information and measurements.
• Calculated values and related uncertainty ranges.

• References a tool error model, which identifies inaccuracies of instruments or measurement systems related to the trajectory.