Deviation Classification This is a classification of wellbore shape. It captures the significance of the deviation from vertical. The descriptions of each item are not standard definitions. deviationType extDeviationType refinedDeviationType refinedExtDeviationType POSC 1.0 vertical The wellbore does not deviate significantly from the vertical. The surface to bottom line is not more than 5 degrees from vertical. deviated The surface to bottomhole line is more than 5 degrees from vertical. horizontal A significant length near the bottomhole of the well does not vary from horizontal by more than 10 degrees. build and hold . double kickoff . S-shaped .