WITSML - Operations Activity Component Schema Date and time that activities started. Date and time that activities were completed. The activity duration (commonly in hours). Phase (large activity classification) e.g. Drill Surface Hole. A code used to define rig activity. Custom string to further define an activity. Classifier (Planned, Unplanned, Downtime). Measured Depth at start of activity. True Vertical Depth at start of activity Measured Depth at end of activity. True Vertical Depth at end of activity. Measured depth of bit at start of activity. Measured depth of bit at end of activity. Finish, interrupted, failed, etc. Operator company name. A pointer to the tubular related to this activity. Is the activity optimum. Values are "true" (or "1") and "false" (or "0"). Does activity bring closer to objective. Values are "true" (or "1") and "false" (or "0"). The item state for the data object. Comments and Remarks. Unique identifier for the activity.