| 
        
        
        
        Trajectory #1
        
     | 
    
        
     | 
    
        belongs to
        
     | 
    
        
        
        Current Operation #1
        
     | 
    
        
     | 
    
        Edit
        Delete
        Update
        Cancel
     | 
    | 
        
        
        
        Wellbore #1
        
     | 
    
        
     | 
    
        has a
        
     | 
    
        
        
        Trajectory #2
        
     | 
    
        
     | 
    
        Edit
        Delete
        Update
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     | 
    | 
        
        
        
        Trajectory #2
        
     | 
    
        
     | 
    
        is measured using
        
     | 
    
        
        
        Survey instrument gyro based #2
        
     | 
    
        
     | 
    
        Edit
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     | 
    | 
        
        
        
        Distance log #1
        
     | 
    
        
     | 
    
        is estimated using
        
     | 
    
        
        
        Trajectory #2
        
     | 
    
        
     | 
    
        Edit
        Delete
        Update
        Cancel
     | 
    | 
        
        
        
        Wellbore #1
        
     | 
    
        
     | 
    
        has a
        
     | 
    
        
        
        Trajectory #1
        
     | 
    
        
     | 
    
        Edit
        Delete
        Update
        Cancel
     | 
    | 
        
        
        
        Trajectory #2
        
     | 
    
        
     | 
    
        is extended to
        
     | 
    
        
        
        Bottom Hole Depth #1
        
     | 
    
        
     | 
    
        Edit
        Delete
        Update
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     | 
    | 
        
        
        
        Trajectory #1
        
     | 
    
        
     | 
    
        is measured using
        
     | 
    
        
        
        Survey instrument gravity based #1
        
     | 
    
        
     | 
    
        Edit
        Delete
        Update
        Cancel
     | 
    | 
        
        
        
        Distance log #1
        
     | 
    
        
     | 
    
        is estimated using
        
     | 
    
        
        
        Trajectory #1
        
     | 
    
        
     | 
    
        Edit
        Delete
        Update
        Cancel
     | 
    | 
        
        
        
        Trajectory #1
        
     | 
    
        
     | 
    
        is extended to
        
     | 
    
        
        
        Bottom Hole Depth #1
        
     | 
    
        
     | 
    
        Edit
        Delete
        Update
        Cancel
     | 
    | 
        
        
        
        Trajectory #2
        
     | 
    
        
     | 
    
        belongs to
        
     | 
    
        
        
        Current Operation #1
        
     | 
    
        
     | 
    
        Edit
        Delete
        Update
        Cancel
     |