code: def update_well_positions(self):
          
          for well in self.wells:
              well_x = well.attrib['WellX']
              well_y = well.attrib['WellY']
  
              first_field = self.well_fields(well_x, well_y)[0]
  
              x_start = first_field.FieldXCoordinate.text
              y_start = first_field.FieldYCoordinate.text
  
              well.attrib['FieldXStartCoordinate'] = x_start
              well.attrib['FieldYStartCoordinate'] = y_start
docs: Set ``well_attrib['FieldXStartCoordinate']`` and
          ``well_attrib['FieldYStartCoordinate']`` to FieldXCoordinate and
          FieldYCoordinate of first field in well.