Well Facility Type wellFacType extWellFacType refinedWellFacType refinedExtWellFacType POSC 1.0 well The facility is a well, which consists of all the wellbores associated with the surface drill hole. wellbore The facility is a wellbore, generally considered to be the entire facility from the bottomhole to the surface. A well may have many wellbores. completion A single producing facility within a wellbore. A well or wellbore may have many completions.