Oil drilling rig Oil drilling rig. Worker climbing an onshore oil drilling rig. These are used when an initial survey has indicated the presence of oil. The rig drills the large bore holes for tapping the oil. Stock Photo - Afloimages
Oil drilling rig. Worker climbing an onshore oil drilling rig. These are used when an initial survey has indicated the presence of oil. The rig drills the large bore holes for tapping the oil.