 It is owned by the State of Alaska, and is the largest oil field in the United States, covering and originally containing approximately of oil.The field is operated by BP; partners are ExxonMobil and ConocoPhillips Alaska.In the field, oil is moved through pipelines from about 1000 wells, to a pumping station at the head of the Trans-Alaska Pipeline; "flow lines" carry oil from the wells to local processing centers where the oil is prepared for long-range transport through the pipeline by removing water and gas; "transit lines" then carry the oil to the pumping station.