There are many companies in the United States that engage in the heating and oil service including BP, Exxon, Shell, Chevron, ConocoPhillips and Total. Most of these firms also have a vast presence internationally and produce large volumes of oil per year.
The reputable oil companies have an extensive network of producers and suppliers who distribute oil to various parts of the country. According to Statista.com, the major companies are also present in most phases of the industry from exploring to refining, distribution marketing of heat and oil products. Other companies that are top producers of oil include Occidental Petroleum, Anadarko Petroleum, The Apache Corporation, Amerada Hess and XTO Energy. Most of these companies are based in the United States, but the majority have a wide presence in the international oil market.