The Petroleum Industry, also known as the Oil Industry or the Oil Patch, includes the global processes of exploration, extraction, refining, transporting and marketing of petroleum products. It is comprised of cycles and activities that include looking for possible underground or underwater unrefined petroleum and flammable gas fields, drilling of exploratory wells and subsequently drilling working the wells that recover and bring the crude oil or raw natural gas to the surface. The oil and gas global supply-chain includes activities such as domestic and international transportation, ordering and inventory visibility and control, materials handling, import/export facilitation and information technology.