As home to supermajors, as well as a plethora of smaller, independent energy players, the US boasts one of the largest concentrations of energy personnel in the world. With its insatiable appetite for energy resources, the United States is the world's single largest consumer of oil, using as much as 20.73 million barrels per day as of 2008. Recently, interest has peaked in the vast quantity of untapped natural gas resources in the US, the reserves of which were inventoried in 2008 at 238 Tcf, with producers specifically targeting the nation's promising shale formations for this energy commodity.
The Oiler is an unlicensed member of the engine room on board a ship or vessel and one of the most junior members of the crew. Traditionally, the position involved oiling or lubricating machinery, although in modern times duties will be similar to that of a Junior Ships Engineer.