In 2005 alone, the US produced an approximate 9,000,000 barrels of crude oil a day and imported 13.21 million barrels every day from other countries. This oil gets refined into gas, kerosene, heating oil and other products. To keep up with our consumption, oil corporations must continually look for new sources of petroleum, as well as improve the production of existing wells.
An oil well is a general term for any boring through the Earth's surface built to find and produce petroleum oil hydrocarbons. Generally some natural gas is produced with the oil, and a well built to produce principally or only gas may be named a gas well.
The term can refer to land-based oil rigs, or a marine-based structure ordinarily called an 'offshore rig'. The term properly refers to the plant that drills the oil well including the rig derrick (which looks like a metal frame tower ). Laypeople also refer to the structure on that the oil rigs and from which the wells produce as a 'rig', but this isn't correct. The right name for the structure in a marine environment is platform.
In early oil exploration, drilling rigs were semi-permanent in nature frequently being built on site and left in place after the completion of the well. In more recent times drilling rigs are expensive custom built machines that are capable of being moved from well to well. Some light duty drilling rigs are similar in nature to a mobile crane though these are more usually used to drill water wells. Larger land rigs must be damaged apart into multiple sections and loads to move to a new location, a process which can frequently take weeks.
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