[[Drilling rig in a small oil field
Near
Sarnia, Ontario, 2001]]
An
oil field is an area with an abundance of
oil wells extracting
petroleum (oil) from below ground. Because the
oil reservoirs typically extend over a large area, possibly several hundred
kilometres across, full exploitation entails multiple
wells scattered across the area. In addition, there may be exploratory wells probing the edges, pipelines to transport the oil elsewhere, and support facilities.
Because an oil field may be remote from civilization, establishing a field is often an extremely complicated exercise in
logistics. For instance, workers have to work there for months or years and require housing. In turn, housing and equipment require electricity and water. Pipelines in cold areas may need to be heated. Excess
natural gas needs to be burned off if there is no way to make use of it, requiring a furnace and stacks, and pipes to carry it from well to furnace.
Thus, the typical oil field resembles a small self-contained city in the midst of a landscape dotted with
drilling rigs and/or the pump jacks known as "
nodding donkeys" because of their bobbing arm. Several companies, such as
Bechtel and
Halliburton, have organizations that specialize in the large-scale construction of the
infrastructure required to operate a field profitably.
More than 40,000 oil fields are scattered around the globe, on land and offshore. The largest are the
Ghawar Field in
Saudi Arabia and the
Burgan Field in
Kuwait, with more than 60
billion barrels (10 km³) estimated in each. Most oil fields are much smaller.
In the modern age, the location and proven
reserves of oil fields are a key underlying factor in many geopolitical
conflicts.
See also
Category:Peak oil
Category:Petroleum
es:campo petrolífero
ja:油田
no:Oljefelt