Storage tanks
Chapter 2 . Finding Oil (Upstream)
Once oil is found after
the preliminary exploration phase
and the drilling of exploratory wells, the
production phase can begin. There are two
forms of drilling: onshore and offshore.
Crude oil found underground is usually mixed
with water, sand, salt and natural gas. As it is
extracted, the pressure of these different
substances must be kept at just the right
levels. This is done by turning valves
on and off at the surface level.
Because these valves are often
green in colour and the small dials
are red, much like the pine trees
decorated at Christmas time, this
assembly is often referred to as
Christmas tree.
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