Background
 Blowouts
occur in both oil and natural gas wells. A blowout
is an uncontrollable release of oil or natural gas due to a pressure
gradient. Iconic blowouts are usually pictured as oil gushing from the top of a well.
Blowouts were a common occurrence in high
pressure reservoir oil exploration before
pressure control systems were created in the
1920s.
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These new control systems allowed reservoir under
high pressure to be  controlled.
Sometimes these systems fail
and extreme measures have to
be taken to control a well. Blowouts are extremely
dangerous and have enough pressure to send drilling
strings out of the well and can cause a lot of
damage. The dangers and techniques used to control
and maintain well stability
while drilling is a lot of work and there is a good
amount of physics behind the whole process.
http://www.sjvgeology.org/history/gushers_world.html
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