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Runkelstoss's avatar

There is another aspect to consider. Crude oil that cannot be processed, stored, or shipped is not extracted. What is to be done with it?

Oil wells cannot simply be turned on or off like a water tap.

High pressure:

Underground, crude oil is often under immense pressure. Closing a valve carries the risk that the pressure could damage the wellbore or cause the oil to leak uncontrollably elsewhere.

Fluids:

To stop the flow, wells must be laboriously flooded with heavy drilling mud and permanently sealed with multiple concrete plugs.

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