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A relief well is a well drilled to intersect an oil or gas well that has experienced a blowout. Specialized liquid, such as heavy (dense) drilling mud followed by cement, can then be pumped down the relief well in order to stop the flow from the reservoir in the damaged well.
- "How a relief well works | Gulf of Mexico response | BP". Retrieved 2010-05-16.
- "IEEE Spectrum: How to Drill A Relief Well". Retrieved 2010-08-05.
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