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a relief well is 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.
A Relief Well is a well that is drilled to control the sudden explosion of oil and natural gas. This type of well is generally a secondary well, dug at some distance from the real drilling site. It consists of troubled piping to control the flow of pressurized liquid.