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They will intersect the wellbore close to total depth and pump heavy mud up the original well to kill it. The heavy mud provides sufficient hydrostatic pressure to overcome the formation pressure. This would be followed by cement to ensure flow stoppage. This is the theory at least. I assume 2 wells are being drilled in case there are problems with one of the relief wells ie redundancy.
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1987 Carrera, Venetian Blue.
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