The denser mud had been, up until this time, the primary pressure control and was keeping the hydrocarbons in place despite the lack of an adequate cement job at the casing shoe.
WSJ: The Oil Disaster Is About Human, Not System, Failure
It matters not how good the cement job or the plug and cement for abandonment, both cement and casing will deteriorate over time and eventually fail.
FORBES: The Fracking Solution Is A Good Cement Job
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