If pressure bleeds off there is clearly a problem with the pressure integrity of the shoe, However, industry practice dictates that a positive test, that is no pressure drop, is not diagnostic, simply because the reservoir pressure is sufficient to retain the pressure being applied.

WSJ: The Oil Disaster Is About Human, Not System, Failure

Shares in athletic shoe companies may come under pressure after global industry leader Nike on Friday missed profit forecasts and fell by 9.4% in New York trading.

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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