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Unformatted text preview: ditions required to establish circulation damaged the float collar; (2) the float collar failed to convert due to insufficient flow rate; and (3) the check valves on the float collar failed to seat due to damage, contamination, or the presence of debris. None of these float collar failure scenarios excludes the possibility that the cement could have failed due to defective cement design, contamination of the cement by mud in the wellbore, commingling of cement with nitrogen due to nitrogen breakout from the nitrified foam cement slurry, swapping of the shoe track tail cement with the heavier mud in the rathole, a clogged reamer shoe that possibly altered cement flow‐out of the reamer shoe, or some combination of these factors. The forensic examination of the BOP stack found interior erosion of the blind shear rams, which supports this flow path as the most likely scenario. This erosion detected on the blind shear rams likely resulted from the high pressure flow of hydrocarbons past the rams as a result of the blowout and indicates that hydrocarbons flowed up the well after entering through the shoe track. 6...
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This note was uploaded on 01/18/2014 for the course BEPP 305 taught by Professor Nini during the Fall '11 term at UPenn.

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