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Unformatted text preview: 10, did not fully identify and evaluate the risks inherent in the operations that were being conducted at Macondo. On April 20, BP and Transocean personnel onboard the Deepwater Horizon missed the opportunity to remedy the cement problems when they misinterpreted anomalies encountered during a critical test of cement barriers called a negative test, which seeks to simulate what will occur at the well after it is temporarily abandoned and to show whether cement barrier(s) will hold against hydrocarbon flow. The rig crew conducted an initial negative test on the production casing cement job that showed a pressure differential between the drill pipe and the kill line, which is a high‐pressure pipe leading from the BOP stack to the rig pumps. This was a serious anomaly that should have alerted the rig crew to potential problems with the cement barrier or with the negative test. After some discussion among members of the crew and a second negative test on the kill line, the rig crew explained the pressure differential away as a “bladder effect,” a t...
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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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