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Unformatted text preview: 4 143 DNV discounted this theory for a number of reasons. First, under this theory, someone on the bridge would have had to activate the BSR normal close function from the toolpusher’s control panel or the driller’s control panel. DNV concluded that no witness testimony supported this. Second, DNV pointed to the testimony of Chris Pleasant, the Transocean subsea engineer, who testified that the BSR was in an “open” state when he arrived at the bridge at approximately 9:56 p.m. This was further evidence that no one had activated the “close” function. The second theory advanced was referred to as the “double clutch” theory, which posited that the solenoid of the ROV supplied just enough pressure to the hydraulic port on the BOP to cause the BSR to go only partially into the wellbore. 356 The Cameron representative described this as follows: Also, there were at least a handful of cases during the course of the intervention in which the shear rams were double clutched. In other words, pressure was applied to the BOP and...
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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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