across the BOP bore was to be effected and thus seal off the entire throat of the BOP. The BSR was, by design, a device of last resort in a hierarchy of well control strategies: when all else failed, the BSR was to slice the drill pipe and seal the well. Even if no drill pipe was present in the BOP system, the BSR was designed to seal the well when the “scissor blades” passed by each other and into the side packers.


FIGURE 3-1 Deepwater Horizon BOP port side. Source: DNV 2011a, I, p. 14. Reprinted with permission; copyright 2011, DNV.

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