Whenyoucannotmaintainthissafemarginyoumustsuspenddrill

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Unformatted text preview: egments removed from the BOP stack and the riser; (3) cleaning and examining components extracted during the removal of the rams; and (4) collecting and cleaning all solid objects found within the different ram cavities. DNV assessed the damage to the BOP stack in three different ways: (1) visual inspection and photo documentation; (2) dimensional measurements; and (3) three‐dimensional laser scanning. In addition, DNV used structural analysis and modeling to simulate drill pipe behavior in the wellbore. 339 4. ROV Intervention Operations Review DNV reviewed video footage and still photographs taken from a number of different ROVs that were used during attempts to stop the well flow. This review allowed DNV to assess the condition of the BOP stack when it was still submerged and to try to determine the origin of leaks in the BOP’s hydraulic circuitry. This review also allowed DNV to assess the impact of various ROV interventions on the condition of the BOP stack. 340 H. DNV’s Forensic Examination Findings DNV’s forensic examination found that, as the BSR was closed, the drill pipe was positioned such that the outside corner of the upper BSR blade contacted the drill pipe slightly off center of the drill pipe cross section. A portion of the pipe cross section was outside of the inte...
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