The BOP is a complex construction with multiple parts and systems integrated. Any single failure will affect the overall functionality of the BOP. A key question will always be whether a particular failure has such an adverse effect on the overall functionality that the BOP needs to be pulled for repair and hence drilling halted. The presentation will outline how a BOP is broken down into a detailed fault tree. The fault tree is modeled in the software tool RiskSpectrum® originally developed for assessing process safety of nuclear power plants. Once a failure of any part in the BOP assembly is detected, the information is fed into the model, and the effect on the overall availability of the BOP is evaluated through a predefined methodology. The results are displayed to the crew onboard through any easy to understand mimic. The operating crew onboard an offshore drilling unit can then continuously monitor the availability of the BOP and make decision on their further actions based on real time facts on BOP status.

The BOP model has been developed under a contract with and funding from a major drilling operator and Lloyd’s Register, with BOP manufacturers being directly involved. US Authorities has been kept informed on the development. A joint industry panel with representative from Mobile Drilling Unit Owners, BOP manufacturers and Operating Companies has been overseeing the work.

The model has been launched and training of the operators has been carried out. Results from the implementation will be available at the presentation at the conference.

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