Risk assessment of surface vs subsea blowout preventers (bops) on mobile offshore drilling units focusing on riser failure and the use of subsea shear rams

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Title: Risk assessment of surface vs subsea blowout preventers (bops) on mobile offshore drilling units focusing on riser failure and the use of subsea shear rams
Author: Melendez, Jorge Luis
Abstract: The use of a slim , high -pressure drilling riser for surface blowout preventer operations in the deepwater Gulf of Mexico was assessed as an alternative to conventional drilling procedures from floating units . Comparison of the low - and high -pressure system was accomplished through a detailed qualitative (assigned frequency ) and quantitative (reported incidents ) risk analysis using generic fault tree models to statistically determine the reliability of the system based on metocean conditions from the Gulf of Mexico . It is hoped that this investigation will serve as a starting point for drilling companies and regulatory agencies to understand the risk of implementing a high -pressure riser for surface blowout preventer applications in the Gulf of Mexico , because specific failure events and conditions of the area were considered . Despite the generic description of the drilling riser and pressure control system , the models are flexible enough to be modified and adapted to a specific rig configuration and location . Results from the qualitative comparison suggest an acceptable risk and high reliability for high -pressure riser systems and surface preventers . The quantitative portion of the study is influenced by the data quality of the high -pressure system , however it provides a range of possible reliability values with an acceptable overall risk .
URI: http : / /hdl .handle .net /1969 .1 /3932
Date: 2006-08-16

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Risk assessment of surface vs subsea blowout preventers (bops) on mobile offshore drilling units focusing on riser failure and the use of subsea shear rams. Available electronically from http : / /hdl .handle .net /1969 .1 /3932 .

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