The present study focuses on the description of a methodology that is used to elaborate a complete analysis of a blowout in the field of Mexilhao, which is the largest undeveloped gas accumulation in Brazil.

The methodology comprises a hazard and operability analysis (HAZOP) and a quantified risk assessment (QRA), which are necessary processes for identifying and prioritizing potential hazards. In addition, the combination of the HAZOP with the QRA makes easier the introduction of appropriate measures for reducing overall operational risks. Besides those activities, some details of a blowout contingency plan are presented, including bubble plume calculations, relief well planning, and dynamic killing design.

Keywords:
well control, drilling fluid, annular pressure drilling, iadc spe 99164, Upstream Oil & Gas, high-rate subsea gas well, hazard, fault tree, well control event, Mexilhao
Subjects:
Drilling Operations, Pressure Management, Well & Reservoir Surveillance and Monitoring, Reservoir Characterization, HSSE & Social Responsibility Management, Safety, Risk Management and Decision-Making, Well control, Contingency planning and emergency response, Operational safety
Copyright 2006, IADC/SPE Drilling Conference
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