Risk assessment framework on Deepwater drilling well to prevent of blow out consequences

Deepwater drilling involves complex operations and equipment, so it is faced with various operational challenges including well control accidents. This paper proposes a risk assessment framework for evaluating the safety of Deepwater drilling operations. The risk assessment process includes: constructing fault in Ultra-Deepwater drilling to analyze risk factors leading to a blowout accident, developing risk assessment framework based on the predicted risk matrix and node, and risk assessment analysis to assure the safety of well control operation. The proposed framework includes risk factors about kick cause, HAZID Scenarios, Risk and Barrier Assessment Workflow, HAZID Recommendations and Additional Risk Assessment Work, which covers the majority of reasons of a blowout. The proposed model could analyze the risk of blowout more comprehensively and the influencing degree of these four phases could also be clarified. Besides, the modelling method could update the structure and parameters of the developed model easily if new factors or data are added. The results show some causes has the greatest impact on blowout accidents, what should be done to prevent it. Mutual information analysis and uncertainty analysis is performed to investigate the effects of risk factors on blowout. Finally, the barrier elements and the attribute checklists are summarized.

Keywords:

Deepwater Drilling , Risk Assessment , HAZID Factors