One of the most frequent and important hazards in petroleum operations is the risk of a blowout in drilling operations, result of an uncontrolled inflow of gas, oil or other fluids in the well. This occurrence is defined as an intrusion of unwanted fluid from a permeable formation into the drilling area once the bottom hole pressure becomes lower than the pore pressure. Consequently, controlled or uncontrolled wellbore events, when they occur, are not only a waste of time and money but can also lead to human, material and environmental damage, or even to a disaster. Through this study, we are trying to better understand the risks inherent to the use of a blowout preventer, to better control them throughout its life cycle and to reduce their effects without totally eliminating them.

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