The uncontrolled blow-out of a well is one of the most critical accidents that can occur during both exploration and exploitation of hydrocarbon fields. Significant HSE issues are associated with this event that implies major safety risks for the field operators, potential health injury for the population living in the area and impacts on the environment. A complex methodology, for the blow-out event simulation, was developed by Eni E&P Division (in collaboration with TEA Group) in the framework of a specific R&D project (1998 to 2007), allowing the complete analysis of the phenomenology associated to blow-out events. Blowouts need to be evaluated through specific models: commercial packages may lead to a non-exhaustive analysis and, often, underestimate the effects of a blow-out. Many phenomena that occur during a blow-out event are not sufficiently treated in literature, since they necessitate experimental or CFD investigations for the development of specific models, integrated into the Blow-out software. In some cases literature/commercial models (free) have been selected after a state-of-the-art study, interfaced with the other models, and then integrated into the software. The main objective of the R&D project was the development of a user-friendly software, for a complete simulation of a blow-out event. The software was developed with Visual Basic and runs in Windows 95,98,2000 & XP operative system. The main goals of the software are: easy to use, different levels of use (depending on data available), short computational time (from 0 to 10 min, depending on complexity of the simulation). The main output of the software are: the blow-out flow-rate and the risk area associated to flammable gas dispersion (flash fire), thermal radiation (jet fire), toxic gas dispersion (H2S in case of unignited blow-out, SO2 and NOx in case of ignited blow-out), oil rain and ground contamination (individuation of the area that need remediation). Risk areas are indicated in terms of maps. This paper describes the software and the associated methodology, in terms of flow-chart, graphical users interface and an example of applications

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