A risk evaluation methodology, so-called interval probability analysis, was used for drilling decisions associated with an overpressure area. The technique incorporates geologic and geophysical studies with the well construction, safety and planning decisions prior to selecting a well for drilling. The analysis used a rigorous process to elucidate and define the areas of uncertainty associated
... [Show full abstract] with each component of the process. A significant impact of the study was the change in the perception of risk in the prospect area. The reduction in drilling costs was found to be equivalent to the drilling cost for an additional well.