Applying quantitative risk assessment to casing design

In 1993 British Gas decided that it would be advantageous to explore the possibility of developing a new casing design methodology, based on probabilistic concepts and historical data. This became necessary in order to align drilling design practice with that of other disciplines within the E&P group. For example, it was considered uneconomic to design a well to last for ever when platform life-spans were of the order of twenty years.. To date, British Gas has been encouraged by its findings, and the potential benefit from such an approach, demonstrated through initial studies into current casing designs.