Statistics on Wells in the Netherlands - What Do We Learn?

With access to virtually all E&P welldata in the Netherlands, EBN is in a unique position to extract learnings and to compile statistics on drilling performance and subsurface parameters. This presentation gives an overview of well success ratios and creaming curves. Also drilling surprises have been analysed and linked to certain types of -operational- incidents. Via the concept of the Drilling Incident Triangle a classification scheme is presented that allows capturing of drilling hazards efficiently. Other learnings are based on the comparison of reservoir parameters that have been prognosed pre-drilling with the actual measurements post-drilling. One remarkable finding is that reservoir depth prognosis appears systematically off. Statistically the reservoir comes in deep with respect to prognosis, having a negative impact on volumes and/or productivity. A hypothesis based on selection bias that might explain these observations is presented.