Wintershall has developed a Drilling Complexity Index (DCI), which is a tool that is used to measure the complexity of a well. It is an early warning indicator and a measurement of how easy or difficult a specific well can be delivered. The DCI can be used at any phase of the well delivery process; from the pre-screening or conceptual phase through the detailed design phase to the execution phase.

Wintershall's HQ based Best Practice unit for Well Engineering (ESW) used well data from existing databases to compare the DCI to other complexity indexes. Furthermore, ESW analyzed the impact of the DCI on key performance indicators (KPI) such as non-productive time (NPT), cost per meter, and meter per day. This paper will present the work performed and the results that show a strong impact of the DCI on all the above cited key performance indicators.

This DCI tool was initially planned to be used by drilling teams to plan wells. Following its successful development and roll out in the drilling groups, Wintershall looked at ways to expand its use and quickly realized that its usefulness extend beyond the drilling groups.

This paper will further describe how the DCI can be used for the following purposes:

  • Predict NPT of drilling projects based on DCI

  • Determine the time contingency for a well

  • Determine the cost contingency of a well

  • Trigger peer-assists, well examination and staffing of well projects

  • Support role in the project approval process

  • Portfolio management

The work which will be presented has accelerated the acceptance and the utilization of the DCI tool within Wintershall, and represents a significant improvement in assessing the inherent risks and hazards and potential consequences for exploration/appraisal/development wells.

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