Integration of Drilling History and Borehole Images for Well Completion Improvement

Borehole stability is key for subsurface disciplines to ensure that subsurface data can be acquired with suffcient detail. Our client NAGRA was relying on stable borehole conditions, as due to extensive coring and testing during their multi-well campaign their borehole remained open for a long time.

In few of their wells our client experienced severe circulation losses causing massive delays and even abandonment of the boreholes.

NiMBUC was asked to perform a study to

  1. identify the zones where circulation losses were likely to occur
  2. to design safe mud windows
  3. propose adjusted completion schemes for following boreholes

We used available drilling event records and a correlation with borehole image data and cores to answer these questions.

Methods used

switzerland map

With the help of borehole images zones and geological formations were identified in which mud lossed were likely to occur. Also the mechanisms, by which the mud losses took place, were identified and connected to the data from the drilling reports. The gained results allowed our client to better plan and design the following wells to prevent drilling and circulation loss problems.

Mario Habermüller

Senior Geologist
+13 years experience
responsible for Structural Studies, Geomechanical Studies and Processing

+43 664 2440612


Summary of the 83rd EAGE conference publication concerning the well completion improvement for NAGRA

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