ABSTRACT: Performing geomechanical analysis before spudding a well to establish the safe mud-weight window is a quite common practice in the industry. However, updating the predrill model with new data acquired after the well is drilled is still less common, especially if no major difficulties were encountered while drilling. The presented case study shows that differences between predrill expectations and postdrill observation could be in some cases significant. The objective of this study was to improve the geomechanical knowledge of the field, predict and evaluate geomechanical-related drilling risks, and propose counter measures to aid in near future and long-term drilling activity. After field operations were completed, newly obtained data were used to improve the model, to avoid or mitigate wellbore stability problems in future wells.
Predrill vs. Postdrill Geomechanical Model in a Structurally Complex Area: Uncertainty Evaluation in Wellbore Stability Analysis
Kepinski, M., Derda, R., De Gennaro, V., and I. Diaz-Granados. "Predrill vs. Postdrill Geomechanical Model in a Structurally Complex Area: Uncertainty Evaluation in Wellbore Stability Analysis." Paper presented at the ARMA/DGS/SEG International Geomechanics Symposium, Virtual, November 2021.
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