Summary

The stress and formation anisotropy in a West Kazakhstan field was analyzed using DSI and imaging log data. The anisotropic parameters obtained using the field data was compared with the isotropic stress and formation properties. Drilling margin was constrained using a Biot coefficient in the range of 0.8 to 1.0 along with isotropic and/or anisotropic formation properties derived and calibrated using vertical and horizontal drilling data from the field, the geological model and well logs. The Mogi-Coulomb rock failure criterion was used in the numerical wellbore stability model. The results of our analysis and comparison to stability analysis of the field data indicates that the formation anisotropy significantly impacts the wellbore stability model developed in this study for West Kazakhstan field.

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