New Analytical Model for Predicting the Unstable Zone Around the Borehole
- Mohamad Heidarian (Shahid Bahonar University of Kerman) | Hossein Jalalifar (Shahid Bahonar University of Kerman) | Mahin Schaffie (Shahid Bahonar University of Kerman) | Saeed Jafari (Shahid Bahonar University of Kerman)
- Document ID
- Society of Petroleum Engineers
- SPE Journal
- Publication Date
- December 2014
- Document Type
- Journal Paper
- 1,177 - 1,183
- 2014.Society of Petroleum Engineers
- 1.7.1 Underbalanced Drilling, 1.11 Drilling Fluids and Materials, 1.6 Drilling Operations, 1.11.2 Drilling Fluid Selection and Formulation (Chemistry, Properties)
- instability, Mouhr–Coulomb, optimal mud weight, analytical model, poroelastic
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- 366 since 2007
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In this study, a new analytical model, which is computationally lower in cost than current numerical methods, is presented to calculate the radius of the plastic zone around the borehole in underbalanced drilling (UBD) to prevent borehole instability. With this model, it is also possible to analytically calculate the optimal drilling-mud weight, which is the amount of mud weight with no plastic zone. The presented model is based on the Mouhr–Coulomb failure criterion. The model can be used in both vertical and inclined wells and in poroelastic formations with anisotropic horizontal stresses. Predictions from the model provide a reasonable match to the field data and numerical solution results.
|File Size||575 KB||Number of Pages||7|
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