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• W2052205900 abstract "Abstract Saving time and money are the results of the stable bore hole design. During drilling there are two main instability problems, namely, bore hole collapse and fracture. The consequences of these drilling problems are severe, even the most simple bore hole collapse or break down can lead to the loss of millions of dollars in equipment and valuable natural resources. The main aspect of the well bore stability analysis is to mitigate these drilling problems. This is typically investigated by a constitutive model to estimate stress around the well bore, coupled with failure criterion. The objective of this study is to develop a model to widen the operating mud window by increasing the shear strength which involves reducing the minimum mudweight required to keep the hole open, and also increasing the near – wellbore compressive tangential stress which is coupled with the increase in maximum mudweight prior to fracture initiation. The most common approach for stability analysis is a linear elastic and isotropic constitutive model in conjunction with linear failure criteria like Mohr-Coulomb. The Mohr- Coulomb failure criterion only involves the maximum and minimum principle stresses and therefore assumes that the intermediate principle stress has no influence on rock strength. In addition, it is believed that the fluid barrier, and a part of the bore hole wall, behave plastically which provides higher fracturing pressure than conventional elastic theory. In this paper, a model for the mud weight window determination, using Mogi-Coulomb failure criterion and the elasto plastic model is developed. This is based on the hypothesis that, indeed elastic constitutive model does not fit with the reality of the well bore wall behavior and intermediate principle stress plays an important role on rock strength. This model leads to easily computed expression for the critical mud pressure required to maintain well bore stability and obtain a wider mudweight window for borehole strengthening during vertical and deviated well operations." @default.
• W2052205900 created "2016-06-24" @default.
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• W2052205900 date "2011-07-30" @default.
• W2052205900 modified "2023-09-26" @default.
• W2052205900 title "Wellbore Strengthening and Borehole Stability: A Geomechanical Model to Increase the Thin Mudweight Window in Vertical and Deviated Wellbores" @default.
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• W2052205900 doi "https://doi.org/10.2118/151078-ms" @default.
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