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- W2041103246 abstract "Abstract Borehole stability has played an important role in the evolution of long and deep wells in later years. Borehole collapse and circulation losses are costly problems for the entire drilling industry. It is often assumed that high borehole inclination leads to lower mud weight margins. To investigate this aspect, a study of borehole stability in 3-dimensional space was undertaken. This paper presents results and applications of the findings in this study. The in-situ stress state plays a key role for borehole instability. The stress state is usually classified as normal fault, strike/slip fault and reverse fault stress states. One major conclusion of the study was that optimum stability was obtained for a lithostatic stress state, which is where all 3 normal borehole stresses are equal. For this case the window between fracturing and collapse was maximum. Bounds on the magnitude of the in-situ stresses were also invoked, resulting in a constrained 3-dimensional model that covered both fracturing and collapse pressures. Studying both fracturing and collapse pressures, it was found that maximum hole stability could be obtained at intermediate orientations, and that they are controlled be the magnitude and directions of the in-situ stresses. Field cases are also presented in the paper. It is shown that under optimal conditions combination of wellbore inclinations and azimuths can give the highest wellbore stability. The 3-dimensional fracture and collapse model presented is an efficient tool for well path optimization. Platform placement and planning of difficult wells can be improved by using this method. It is presented as analytical equations, and can easily be implemented in a calculator." @default.
- W2041103246 created "2016-06-24" @default.
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- W2041103246 date "2005-10-09" @default.
- W2041103246 modified "2023-10-14" @default.
- W2041103246 title "Optimization of Borehole Stability Using 3D Stress Optimization" @default.
- W2041103246 cites W1992904148 @default.
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- W2041103246 doi "https://doi.org/10.2118/97149-ms" @default.
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