Table 1 - uploaded by Roland I. Nwonodi
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Source publication
In order to predict wellbore instability in the Niger Delta basin, there are several important rock failure criteria available in 3D, which produce different results as they were developed on the basis of different hypotheses. The geomechanical data used to develop these criteria were obtained from the Gulf Coast, the North Sea, and the Asia Pacifi...
Context in source publication
Context 1
... alternative having the smallest net error was taken as the most accurate. The discrepancy table, Table 1, is a display of the absolute value of the discrepancies between pairs of alternatives. This table is an nXn arrangement of cells, where n is the number of pairs considered in the study. ...
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Citations
An important step in borehole stability analysis is to estimate a safe and stable mud weight window. A rock failure criterion is required for this purpose. Mud weight windows define the mud program and the number of casing set points thus improving well control and the economy of the drilling project. The aim of this paper is to derive analytical equations for estimating the values of mud pressure corresponding to low and high mud weight shear failures for various modes of stress state using a modified polyaxial Mohr–Coulomb failure criterion. The results are then compared with those of the Mohr–Coulomb and Mogi–Coulomb failure criteria as well as modified 3D Mohr–Coulomb B failure criterion. Also through some case studies, this paper investigates the applicability and efficiency of this failure criterion in predicting values of mud pressure corresponding to shear failure at the borehole walls.
