In order to optimize wellbore shear failure criteria，this article，comprehensively，evaluated the application characteristics of Mohr-Coulomb criterion，MG-C criterion and E.MG-C criterion. Combining with stress distribution around the borehole inelastic strata，we investigated the wellbore stability critical bottom hole pressure variation with azimuth and inclination. Results show that the predicted pressure of M-C criterion which omits the intermediate principal stress is partial conservative，while the prediction results of linear MG-C criterion get the lowest collapse pressure；the results of E.MG-C criterion，which considering nonlinear rock failure characteristics in the high-stress area，have a middle value，but its prediction collapse pressure of wells with high angle is lower than the result of MG-C criterion. This feature reflected the influence of nonlinear rock failure characteristics to wellbore stability. Under altered in situ stress states，the optimal well trajectory always located in the maximum and minimum principal stress plane and parallel or inclined to the direction of maximum stress. The in situ stress distribution and the actual space state of the borehole also largely determine the stability of the borehole. The research in this paper is useful to provide more accurate and comprehensive advices.
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2017, Vol. 36 
