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5Tixier M P, Loveless G W, Anderson R A. Estimation of formation strength from the Mechanical properties Log[R]. SPE--AIME, 1973.
6Montmayeur H. Prediction of static Elastic/Mechanical Properties of Consolidated and Unconsolidated Sands from Acoustic Measurements:Correlations [R]. SPE15644, 1986.
7Steiger. Methods for determining in situ shale strengths, elastic properties, pore pressures, formation stresses, and drilling fluid parameters [P] .U.S. Patent 5, 205, 164.
8Santarelli F J. Wellbore Stability Analysis made easy and practical [R]. SPE35105, 1996.
9Zausa F, Civolani L, Brignoli M, et al. Real--Time Wellbore Stability Analysis at the Rig--Site [R]. SPE37670, 1996.
10Santareli F J, ea tl, Formation Evaluation from Logging on Cuttings [R]. SPE36851, 1996.
