Chemical and Thermal Effects on Wellbore Stability of Shale Formations

The model presented in Chapter 2 is compared with experimental data presented by Ewy and Stankovich [2000]. It is shown that the relative magnitude of the hydraulic conductivity of the shale (KI), the membrane efficiency of the shale (KII), and the effective diffusion coefficient of solute (Deff) all have an influence on the net pore pressure behavior of a shale exposed to a drilling mud. After the model has been calibrated with one set of experimental data, excellent predictions under other operating conditions can be made. Good agreement with experimental data is obtained for such predictions.

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