Abstract
Under pressure and activity difference between drilling mud and poro fluid, the degredation of mudstone mechanic features will change with the saturation time. It reveals that the reduction of the mudstone strength parameter and the decrease of the elastic modulus are the results of hydration stress development after the mudstone hydration. This paper proposed that the damage of soft mudstone is caused by the hydration stress development. After introduced the internal damage variable in the linear constitutive equations of viscoelastic materials, the approximate equation about the changing rate of the internal damage variables and the changing rate of the hydration stress can be got.
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