The Damage and Deformation Mechanism of Soft Mudstone in Drilling Engineer

Hui Zhang; Bing Hou; Guo Qing Yin; Mian Chen; Chao Li; Yan Jin; Fang Yuan

doi:10.4028/www.scientific.net/AMR.524-527.1610

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 524-527The Damage and Deformation Mechanism of Soft...

The Damage and Deformation Mechanism of Soft Mudstone in Drilling Engineer

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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Periodical:

Advanced Materials Research (Volumes 524-527)

Pages:

1610-1614

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.524-527.1610

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Online since:

May 2012

Authors:

Hui Zhang, Bing Hou, Guo Qing Yin, Mian Chen, Chao Li, Yan Jin, Fang Yuan

Keywords:

Damage, Deformation Mechanism, Drilling, Hydration Stress, Soft Mudstone

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