Analysis on Strength Problem of Casing Caused by Cementing Lacuna

Yan Qiang Liu; Gui Jie Yu

doi:10.4028/www.scientific.net/AMR.403-408.2897

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 403-408Analysis on Strength Problem of Casing Caused by...

Analysis on Strength Problem of Casing Caused by Cementing Lacuna

Abstract:

By the thin shell theory, for the casing damage caused by formation creep at local ring cementing lacuna, differential equations for force and deformation of casing was established and the unknown boundary issues with rigid constraints around the cement sheath was discussed. The border issue and the displacement and stress solutions were determined by displacement method and semi-converse solution. The distribution of the stress was analyzed. The results show that risk locations of casing damage are mostly at the centre and the edge of the lacuna. The conditions of casing strength are established by the above.