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< Natural Gas and Oil > Editorial Department
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China Petroleum Engineering & Construction Corporation
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Overseas Research Center of Research Institute of Petroleum Exploration and Development
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Du Tonglin
Vice Editor in Chief:
Tang Xiaoyong,Pu Liming
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Issue:ISSN 1006-5539
          CN 51-1183/TE

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    Your Position ：Home->Past Journals Catalog->2013 Vol.2

    Analysis on Mechanism of Casing Failure Induced by Creep Deformation after High Pressure Water flooding and Its Precautions
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    Key Words：Mudstone creep； Casing damage； Cement mantle； circumferential load； Prevention and treatment
    Abstract： After high pressure water flooding in oilfield， absorbed mudstone begin to creep， which makes nonuniform ground stress act on cement mantle and casing. As a result， the cement mantle and casing string become deformed at radial direction. Established is the “casing-cement mantle-surrounding mudstone” creep mechanical model and conducted are quantitative calculation and analysis of creep load distribution and variation of mudstone. Analysis results show that radial and circumferential load distribution of outer wall of casing leads directly to casing deformation and damage and casing can change the stress boundary when it resists nonuniform load. Studied is the damage mechanism of casing and proposed are prevention measures of casing deformation and damage in high pressure water injection mudstone stratum， including prevention of water penetrating soft interbedded mudstone and strength improvement of the casing in mudstone stratum near oil layer， which will provide valuable reference for future prevention of casing damage.
     
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