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The Estimation to the Service Life of Casing in Salt Formation

机译：盐层中套管寿命的估算

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摘要

The casing failure is serious in Zhongyuan oil field，This case happened frequentlyrnin the salt formation of the Tertiary shahejie group. And the casing deformation is thernmain form of failure. Research reveal that the main cause of casing failure is that thernexternal load acting on casing due to salt formation creep under the nonhomogeneousrnin-situ stresses exceeding the collapsing strength of the casing. The key to avoidrncasing failure is the proper casing grade.rnThe salt formation is regarded as Maxwell model, and a viscous elastic mechanicalrnmodel for plane strain features is established. based on the experimental results ofrntriaxial multilevel loadings for the salt rock creep, the creep constitutive model andrncreep parameters is given，Combined with geologic condition of the Tertiary saltrnformation in Zhongyuan Oilfield, with the analysis and calculation of the externalrnload acted on casing due to salt formation creep under the nonhomogeneous in-siturnstresses by finite element method，the variation laws of the external load arernachieved. The relationship of the external load and the collapsing is close. Establishrnthe predicting model of casing service life. Considering the affect of corrosion,rnestimated the casing service life in salt formation and get the exact result which canrnguide the casing string design in this oil field.
机译：中原油田套管严重破坏，该事件在第三系沙河街组成盐中频繁发生。套管变形是破坏的主要形式。研究表明，套管破坏的主要原因是在非均质原位应力作用下盐形成蠕变所引起的外部载荷作用于套管上，超过套管的坍塌强度。避免套管破坏的关键是适当的套管等级。盐的形成被认为是麦克斯韦模型，建立了平面应变特征的粘弹性力学模型。根据盐岩蠕变的三轴多级荷载试验结果，给出了蠕变本构模型和蠕变参数，并结合中原油田第三系盐分地质条件，对盐分作用在套管上的外部荷载进行了分析计算。利用有限元方法对非均质内应力作用下的蠕变进行了求解，得出了外力的变化规律。外部载荷与塌陷的关系是紧密的。建立套管使用寿命的预测模型。考虑到腐蚀的影响，重新确定了成盐套管的使用寿命，并获得了可以指导该油田套管柱设计的准确结果。

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  • 来源
  • 会议地点 Shanghai(CN);Shanghai(CN)
  • 作者

    Zhonghui Li; Yishan Lou; Liang Zhu; Zheng Tian; Yunchuan Lei;

  • 作者单位

    (434023) No.1 Nanhuan road, Jingzhou city, Hubei province. Tel: 86+716-8060736. E-mail:rnlouys@yangtzeu.edu.cn, lizhonghui2550@126.com;

    rnDepartment of Petroleum Engineering, Yangtze University. No.1rnNanhuan road, Jingzhou city, Hubei province, E-mail: Louys2006@126.com;

    rnDepartment of Petroleum Engineering, Yangtze University. No.1rnNanhuan road, jingzhou city, Hubei province, E-mail: alloyer007@126.com;

    rnDepartment of Petroleum Engineering, Yangtze University. No.1rnNanhuan road, Jingzhou city, Hubei province;

    rnDepartment of Petroleum Engineering, Yangtze University. No.1rnNanhuan road, Jingzhou city, Hubei province;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 管道运输;
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