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首页> 外文期刊>Applied Mathematical Modelling >Study on the effect of interface failure between casing and cement sheath on casing stress under non-uniform in-situ stress
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Study on the effect of interface failure between casing and cement sheath on casing stress under non-uniform in-situ stress

机译：壳体破坏在壳体鞘壳对原位应力下壳体应力下壳体断裂件的影响研究

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摘要

The interface failure (micro-annulus and de-bonding) at the first interface between cement sheath and formation, or at the second interface between cement sheath and casing can be easily caused by alternating change of internal pressure and temperature in the casing during large-scale multistage hydraulic fracturing in shale-gas well. It is likely to have a great impact on casing stress and pose a potential threat to casing failure, especially the casing under non-uniform in-situ stress (NUS). Hence, based on the generation mechanism of micro-annulus in the first and second interface, the mechanical model coupling the casing and cement sheath as well as formation under non-uniform in-situ stress is presented with due consideration of the effect of interface failure status on casing stress. In the model, the failure interface with micro-annulus is considered by adopting boundary conditions of smooth contact, and the interface without micro-annulus is considered by adopting boundary conditions of ideal complete contact. The stress and displacement equations are derived by the semi analytical method, and the linear algebra equations and analytical solution of the equations are obtained based on the different contact status. The associated calculating program to calculate stress distribution of casing and cement sheath is developed and programmed. The effects of physical parameter and geometrical parameters of formation, cement sheath and casing, contact status of cement sheath boundary and non-uniformity of in-situ stress on casing stress have been systematically investigated.
机译：在水泥护套和形成之间的第一界面处的界面故障（微环和去粘合），或者在水泥护套和壳体之间的第二界面处，可以通过在大型内部压力和壳体中的温度的变化和壳体中的变化来容易地引起秤在页岩气井中铺平多级水力压裂。它可能对套管应力产生很大影响，对套管失效构成潜在的威胁，尤其是在原位原位应力（NUS）下的壳体。因此，基于第一和第二界面中的微环的产生机制，提出了在界面故障的影响下，提出了耦合壳体和水泥护套的机械模型以及在不均匀的原位应力下的形成套管应力的状态。在该模型中，通过采用平滑接触的边界条件来考虑具有微环的故障接口，并且通过采用理想完全接触的边界条件考虑没有微环的界面。应力和位移方程由半分析方法导出，并且基于不同的接触状态获得线性代数方程和方程的分析解决方案。开发并编程了计算壳体和水泥护套应力分布的相关计算程序。系统地研究了物理参数和地理参数的影响，水泥护套和壳体的几何参数，水泥护套边界的接触状态以及原位应力对套管应力的原位应力的不均匀性。

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  • 来源
    《Applied Mathematical Modelling》 |2021年第3期|632-652|共21页
  • 作者

    Deng Kuanhai; Pengfei Xie; Yuan Yue; Zeng Dezhi; Li Qiong; Lin Yuanhua;

  • 作者单位

    State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University Chengdu Sichuan 610500 China Chongqin Xinyu Pressure Vessel Corp. Ltd Tongliang Chongqing 402560 China;

    State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University Chengdu Sichuan 610500 China;

    School of Materials Science and Engineering Southwest Petroleum University Chengdu Sichuan 610500 China;

    State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University Chengdu Sichuan 610500 China;

    Chongqin Xinyu Pressure Vessel Corp. Ltd Tongliang Chongqing 402560 China;

    State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University Chengdu Sichuan 610500 China Chongqin Xinyu Pressure Vessel Corp. Ltd Tongliang Chongqing 402560 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Interface failure; Cement sheath boundary; Contact status; Mechanical model; Casing stress; Non-uniform in-situ stress;

    机译：界面故障;水泥鞘边界;联系状态;机械模型;套管应力;不均匀的原位压力;

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