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首页> 外文会议>ISRM 2011;ISRM international congress on rock mechanics >Investigation of thermal effect on stability of deep wellbores in low and high permeable formations
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Investigation of thermal effect on stability of deep wellbores in low and high permeable formations

机译：高低渗透率地层深井筒稳定性的热效应研究

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Wellbore instability is one of the main problems during drilling in rocks. This problem might cause serious complications in wells and in some cases it can lead to expensive operational problems. Drilling fluid (mud) is utilized to maintain the borehole stability during drilling, because it produces an opposite pressure to stabilize the borehole.Asuitable mud density range (mud window) should be determined considering the material properties, stress distributions around the borehole etc. During deep drilling processes thermal effects are significant for the borehole stability, because they change the stress distribution near the borehole in formof thermal stress, i.e. expansion by heating or shrinkage during cooling in the near-field of a wellbore. In this paper, thermal effects were studied in low and high permeable formations (under conduction and conductionadvection). Temperature change under conduction or advection condition can be calculated, among others, by using the finite difference method. With known temperature distributions the thermal stress is calculated by using numeric integration. To simulate the temperature and thermal stress distributions, the program “Real-Time Optimization of the Mud Window” was developed by using program language C#. The developed program was also verified with FDM code FLAC3D. The two results match very well to each other. Thermal stresses were calculated in formations with different permeability under conduction und conduction-advection conditions. It is found that the thermal stress distribution in the conduction-advection process does not differ from it in the conduction process in case of a very low permeability (e.g. 10.20 m2), while the advection process dominates in case of a relatively high permeability (e.g. >10.15 m2). At the end, the thermal effect on wellbore stability is analyzed considering the calculation of minimum mud pressure.
机译：井筒失稳是岩石钻探过程中的主要问题之一。该问题可能会导致井中的严重并发症，并且在某些情况下可能导致昂贵的操作问题。钻井液（泥浆）用于维持钻井过程中的井眼稳定性，因为它会产生相反的压力来稳定井筒。应根据材料特性，井眼周围的应力分布等确定合适的泥浆密度范围（泥浆窗口）。深井钻探过程的热效应对于井眼稳定性非常重要，因为它们会以热应力的形式改变井眼附近的应力分布，即在井眼近场中冷却时因加热或收缩而膨胀。本文研究了低渗透率和高渗透率地层（在传导和传导平流作用下）的热效应。可以使用有限差分法等计算出传导或对流条件下的温度变化。对于已知的温度分布，通过使用数值积分来计算热应力。为了模拟温度和热应力分布，使用程序语言C＃开发了“泥浆窗口的实时优化”程序。所开发的程序也已通过FDM代码FLAC3D验证。这两个结果彼此非常匹配。计算了在传导和传导平流条件下具有不同渗透率的地层中的热应力。发现在传导-对流过程中的热应力分布在传导率非常低（例如10.20 m2）的情况下与传导过程中的热应力分布没有区别，而在传导率相对较高的情况（例如，10.20 m2）中对流过程占主导> 10.15平方米）。最后，结合最小泥浆压力的计算，分析了热对井筒稳定性的影响。

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