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首页> 外文会议>Geothermal Resources Council Annual Meeting Expo >Cement Mechanical Integrity for Geothermal Wells
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Cement Mechanical Integrity for Geothermal Wells

机译：地热井的水泥机械完整性

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Ensuring cement mechanical integrity of geothermal wells is of paramount importance for the operational and economic success of a project. Indeed, a failed cement sheath can lead to loss of production from inner-zonal fluid flow or well shut-in due to environmental or safety issues. In many cases, it is difficult to repair a failed cement sheath, and this may require an expensive work-over program, and subsequent re-completion of the well. In extreme cases, a failed cement sheath can result in loss of reservoirs due to early well abandonment.Over time, cement mechanical integrity (CMI) software applications have been proposed for the industry to design wells that do not leak during their entire life. However, the efficiency of such tools to solve CMI problems depends not only on if their equations are verified, but also if the models are validated versus the actual downhole conditions encountered by the wells to be simulated.In previous papers, the authors have shown the importance of simulating the cement hydration processes in order to evaluate the state of stress in the cement after the cement has set. They also have highlighted how cement plastic behavior can lead to the opening of a micro-annuli at the boundaries of a cement sheath. Recently they have started research work in the area of cement integrity of ultra-high temperature geothermal wells (up to 550°C) and how the effects of high well temperatures, either naturally occurring or induced, would affect the cement's mechanical integrity. This work focused on modeling the increase in pore pressures, the opening of micro-annuli at the cement sheath's boundaries, and the changes of cement phases which take place in the cement when it is heated to very high values. This paper will present all three topics to highlight that, when all these features are considered, it is feasible to design cement sheaths that do not fail, even at very high temperatures.
机译：确保地热井的水泥机械完整性对项目的运营和经济成功至关重要。实际上，由于环境或安全问题，失败的水泥护套可能导致从内部区域流体流动或良好的关闭产生的生产。在许多情况下，难以修复失败的水泥护套，这可能需要昂贵的工作程序，随后重新完成井。在极端情况下，由于早期放弃，失败的水泥护套可能导致储层损失。在时间，已经提出了水泥机械完整性（CMI）软件应用程序，为工业设计了在整个生命中没有泄漏的井。然而，解决CMI问题的这种工具的效率不仅取决于它们的方程，还取决于它们的方程式，而且如果验证模型与井上遇到的实际井下条件验证。在之前的论文中，作者已经表明了模拟水泥水合过程的重要性，以评价水泥设定后水泥中的应力状态。它们还突出了水泥塑料行为如何导致水泥护套边界的微载的开口。最近，他们已经开始在超高温热水井（最多550°C）的水泥完整性领域的研究工作以及如何影响天然存在或诱导的高良好温度的影响会影响水泥的机械​​完整性。这项工作侧重于模拟孔隙压力的增加，在水泥护套的边界处的微云的开口，以及当它被加热到非常高的值时在水泥中发生的水泥相的变化。本文将提出所有三个主题，以突出显示，当考虑所有这些特征时，即使在非常高的温度下，也可以设计不会失败的水泥护套是可行的。

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