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首页> 外文期刊>Environmental Science & Technology >Meter-Scale Reactive Transport Modeling of CO_2-Rich Fluid Flow along Debonded Wellbore Casing-Cement Interfaces
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Meter-Scale Reactive Transport Modeling of CO_2-Rich Fluid Flow along Debonded Wellbore Casing-Cement Interfaces

机译：沿脱胶井筒套管-水泥界面的富含CO_2的流体流的米级反应输送建模

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摘要

Defects along wellbore interfaces constitute potential pathways for CO_(2) to leak from geological storage systems. In previous experimental work, we demonstrated that CO_(2)-induced reaction over length-scales of several meters can lead to self-sealing of such defects. In the present work, we develop a reactive transport model that, on the one hand, enables μm-mm scale exploration of reactions along debonding defects and, on the other hand, allows simulation of the large, 6 m-long samples used in our experiments. At these lengths, we find that interplay between flow velocity and reaction rate strongly affects opening/sealing of interfacial defects, and depth of chemical alteration. Carbonate precipitation in initially open defects decreases flow rate, leading to a transition from advection-dominated to diffusion-dominated reactive transport, with acidic conditions becoming progressively more confined upstream. We investigate how reaction kinetics, portlandite content, and the nature of the carbonate products impact the extent of cement alteration and permeability reduction. Notably, we observe that nonuniformity of the initial defect geometry has a profound effect on the self-sealing behavior and permeability evolution as observed on the meter scale. We infer that future wellbore models need to consider the effects of such aperture variations to obtain reliable upscaling relations.
机译：沿井眼界面的缺陷构成了CO_（2）从地质存储系统泄漏的潜在途径。在以前的实验工作中，我们证明了CO_（2）引起的几米长的反应可导致此类缺陷的自密封。在当前的工作中，我们开发了一种反应性传输模型，该模型一方面可以对沿着脱胶缺陷的反应进行微米级的探索，另一方面可以模拟用于我们的6m长的大型样品实验。在这些长度下，我们发现流速和反应速率之间的相互作用强烈影响界面缺陷的打开/密封以及化学变化的深度。最初开放的缺陷中的碳酸盐沉淀会降低流速，导致从对流为主向扩散为主的反应性迁移过渡，而酸性条件逐渐在上游受到限制。我们研究了反应动力学，硅酸盐含量和碳酸盐产品的性质如何影响水泥蚀变和渗透率降低的程度。值得注意的是，我们观察到，初始缺陷几何形状的不均匀性对自密封性能和渗透性演变产生了深远的影响，如在仪表刻度上观察到的那样。我们推断，未来的井眼模型需要考虑这种孔径变化的影响，以获得可靠的比例关系。

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  • 来源
    《Environmental Science & Technology》 |2018年第6期|3786-3795|共10页
  • 作者

    Timotheus K. T. Wolterbeek; Amir Raoof;

  • 作者单位

    Department of Earth Sciences, Utrecht University, Utrecht 3584 CD, The Netherlands;

    Department of Earth Sciences, Utrecht University, Utrecht 3584 CD, The Netherlands;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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