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首页> 外文期刊>Environmental Science & Technology >Experimental Evidence for Self-Limiting Reactive Flow through a Fractured Cement Core: Implications for Time-Dependent Wellbore Leakage
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Experimental Evidence for Self-Limiting Reactive Flow through a Fractured Cement Core: Implications for Time-Dependent Wellbore Leakage

机译：通过裂缝水泥芯的自限反应流的实验证据：随时间变化的井眼泄漏的含义

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摘要

We present a set of reactive transport experiments in cement fractures. The experiments simulate coupling between flow and reaction when acidic, CO_2-rich fluids flow along a leaky wellbore. An analog dilute acid with a pH between 2.0 and 3.15 was injected at constant rate between 0.3 and 9.4 cm/s into a fractured cement core. Pressure differential across the core and effluent pH were measured to track flow path evolution, which was analyzed with electron microscopy after injection. In many experiments reaction was restricted within relatively narrow, tortuous channels along the fracture surface. The observations are consistent with coupling between flow and dissolution/precipitation. Injected acid reacts along the fracture surface to leach calcium from cement phases. Ahead of the reaction front, high pH pore fluid mixes with calcium-rich water and induces mineral precipitation. Increases in the pressure differential for most experiments indicate that precipitation can be sufficient to restrict flow. Experimental data from this study combined with published field evidence for mineral precipitation along cemented annuli suggests that leakage of CO_2-rich fluids along a wellbore may seal the leakage pathway if the initial aperture is small and residence time allows mobilization and precipitation of minerals along the fracture.
机译：我们提出了一组水泥裂缝中的反应输运实验。实验模拟了酸性，富含CO_2的流体沿着泄漏的井筒流动时流动与反应之间的耦合。将pH在2.0到3.15之间的模拟稀酸以0.3到9.4 cm / s的恒定速率注入破碎的水泥芯中。测量了岩心两端的压差和废水的pH值，以跟踪流路的演变，并在注入后用电子显微镜对其进行分析。在许多实验中，反应被限制在沿裂缝表面相对狭窄的曲折通道内。观察结果与流动与溶解/沉淀之间的耦合一致。注入的酸沿着裂缝表面发生反应，从胶结相中浸出钙。在反应前沿之前，高pH的孔隙液与富含钙的水混合并引起矿物沉淀。在大多数实验中，压差的增加表明沉淀可能足以限制流量。该研究的实验数据与已发表的有关沿胶结环空的矿物沉淀的现场证据表明，如果初始孔径较小且停留时间允许沿裂缝动员和沉淀的矿物，那么沿井眼的富含CO_2流体的泄漏可能会封闭泄漏路径。 。

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  • 来源
    《Environmental Science & Technology》 |2013年第1期|269-275|共7页
  • 作者

    Nicolas J. Huerta; Marc A. Hesse; Steven L. Bryant; Brian R. Strazisar; Christina L. Lopano;

  • 作者单位

    Jackson School of Geosciences, The University of Texas at Austin, Austin, Texas 78712, United States,United States Department of Energy, National Energy Technology Laboratory, Pittsburgh, Pennsylvania 15236, United States;

    Jackson School of Geosciences, The University of Texas at Austin, Austin, Texas 78712, United States;

    Department of Petroleum and Geosystems Engineering, The University of Texas at Austin, Austin, Texas 78712, United States;

    United States Department of Energy, National Energy Technology Laboratory, Pittsburgh, Pennsylvania 15236, United States;

    United States Department of Energy, National Energy Technology Laboratory, Pittsburgh, Pennsylvania 15236, United States;

  • 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);
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  • 正文语种 eng
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