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Mechanical behaviour of Longmaxi black shale saturated with different fluids: an experimental study

机译：用不同流体饱和龙颌黑页岩的力学行为：实验研究

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The fluid-shale interaction during carbon dioxide (CO2) enhanced shale gas recovery processes may have significant influences on the mechanical behaviour of shale, and it is also of great importance for the longterm safety of CO2 geological sequestration in shale formations. In this work, shale samples from the Longmaxi formation in the Sichuan basin were used to investigate the mechanical properties and the acoustic emission (AE) behaviour of shale upon saturation with different fluids (water, brine, and CO2-brine mixture with different CO2 phase states) at 45 degrees C. X-ray fluorescence (XRF) analysis results show that major element alterations occur after shale is treated with supercritical CO2-brine and subcritical CO2-brine, the element content of Ca, K and Al in supercritical CO2-brine saturated shale was decreased by 16.7%, 5.8% and 6.3%, respectively. Field emission scanning electron microscopy (FESEM) analysis results indicate that significant surface structural changes occur in shale after saturated with CO2 and brine. Furthermore, the uniaxial compressive strength (UCS) and elastic modulus (E) of shale with different fluid saturation were decreased. Supercritical CO2 cause a greater reduction of UCS and E compared to subcritical CO2 due to its higher adsorption capability and larger CO2 adsorption induced swelling. The maximum reduction in UCS and E of shale was observed in the case of CO2-brine saturated samples, and the influence of the CO2 phase on the mechanical behaviour of shale under brine conditions is not negligible. The fracture propagation pattern changes in shale after fluid saturation are also explained by the AE analysis.
机译：二氧化碳（CO2）增强的页岩气回收过程中的流体 - 页岩相互作用可能对页岩的力学行为产生显着影响，并且对于页岩形成中的CO2地质封存的Longterm安全性也非常重要。在这项工作中，来自四川盆地的龙曼氏形成的页岩样本用于研究饱和流体（水，盐水和二氧化碳混合物与不同CO 2相的饱和度时页岩的机械性能和声学发射（AE）行为状态为45℃。X射线荧光（XRF）分析结果表明，通过超临界CO2-盐水和亚临亚律CO2-盐水，CA，K和Al的亚临核CO2-盐水，Ca，K和Al的元素含量发生主要元件改变。盐水饱和页岩分别降低了16.7％，5.8％和6.3％。场发射扫描电子显微镜（FESEM）分析结果表明，在饱和CO 2和盐水后的页岩中发生显着的表面结构变化。此外，具有不同流体饱和的页岩的单轴抗压强度（UCS）和弹性模量（e）被降低。超临界CO 2由于其较高的吸附能力和较大的CO 2吸附诱导溶胀而导致亚临亚临亚临核CO2更低的UCS和E的减少。在CO 2-盐水饱和样品的情况下观察到页岩的UCS和E的最大降低，并且CO2相对盐水条件下页岩的力学行为的影响是不可忽略的。通过AE分析还解释了流体饱和度后的页岩的裂缝繁殖模式变化。

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  • 来源
    《RSC Advances》 |2017年第68期|共10页
  • 作者

    Zhang Shuwen; Xian Xuefu; Zhou Junping; Zhang Liang;

  • 作者单位

    Chongqing Univ State Key Lab Coal Mine Disaster Dynam &

    Control Chongqing 400030 Peoples R China;

    Chongqing Univ State Key Lab Coal Mine Disaster Dynam &

    Control Chongqing 400030 Peoples R China;

    Chongqing Univ State Key Lab Coal Mine Disaster Dynam &

    Control Chongqing 400030 Peoples R China;

    Chongqing Univ State Key Lab Coal Mine Disaster Dynam &

    Control Chongqing 400030 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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