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A method of determining adsorptive-gas permeability in shale cores with considering effect of dynamic adsorption on flow

机译：考虑动态吸附对流动的影响，测定页岩芯中的吸附 - 气体渗透性的方法

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摘要

Permeability is an essential parameter in characterizing gas storage and production in shale reservoirs. Most current transient methods for measuring shale permeability use helium instead of methane, which may lead to large errors due to the complexity of gas flow in nanopores of shale. Although some previous studies use methane as the test gas and consider the effect of gas adsorption on permeability measurement, very few studies consider the effect of gas dissolution on measurement. Gas dissolution in organic matter, such as kerogen, may lead to a dynamic adsorption process. This process can delay the gas adsorption equilibrium on kerogen. Investigations on the measurement of radial permeability are also very rare. In this study, a dynamic adsorption-diffusion (DAD) method is proposed to measure gas axial and radial permeability of shale. It presents a new insight into the critical effect of gas adsorption and dissolution on the measurement of permeability of shale. Radial and axial DAD models are based on designed radial and axial DAD experiments with a constant boundary pressure. The exact analytical solutions for these models are further derived to estimate the directional permeability of shale cores. The directional permeability measured by the DAD technique shows a distinct anisotropy for shale. The fitting results of DAD models show it can effectively determine the dominated gas transport in the experiments. The results of the commercial permeameter depict that gas permeability measured using helium can be over 50% larger than that measured using methane. It shows the importance of using methane in the gas permeability measurement of shale in practice.
机译：渗透性是在页岩储层中表征储气和生产的必要参数。大多数用于测量页岩渗透性的瞬态方法使用氦代替甲烷，这可能导致由于页岩的纳米孔中气流的复杂性导致大的误差。虽然一些先前的研究使用甲烷作为试验气体，但考虑气体吸附对渗透性测量的影响，很少有研究考虑气体溶解对测量的影响。有机物质（例如角膜原）的气体溶解可能导致动态吸附过程。该过程可以延迟在角蛋原上的气体吸附平衡。对径向渗透率测量的研究也非常罕见。在该研究中，提出了一种动态吸附 - 扩散（DAD）方法来测量页岩的气体轴向和径向渗透率。它介绍了对气体吸附和溶解对页岩渗透性的临界作用的新洞察。径向和轴向达牌型号基于设计的径向和轴向达达实验，具有恒定的边界压力。进一步推导出用于这些模型的确切分析解决方案以估计页岩芯的定向渗透率。通过爸爸技术测量的定向渗透性显示出页岩的不同各向异性。爸爸模型的拟合结果表明，它可以有效地确定实验中的主导的气体运输。商业渗透表的结果描绘了使用氦测量的助气渗透性比使用甲烷测量的液态渗透率超过50％。它显示了在实践中使用甲烷在耐气液渗透测量中的重要性。

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  • 来源
    《Fuel》 |2020年第may15期|117340.1-117340.17|共17页
  • 作者

    Yang Zehao; Bryant Steven; Dong Mingzhe;

  • 作者单位

    Univ Calgary Dept Chem & Petr Engn Calgary AB T2N 1N4 Canada|China Univ Petr Huadong Coll Petr Engn Qingdao Shandong Peoples R China;

    Univ Calgary Dept Chem & Petr Engn Calgary AB T2N 1N4 Canada;

    Univ Calgary Dept Chem & Petr Engn Calgary AB T2N 1N4 Canada|China Univ Petr Huadong Coll Petr Engn Qingdao Shandong Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Shale gas; Dynamic adsorption process; Directional gas permeability; Effect of gas dissolution;

    机译：页岩气;动态吸附过程;方向气体渗透性;气体溶解的影响;

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