Study on Adsorption-desorption Characteristics and Mechanism of Gaseous Water in Shale

IF 2.5 4区工程技术 Q2 ENGINEERING, MECHANICAL

Journal of Porous Media Pub Date : 2024-04-01 DOI:10.1615/jpormedia.2024052071

Na Zhang, Shuaidong Wang, Xinyue Wang, Hao Wang, Can Huang, Zheng Li

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Abstract

Studying the behavior of gaseous water adsorption and desorption in shale has significant theoretical and practical importance for exploring the micro-scale distribution of water and gas in shale reservoirs and deepening our insight of the mechanisms behind shale gas accumulation. Under 20-40°C conditions, isotherms and kinetic curves of gaseous water adsorption-desorption were tested in shale samples with a particle size of 60-80 mesh. Furthermore, the hysteresis behavior of gaseous water adsorption-desorption in shale was analyzed. Three different isotherm models and four adsorption kinetic models were used to explain how gaseous water adsorbed in shale. The results indicate that the Dent and bi-Langmuir kinetic models were the most suitable models for isotherm adsorption and adsorption kinetics, respectively. This suggests that the adsorption of gaseous water in shale follows a physical adsorption process from monolayer adsorption to multilayer adsorption and then to capillary condensation. Furthermore, this process is a first-order, two-stage kinetic process controlled by internal pore diffusion. The uncompleted adsorption-desorption hysteresis behavior is chiefly attributed to the difficulty of clay-bound water and cation-bound water to release at the experimental temperature. In addition, this study analyzed thermodynamic parameters, including ΔG, ΔH, and ΔS, and found that the adsorption behavior of gaseous water in shale is a spontaneous, exothermic process with a decrease in entropy. The study's conclusions serve as a foundation for reference for realizing the distribution patterns of gas and water in the Nimrat Shale, as well as the flow behavior of shale ga

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页岩中气态水的吸附-解吸特性与机理研究

研究页岩中气态水的吸附和解吸行为，对于探索页岩储层中水和气的微尺度分布、加深对页岩气聚集机理的认识具有重要的理论和实践意义。在 20-40°C 条件下，测试了粒度为 60-80 目页岩样品中气态水吸附-解吸的等温线和动力学曲线。此外，还分析了页岩中气体水吸附-解吸的滞后行为。使用了三种不同的等温线模型和四种吸附动力学模型来解释气态水在页岩中的吸附情况。结果表明，Dent 和 bi-Langmuir 动力学模型分别是最适合的等温吸附模型和吸附动力学模型。这表明气态水在页岩中的吸附过程是一个从单层吸附到多层吸附，再到毛细管凝聚的物理吸附过程。此外，这一过程是由内部孔隙扩散控制的一阶两级动力学过程。未完成的吸附-解吸滞后行为主要归因于粘土结合水和阳离子结合水在实验温度下难以释放。此外，该研究还分析了热力学参数，包括 ΔG、ΔH 和 ΔS，发现页岩中气态水的吸附行为是一个自发的放热过程，且熵值下降。研究结论为了解尼姆拉特页岩中气体和水的分布模式以及页岩的流动行为提供了参考依据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Porous Media 工程技术-工程：机械

CiteScore

3.50

自引率

8.70%

发文量

审稿时长

12.5 months

期刊介绍： The Journal of Porous Media publishes original full-length research articles (and technical notes) in a wide variety of areas related to porous media studies, such as mathematical modeling, numerical and experimental techniques, industrial and environmental heat and mass transfer, conduction, convection, radiation, particle transport and capillary effects, reactive flows, deformable porous media, biomedical applications, and mechanics of the porous substrate. Emphasis will be given to manuscripts that present novel findings pertinent to these areas. The journal will also consider publication of state-of-the-art reviews. Manuscripts applying known methods to previously solved problems or providing results in the absence of scientific motivation or application will not be accepted. Submitted articles should contribute to the understanding of specific scientific problems or to solution techniques that are useful in applications. Papers that link theory with computational practice to provide insight into the processes are welcome.