Research on data inversion process of gas pressure-oscillation method for low permeability testing in porous media

IF 2.5 4区工程技术 Q2 ENGINEERING, MECHANICAL

Journal of Porous Media Pub Date : 2024-07-01 DOI:10.1615/jpormedia.2024052329

Wei Wang, Diansen Yang, Xing Wang, Yijie Liu, Zecheng Chi

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引用次数: 0

Abstract

The pressure-oscillation method is a relatively new experimental approach for evaluating the seepage characteristics of porous media. It allows for simultaneous measurement of permeability and porosity, while offering several advantages, including flexibility, automation, and data re-peatability. However, there has been limited research on the data inversion process using this method. In this study, a data inversion process is proposed based on the theoretical solution proposed by Fischer (1992). The reliability and accuracy of the method are verified through synthetic signals and computation cases. The data inversion process involves two steps: processing the gas pres-sure data using fast Fourier transform and local extreme value locate to obtain the amplitude ratio and phase delay, and calcu-lating intermediate parameters that relate to gas apparent permeability and effective porosity using graphical and numerical root-finding algorithm. The calculation process is simplified by not calculating one complex intermediate parameter. The data inversion process is demonstrated using 11 computation cases, showing its intuitive nature, fast computation, deterministic results, and high accuracy. The impact of various factors on the gas pressure variations of downstream reservoir is analyzed through case analysis. This study can serve as a valuable reference for de-signing experiments using the gas pressure-oscillation method.

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用于多孔介质低渗透性测试的气体压力-振荡法数据反演过程研究

压力振荡法是评估多孔介质渗流特性的一种相对较新的实验方法。它可以同时测量渗透率和孔隙度，同时具有灵活性、自动化和数据可重复性等优点。然而，使用这种方法对数据反演过程的研究还很有限。本研究根据 Fischer（1992 年）提出的理论解决方案，提出了一种数据反演过程。通过合成信号和计算案例验证了该方法的可靠性和准确性。数据反演过程包括两个步骤：利用快速傅里叶变换和局部极值定位对气体压强数据进行处理，得到振幅比和相位延迟；利用图形和数值寻根算法计算与气体表观渗透率和有效孔隙度相关的中间参数。由于不计算一个复杂的中间参数，因此简化了计算过程。利用 11 个计算案例演示了数据反演过程，显示了其直观性、快速计算、结果确定性和高精度。通过案例分析，分析了各种因素对下游储层气体压力变化的影响。本研究可为使用气体压力-振荡法进行去设计实验提供有价值的参考。

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.