岩土力学2024，Vol.45Issue(7)：1939-1956,18.DOI:10.16285/j.rsm.2023.1326
多孔介质低渗测试气体周期振荡法理论研究
Theoretical study of gas periodic oscillation method for low permeability testing in porous media
摘要
Abstract
The high-precision gas steady-state method and the gas pulse decay method are widely used in the permeability measurement of tight porous media.However there is a lack of in-depth discussion and analysis of the gas periodic oscillation method(POM).The basic principle of POM is introduced,and three practical methods for simulating periodic pressure waves are proposed.Additionally,an experimental equipment scheme is recommended,which includes two adjustable gas storage containers on each side of the specimen.The theory proposed by Fischer regarding the periodic oscillation method is expanded in this study to include the scenario where the seepage medium is a compressible fluid,as opposed to only considering incompressible fluids.This extension allows for a wider range of applications for the periodic oscillation method.Additionally,the study examines the physical significance of this method and analyzes the relationships between different parameters involved.Based on the generic theoretical solution of POM,two special cases are analyzed and the treatment of some complex sub-terms is optimized.The calculation results of the theoretical and numerical solutions of POM are compared through a series of orthogonal cases,and the effects of permeability,porosity,downstream container volume,specimen diameter and length on the experimental process are discussed respectively.The numerical solutions are used to verify the accuracies and stabilities of the theoretical solutions,and to illustrate some shortages of the theoretical solutions.Based on the case study,a better design strategy of POM experiment is given.关键词
气体周期振荡法/渗透率/储存系数/理论研究Key words
gas periodic oscillation method/permeability/storage coefficient/theoretical study分类
能源科技引用本文复制引用
王威,陈卫忠,杨典森,杨光华,周小文,袁明道,史永胜,刘宜杰..多孔介质低渗测试气体周期振荡法理论研究[J].岩土力学,2024,45(7):1939-1956,18.基金项目
国家自然科学基金(No.52108366) （No.52108366）
中国博士后科学基金(No.2020M672557) （No.2020M672557）
广东省水利科技创新项目(No.2022-04)This work was supported by the National Natural Science Foundation of China(52108366),the China Postdoctoral Science Foundation(2020M672557)and the Science and Technology Innovation Program from Water Resources of Guangdong Province(2022-04). （No.2022-04）
