Coupling of high Knudsen number and non-ideal gas effects in microporous media

Wang, Ziyan1,2; Wang, Moran1,2; Chen, Shiyi3,4

2018-04-10

10.1017/jfm.2018.46

JOURNAL OF FLUID MECHANICS   影响因子和分区

0022-1120

1469-7645

High Knudsen number non-ideal gas flows in porous media are important and fundamental in various applications including shale gas exploitation and carbon dioxide sequestration. Because of the small pore size in tight rocks, the Knudsen number (Kn) may be high (i.e. much higher than 0.01) even though the gas is really dense. In fact, due to the high pressure and temperature underground, the gas usually manifests a strong non-ideal gas effect. Understanding the coupling mechanism of the high Kn effect and non-ideal gas effect is a premise to accurately model deep-seated underground gas exploitation or carbon dioxide sequestration. In this work, we theoretically analyse the high Kn non-ideal gas flows in microporous media. Based on the relative importance of the non-ideal gas effect and high Kn effect, the coupling is divided into four types. The analysis is subsequently validated by multiscale numerical simulations, in which the four types of coupling are clearly demonstrated. After applying the analysis to laboratory measurements, we propose a characteristic pressure model to calculate the gas permeability of tight rocks with better precision. The new model incorporates the non-ideal gas effect with the high Kn effect accurately and better bridges the laboratory measurements with the reservoir engineering.

low-Reynolds-number flows porous media

SCI ; EI

英语

其他

National Science and Technology Major Project on Oil and Gas[2017ZX05013001]

Mechanics ; Physics

Mechanics ; Physics, Fluids & Plasmas

WOS:000424260500004

CAMBRIDGE UNIV PRESS

20180704779907

Bridges ; Carbon dioxide ; Flow of gases ; Gases ; High pressure effects ; Microporosity ; Pore size ; Porous materials ; Research laboratories ; Reynolds number ; Shale

Bridges:401.1 ; Fluid Flow, General:631.1 ; Gas Dynamics:631.1.2 ; Inorganic Compounds:804.2 ; Engineering Research:901.3 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Materials Science:951

ENGINEERING

Web of Science

1.Tsinghua Univ, Dept Engn Mech, Beijing 100084, Peoples R China
2.Tsinghua Univ, CNMM, Beijing 100084, Peoples R China
3.Peking Univ, State Lab Turbulence & Complex Syst, Beijing 100871, Peoples R China
4.Southern Univ Sci & Technol, Shenzhen 518055, Guangdong, Peoples R China

Wang, Ziyan,Wang, Moran,Chen, Shiyi. Coupling of high Knudsen number and non-ideal gas effects in microporous media[J]. JOURNAL OF FLUID MECHANICS,2018,840:56-73.

Wang, Ziyan,Wang, Moran,&Chen, Shiyi.(2018).Coupling of high Knudsen number and non-ideal gas effects in microporous media.JOURNAL OF FLUID MECHANICS,840,56-73.

Wang, Ziyan,et al."Coupling of high Knudsen number and non-ideal gas effects in microporous media".JOURNAL OF FLUID MECHANICS 840(2018):56-73.