Gas Transport Mechanism in Tight Porous Media

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  • (1.College of Earth Science and Technology,China University of Petroleum,Qingdao 266580,China
    2.Geochemistry Institute of Guangzhou,Chinese Academy of Sciences,Guangzhou 510640,China)

Received date: 2013-12-24

  Revised date: 2014-03-24

  Online published: 2014-10-10

Abstract

Gas transport mechanism in tight porous media is influenced by many factors,such as the pore structure and gas occurrence form,temperature and pressure,etc.In addition,the shale,coal,tight sandstone are enriched in nanopores,which makes the gas transport mechanism very complex.This study investigated the migration mechanism of gases in density of porous medium,and introduced the dense gas that is under great formation pressure and has high gas density.By calculating the molecular average free path,it is found that free path Fick diffusion and surface diffusion may be the main ways of gas when the pressure is greater than 1.135MPa(76.85℃).The Knudsen correction factors of permeability decreased with increasing pressure increased,or with increasing pore radius,but increased with increasing temperature.Gas spreads from pore to hole and fracture system is a result of various diffusion.Pore size and gas occurrence mechanism directly affect gas diffusion mechanism.Knudsen permeability model is a more accurate permeability model though the comparison between Klinkenberg and Knudsen permeability correction factor,and Klinkenberg permeability correction factor can be regarded as the Knudsen permeability correction factor's first-order correction.
 

Cite this article

LIU Sheng-xin,ZHONG Jian-hua,LIU Xiao-guang,LI Yong,SHAO Zhu-fu,LIU Xuan . Gas Transport Mechanism in Tight Porous Media[J]. Natural Gas Geoscience, 2014 , 25(10) : 1520 -1528 . DOI: 10.11764/j.issn.1672-1926.2014.10.1520

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