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Journal of Porous Media
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ISSN Druckformat: 1091-028X
ISSN Online: 1934-0508

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Journal of Porous Media

DOI: 10.1615/JPorMedia.2018028818
pages 1253-1263

PERMEABILITY AND DIFFUSION COEFFICIENT PREDICTION OF FRACTAL POROUS MEDIA WITH NANOSCALE PORES FOR GAS TRANSPORT

Ruifei Wang
College of Petroleum Engineering, Xi'an Shiyou University, Xi'an, China
Hongqing Song
College of Petroleum Engineering, Xi'an Shiyou University, Xi'an, China; School of Civil and Environmental Engineering, University of Science and Technology Beijing, China
Jiulong Wang
School of Civil and Environmental Engineering, University of Science and Technology Beijing, China
Yuhe Wang
Department of Petroleum Engineering, Texas A&M University, Qatar

ABSTRAKT

The gas mass transfer mechanism in nanoscale porous media, including convection and diffusion, is different from that of conventional scale porous media. It is highly difficult to predict the permeability and diffusion coefficients in porous media with nanoscale pores while utilizing theoretical methods. A Menger sponge fractal model for permeability and a gas diffusion coefficient calculation in the nanoscale porous media is established. The results of a CT (Computed Tomography) scan and experiments exhibit good agreement with the present model, which can characterize the pore structure accurately and facilitate the gas permeability and diffusion coefficient prediction of nanoscale porous media. The results indicate that the greater the fractal dimension, the worse the connectivity of the pores and the smaller the permeability of the nanoscale porous media. In addition, the average pore diameter has a strong impact on permeability for nanoscale porous media. The standard chart is completed under various conditions of average pore diameter and pressure to check gas transport mechanisms for convenience. This study has provided new insight and theoretical basis for reservoir exploitation with nanoscale pores, such as shale gas reservoirs.


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