A Method of Calculation of Apparent Gas Permeability for Tight Porous Media

• Published in: Transport in porous media Vol. 121; no. 2; pp. 407 - 417
• Main Author: Wang, Anlun
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 2018; Springer Nature B.V
• Subjects: Capillaries; Capillary flow; Civil Engineering; Classical and Continuum Physics; Earth and Environmental Science; Earth Sciences; Flow velocity; Gas flow; Geotechnical Engineering & Applied Earth Sciences; Hydrogeology; Hydrology/Water Resources; Industrial Chemistry/Chemical Engineering; Mathematical analysis; Media; Numerical integration; Permeability; Pore size; Pore size distribution; Porosity; Porous materials; Porous media; Shale gas; Tight porous media; Non-Darcy flow; Pore size distribution; Capillary bundle model; Apparent gas permeability
• ISSN: 0169-3913; 1573-1634
• DOI: 10.1007/s11242-017-0972-3

Tight and shale gas reservoirs are characterized by pores in the range of micro- and nanometer. The description of the gas flow in such tight porous media is complicated by the coexistence of various flow regimes. Generally, porous media is represented by a bundle of tortuous capillaries and contributions of various flow regimes are incorporated by numerical integration of the flow rate of individual capillary, which causes inconvenience for practical application. In this paper, approximate expressions for apparent gas permeability of tight porous media with a relative error less than 0.1 based on the lognormal pore size distribution and the fractal pore size distribution have been separately derived. With the proposed expressions, apparent gas permeability of tight porous media can be calculated without numerical integration. The proposed method has been validated by published data.