Inorganic nanopores occurring in the shale matrix have strong hydrophilicity and irreducible water (IW) film can be formed on the inner surface of the pores making gas flow mechanisms in the pores more complex. In this paper, the existence of irreducible water (IW) in inorganic pores is considered, and, based on the Knudsen number (K (Formula presented.)) correction in shale pores, a shale gas apparent permeability model of inorganic nano-pores is established. The effect of the K (Formula presented.) correction on the apparent permeability, the ratio of flow with pore radius and the effect of IW on the apparent permeability are assessed. The main conclusions are as follows: (1) at low pressure (less than 10 MPa) and for medium pore size (pore radius range of 10 nm–60 nm), the effect of the K (Formula presented.) correction should be considered; (2) considering the effect of the K (Formula presented.) correction, bulk phase transport replaces surface diffusion more slowly; considering the existence of IW, bulk phase transport replaces surface diffusion more slowly; (3) with increase in pressure, the IW effect on gas apparent permeability decreases. Under low pressure, the IW, where pore size is small, promotes fluid flow, while the IW in the large pores hinders fluid flow. In conditions of ultra-high pressure, the IW promotes gas flow.
S. Zhao et al., "Study on Apparent Permeability Model for Gas Transport in Shale Inorganic Nanopores," Energies, vol. 15, no. 17, article no. 6301, MDPI, Sep 2022.
The definitive version is available at https://doi.org/10.3390/en15176301
Geosciences and Geological and Petroleum Engineering
Keywords and Phrases
apparent permeability; inorganic nanopore; irreducible water; Knudsen number correction; percolation mechanism; shale gas
International Standard Serial Number (ISSN)
Article - Journal
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01 Sep 2022
National Natural Science Foundation of China, Grant 51704265