Gekoppelte fluid-dynamische und poroelastische Effekte beim Gasfluss durch nanoporöse Medien: Experimente und skalenübergreifende Modellierung
Mineralogie, Petrologie und Geochemie
Physik des Erdkörpers
Physikalische Chemie von Molekülen, Flüssigkeiten und Grenzflächen, Biophysikalische Chemie
Strömungsmechanik
Theoretische Chemie: Moleküle, Materialien, Oberflächen
Zusammenfassung der Projektergebnisse
Fundamental aspects of gas transport in selected micro- and nanoporous materials (artificial and natural) were investigated jointly by experimental measurements and numerical modeling. Close co-operation of the partner institutes ensured feedback between experimentalists and modeler in terms of adjustment of experimental (starting and boundary) conditions, quality control, identification of first-order effects and dismissal of inadequate data or modeling concepts. • Within the range of Knudsen numbers covered by this study, complex 2nd and higher order fluiddynamic (slip-flow) models for gases were not required. In a geotechnical context, this finding can be instrumental in estimating fluid flow regimes and predicting production rates. • Permeability measurements with CO2 close to its critical point involve uncertainties related mainly to strong fluctuations in isothermal compressibility and, to a lesser extent, viscosity. The uncertainties may be reduced by improved experimental procedures (temperature control), but these improvements are not expected to be of much relevance for geotechnical applications. • Flow experiments with CO2 in this study were performed on dry samples, but since natural, geologic systems of interest always contain water, the adsorption of water and its effect on apparent and effective permeability requires further research. • Traditional/conventional fluid flow concepts should be reviewed and reassessed by direct and close co-operation of experimentalists and modeling specialists. The quality of literature data is often difficult to assess and misinterpretations may occur due to lack of communication between experimentalists and modelers. • A comprehensive experimental dataset could be established documenting an increase in apparent permeability at constant effective stress (Terzaghi definition) upon mechanical compression of a tight sandstone sample with significant clay content. This effect is attributed to widening (extension) of clay-coated transport pores in “pressure shadows”. • Two-phase flow experiments on a tight sandstone showed that the transport processes are controlled by viscous and slip flow up to a water saturation of 35-38%, whereas at water saturations >52% capillary-pressures affect the gas flow.
Projektbezogene Publikationen (Auswahl)
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(2019). Lattice Boltzmann model for upscaling in heterogeneous porous media based on Darcy’s law. Journal of Porous Media, 22: 1131-1139
Liu, G.Z., Liu, F.L., Li, M., Jin, X., Lv, W.F., Liu, Q., Wang, M.
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(2019, May 06–10). A semi-analytical interpretation model of pulse decay measurements on ultra-tight rocks. Interpore2019: 11th annual meeting, Valencia, Spain
Wang, Y., Nolte, S., Gaus, G., Amann-Hildenbrand, A., Krooss, B.M., Wang, M.
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(2019, May 06–10). Experimental gas permeability studies on synthetic microporous materials. Interpore2019: 11th annual meeting, Valencia, Spain
Nolte, S., Wang, Y., Fink, R., Krooss, B.M., Amann-Hildenbrand, A., Wang, M., Schmatz, J., Klaver, J.
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(2020). Compaction effects on permeability of spherical packing. Engineering Computations, Vol. 37 No. 9, pp. 3079-3096
Zhang, D., Tian, Z., Chen, Z., Wu, D., Zhou, G., Zhang, S. and Wang, M.
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(2020, August 31 – September 04). Flow of CO2 in “nanoporous” media near the critical point: Experimental challenges. Interpore2020: 12th annual meeting, Quingdao, China (online)
Nolte, S., Wang, Y., Fink, R., Krooss, B.M., Wang, M., Amann-Hildenbrand
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(2021). Transport configuration and tail dynamics of sphericalparticle motion through immiscible fluids interfaces. Chemical Engineering Science 229: 116091
Chen, Z.Q., Wang, M., Chen, S.Y.
