Neutron radiography study of water spontaneous imbibition in unsaturated sandstone

Yixin Zhao; Zhihu Li; Yang Wu; Yile Zhao; Bin Tang; Hang Li; Peng Li; Yu Song

doi:10.1117/12.2524647

10 May 2019 Neutron radiography study of water spontaneous imbibition in unsaturated sandstone

Yixin Zhao, Zhihu Li, Yang Wu, Yile Zhao, Bin Tang, Hang Li, Peng Li, Yu Song

Proceedings Volume 11068, Second Symposium on Novel Technology of X-Ray Imaging; 110681Z (2019) https://doi.org/10.1117/12.2524647
Event: Second Symposium on Novel Technology of X-Ray Imaging, 2018, Hefei, China

Abstract

The spontaneous imbibition of water in variable saturated porous media is a common phenomenon in various geotechnical applications. The relationship between the traveled distance of wetting front and imbibition time can be characterized by the sorptivity however, few researches have been carried out to investigate the sorptivity model in the spontaneous imbibition process. In this paper, based on the fractal dimension of pore mass and the formula of total flow rate of cross section of medium without considering gravity, a model was derived to calculate the sorptivity of sandstone. To validate the model, quantitative data on the imbibition of water in the matrix of unsaturated sandstone were obtained by neutron radiography a powerful imaging tool to research the dynamic water imbibition behaviour in rocks. The consequences display that there is the obvious linear relation between the traveled distance of wetting front and the square root of imbibition time in four monitoring lines and the linear coefficient is regarded as the experimental value of the sorptivity. Compared the mean of the experimental value, the theoretical value computed by the sorptivity model can reflect the experimental value to a large extent and, thus the sorptivity model can be applied to estimate the sorptivity of sandstone in the process of spontaneous imbibition.

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Yixin Zhao, Zhihu Li, Yang Wu, Yile Zhao, Bin Tang, Hang Li, Peng Li, and Yu Song "Neutron radiography study of water spontaneous imbibition in unsaturated sandstone", Proc. SPIE 11068, Second Symposium on Novel Technology of X-Ray Imaging, 110681Z (10 May 2019); https://doi.org/10.1117/12.2524647

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KEYWORDS

Radiography

Fractal analysis

Capillaries

Image processing

Mining

X-ray computed tomography

Data modeling

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