Evaluation and modeling of water vapor sorption and transport in nanoporous shale

Sang, Guijie; Liu, Shimin; Elsworth, Derek; Yang, Yun; Fan, Leilei

doi:10.1016/j.coal.2020.103553

Cited by 39 publications

(14 citation statements)

References 60 publications

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“…This agrees with the modeling results of Sang et al. (2020), who thought that surface flow of the adsorbed water contributes dominantly to the total flux of water in shales over a wide range of relative humidity (<96% RH ).…”

Section: Resultssupporting

confidence: 92%

“…Furthermore, since there is almost no free water when the water saturation is less than 20%, water transport is the movement of the adsorbed water phase at this stage. This agrees with the modeling results of Sang et al (2020), who thought that surface flow of the adsorbed water contributes dominantly to the total flux of water in shales over a wide range of relative humidity (<96% RH).…”

Section: Liquid and Vapor Transport Propertiessupporting

confidence: 92%

“…Another method to describe the flow of adsorbed water is assuming the adsorbed molecular layers sliding across the surface of the adsorbent, where the driving force is the gradient of hydrostatic stress intensity. According to this idea, Wu et al (2017) and Sang et al (2020) have done valuable work about water transport in the confined nanopores and shales. An alternative method is to extend Darcy's law for the transport of adsorbed water, as the film flow theory has adopted (Goyeneche et al, 2002;Yiotis et al, 2007).…”

Section: Transport Lawsmentioning

confidence: 99%

“…(2016) and Sang et al. (2020)'s pioneering work about fluid transport mechanism at the nanoscale in shales found that the surface flow of the adsorbed phase plays important role on total transport. Furthermore, water transport is dependent on water saturation of the samples, which adds a level of complexity to these processes.…”

Section: Introductionmentioning

confidence: 99%

“…Interpretation of water transport is challenging as water molecules can be simultaneously transported via multiphases in the pores of shales. Recently, Wu et al (2016) and Sang et al (2020)'s pioneering work about fluid transport mechanism at the nanoscale in shales found that the surface flow of the adsorbed phase plays important role on total transport. Furthermore, water transport is dependent on water saturation of the samples, which adds a level of complexity to these processes.…”

mentioning

confidence: 99%

See 4 more Smart Citations

Water Sorption and Transport in Shales: An Experimental and Simulation Study

Yang

Lyu

2021

Water Resources Research

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Understanding water uptake and drainage in shales has important implications for both hydrocarbon extraction and hydraulic fracturing fluid disposal. This study reports gravimetric water sorption isotherms and kinetics of water transport in shales. Moisture mass transport profiles during water uptake and drainage processes were numerically simulated. Quantitative parameters characterizing the water transport properties were calculated and their dependences on water saturation were analyzed. An approach was proposed to evaluate the permeability of shales using dynamic water sorption. The reliability of the estimated results was verified by the experimental values using gas permeability measurements.The apparent diffusion coefficients of water sorption on shales were found to be between 1.0 × 10−12 and 1.5 × 10−11 m2/s. The apparent diffusion coefficient first increases with water saturation and remains stable at a moderately saturated condition. However, this coefficient decreases for shales with high water saturation. Apparent diffusion coefficients for the sorption process are almost equal to those for the desorption process, except at the moderate saturation condition. Liquid water (including adsorbed water) contributes more than 80% to the water transport, whereas water vapor mainly contributes to shales with low water saturation. The liquid water permeability determined by water sorption is consistent with the crushed‐rock permeability measured by gas expansion. A further reasonable agreement is achieved between the analytical gas permeability, as a function of water saturation, and the experimental gas phase permeability. Water sorption kinetics provide an indirect method for assessing the water transport properties as a function of water saturation when direct measurements are not available.

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Section: Resultssupporting

confidence: 92%

Section: Liquid and Vapor Transport Propertiessupporting

confidence: 92%