Water Vapor Sorption Properties of Illinois Shales Under Dynamic Water Vapor Conditions: Experimentation and Modeling

Sang, Guijie; Liu, Shimin; Elsworth, Derek

doi:10.1029/2019wr024992

Cited by 77 publications

(56 citation statements)

References 95 publications

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“…Organic matter in shale contains many nano-pores, and the organic carbon content affects the water adsorption in shale reservoir rocks. The result is in accordance with the previous studies that the organic kerogen favors the adsorption capacity 13,46 . Compared with these shale samples, the shale samples with full bedding are the higher adsorption than those with less bedding, and the shale bedding will impact on shale reservoir properties and drilling optimization 44 .…”

Section: Effect Of Shale Properties On Water Vapor Adsorptionsupporting

confidence: 93%

Experimental investigation on water adsorption and desorption isotherms of the Longmaxi shale in the Sichuan Basin, China

Shen

et al. 2020

Sci Rep

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the understanding of water adsorption and desorption behavior in the shale rocks is of great significance in the reserve estimation, wellbore stability and hydrocarbon extraction in the shale gas reservoirs. However, the water sorption behavior in the shales remains unclear. In this study, water vapor adsorption/desorption isotherms of the Longmaxi shale in the Sichuan Basin, china were conducted at various temperatures (30 °C, 60 °C) and a relative pressure up to 0.97 to understand the water sorption behavior. Then the effects of temperature and shale properties were analyzed, and the water adsorption, hysteresis, saturation and capillary pressure were discussed. The results indicate that water adsorption isotherms of the Longmaxi shale exhibit the type II characteristics. The water molecules initially adsorb on the shale particle/pore surfaces at low relative pressure while the capillary condensation dominates at high relative pressure. Temperature favors the water sorption in the shales at high relative pressure, and the GAB isotherm model is found to be suitable for describe the water adsorption/desorption behavior. The high organic carbon and full bedding are beneficial to water adsorption in the shales while the calcite inhibits the behavior. There exists the hysteresis between water adsorption and desorption at the whole relative pressure, which suggests that the depletion of condensed water from smaller capillary pores is more difficult than that from larger pores, and the chemical interaction contributes to the hysteresis loop for water sorption. The capillary pressure in the shales can be up to the order of several hundreds of Mpa, and thus the desorption of water from the shales may not be as easy as the water adsorption due to the high capillary pressure, which results in water retention behavior in the shale gas reservoirs. these results can provide insights into a better understanding of water sorption behavior in the shale so as to optimize extraction conditions and predict gas productivity in the shale gas reservoirs.

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Section: Effect Of Shale Properties On Water Vapor Adsorptionsupporting

confidence: 93%

Experimental investigation on water adsorption and desorption isotherms of the Longmaxi shale in the Sichuan Basin, China

Shen

et al. 2020

Sci Rep

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“… Water distribution in shale pores at (adapted from Sang 97 and Yang 98 ) (a) low water content, (b) intermediate water content, and (c) high water content. Adapted with permission from [Sang, G.; Liu, S.; Elsworth, D. Water vapor sorption properties of illinois shales under dynamic water vapor conditions: Experimentation and modeling.…”

Section: Resultsmentioning

confidence: 99%

Synergetic Effect of Water, Temperature, and Pressure on Methane Adsorption in Shale Gas Reservoirs

Han

Memon

et al. 2021

ACS Omega

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Adsorption is one of the most important forms of storage of gas in shale reservoirs. Shale gas adsorption in the actual reservoir is not only affected by individual factors such as water content, temperature, and pressure but also by the synergetic effect of these factors. In this study, we conducted laboratory experiments on methane adsorption in dry and wet shale at different pressures and temperatures. The synergetic effect of water content, temperature, and pressure on shale gas adsorption is explored. The results show that increasing temperature weakens the interaction between methane and shale and reduces adsorption capacity due to the exothermic nature of adsorption. Water reduces methane adsorption capacity by occupying adsorption sites and blocking pores in the shale system. Although temperature and water reduce methane adsorption individually, the effect of these two factors weakens each other. Temperature has a more significant effect on methane adsorption in shales with low water content, while water has a more remarkable impact on methane adsorption at a low temperature. Furthermore, the increase in pressure reduces the negative influence of water and temperature on methane adsorption. By quantitatively analyzing the relationship between methane adsorption in dry and wet shales, a predictive adsorption model for wet shale considering the influence of in situ conditions is proposed and validated. Validation shows that the proposed model has high accuracy and broad applicability to shales with different properties.

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“…The BET theory was also applied to water sorption data to obtain an alternate estimate of specific surface area. The linearization of the experimental water sorption data yields obviously lower BET specific surface area values: 22.2 (U. Ordovician shale) and 6.7 m 2 /g (L. Silurian shale), which is probably related to the low cation exchange capacity in these shales (Sang et al., 2019; Seemann et al., 2017). The inconsistencies in these values of different methods reflect the sorption mechanisms of geological materials are sorptive dependent (Bertier et al., 2016; Seemann et al., 2017; Tokunaga et al., 2017).…”

Section: Resultsmentioning

confidence: 99%

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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Water Vapor Sorption Properties of Illinois Shales Under Dynamic Water Vapor Conditions: Experimentation and Modeling

Cited by 77 publications

References 95 publications

Experimental investigation on water adsorption and desorption isotherms of the Longmaxi shale in the Sichuan Basin, China

Experimental investigation on water adsorption and desorption isotherms of the Longmaxi shale in the Sichuan Basin, China

Synergetic Effect of Water, Temperature, and Pressure on Methane Adsorption in Shale Gas Reservoirs

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

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