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    Absolute adsorption of light hydrocarbons and carbon dioxide in shale rock and isolated kerogen

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    Type
    Article
    Authors
    Wu, Tianhao cc
    Zhao, Huangjing
    Tesson, Stéphane
    Firoozabadi, Abbas
    Date
    2018-08-28
    Online Publication Date
    2018-08-28
    Print Publication Date
    2019-01
    Permanent link to this record
    http://hdl.handle.net/10754/629803
    
    Metadata
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    Abstract
    Natural gas production from shale formations has changed the energy landscape. Knowledge of adsorption in the subsurface shale formations improves resource assessment. The excess adsorption is directly measurable from experiments. Evaluation of fluid content in shale is based on the absolute adsorption. At high pressure relevant to subsurface conditions, the computation of absolute adsorption from excess adsorption has shortcomings when the conventional models are used. In this work, we first present the excess sorption data of light hydrocarbons and carbon dioxide in subsurface shale rock and in isolated kerogen. Gravimetric method was used in our measurements. The results show that, at high pressure, the excess adsorption of ethane and carbon dioxide decreases significantly as pressure increases. Excess adsorption of ethane at 60 °C for the shale sample investigated becomes negative at high pressure. The conventional models may provide a non-monotonic absolute adsorption and even magnify the unphysical negative adsorption. In addition to the proposed model based on adsorbed layer volume, we also account for effective sample volume due to the pore volume accessibility by different molecules, as well as the swelling of kerogen. The adsorption data from subsurface shale and the method for analysis presented in this work set the stage for prediction capability in hydrocarbon production from shale reservoirs.
    Citation
    Wu T, Zhao H, Tesson S, Firoozabadi A (2019) Absolute adsorption of light hydrocarbons and carbon dioxide in shale rock and isolated kerogen. Fuel 235: 855–867. Available: http://dx.doi.org/10.1016/j.fuel.2018.08.023.
    Sponsors
    The work was supported by Saudi Aramco [Project code: RGC/3/2053-01-01] at the King Abdullah Science and Technology University (KAUST), Saudi Arabia. Their support is appreciated. We also thank Dr. Ali Dogru of Aramco for technical discussions on the research work.
    Publisher
    Elsevier BV
    Journal
    Fuel
    DOI
    10.1016/j.fuel.2018.08.023
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.fuel.2018.08.023
    Scopus Count
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