Multiscale study of CO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e1081" altimg="si87.svg"><mml:msub><mml:mrow/><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:math> impact on fluid transport and carbonate dissolution in Utica and Eagle Ford shale

Elkady, Youssef; Kovscek, Anthony R.

doi:10.1016/j.petrol.2020.107867

Cited by 18 publications

(2 citation statements)

References 23 publications

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“…The aluminum body allows for sufficient CT transparency to image the in situ rock and saturating gas. Core preparations for drying and sleeving are identical to the procedure detailed by Elkady and Kovscek (2020) [24].…”

Section: Sample Preparationmentioning

confidence: 99%

“…CT combined with X-ray attenuating penetrants, such as krypton (Kr), has been used in applications related to porosity, diffusion, adsorption, and enhanced recovery quantification [15][16][17][18][19][20][21]. CT shale applications also include measuring fracture apertures [22,23] and visualizing mineral dissolution [24], among many others. However, little work is found in the literature seeking to validate CT-derived results with storativity or porosity results computed via mass-balance techniques.…”

Section: Introductionmentioning

confidence: 99%

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Three-Dimensional Imaging and Quantification of Gas Storativity in Nanoporous Media via X-rays Computed Tomography

et al. 2020

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This study provides the engineering science underpinnings for improved characterization and quantification of the interplay of gases with kerogen and minerals in shale. Natural nanoporous media such as shale (i.e., mudstone) often present with low permeability and dual porosity, making them difficult to characterize given the complex structural and chemical features across multiple scales. These structures give nanoporous solids a large surface area for gas to sorb. In oil and gas applications, full understanding of these media and their sorption characteristics are critical for evaluating gas reserves, flow, and storage for enhanced recovery and CO2 sequestration potential. Other applications include CO2 capture from industrial plants, hydrogen storage on sorbent surfaces, and heterogeneous catalysis in ammonia synthesis. Therefore, high-resolution experimental procedures are demanded to better understand the gas–solid behavior. In this study, CT imaging was applied on the sub-millimeter scale to shale samples (Eagle Ford and Wolfcamp) to improve quantitative agreement between CT-derived and pulse decay (mass balance) derived results. Improved CT imaging formulations are presented that better match mass balance results, highlighting the significance of gas sorption in complex nanoporous media. The proposed CT routine implemented on the Eagle Ford sample demonstrated a 17% error reduction (22% to 5%) when compared to the conventional CT procedure. These observations are consistent in the Wolfcamp sample, emphasizing the reliability of this technique for broader implementation of digital adsorption studies in nanoporous geomaterials.

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Section: Sample Preparationmentioning

confidence: 99%