Low-permeability reservoir sample wettability characterization at multiple scales: Pore-, micro- and macro-contact angles
| Autor: | Chengyao Song, Viola I. Birss, Chris Debuhr, Amin Ghanizadeh, Bin Pan, Christopher R. Clarkson, Adnan Younis |
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| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
Materials science Analytical chemistry Energy Engineering and Power Technology Geotechnical Engineering and Engineering Geology Characterization (materials science) Contact angle Fuel Technology Hydrocarbon chemistry Low permeability Imbibition Wetting Environmental scanning electron microscope Droplet size |
| Zdroj: | Journal of Natural Gas Science and Engineering. 95:104229 |
| ISSN: | 1875-5100 |
| Popis: | Wettability, characterized by contact angle ( θ ), determines fluid distribution/migration in low-permeability (‘unconventional’) hydrocarbon reservoirs. However, θ is a scale-dependent parameter, i.e., pore- ( θ p o r e ), micro- ( θ m i c r o ) and macro- ( θ m a c r o ) contact angles can vary substantially. Therefore, herein, θ p o r e was estimated using a new theoretical model applied to nanoliter droplet imbibition dynamics. θ m i c r o was measured inside an environmental scanning electron microscope through sessile nanoliter droplets; θ m a c r o was quantified at ambient conditions through sessile microliter droplets. The effect of nanoliter droplet size on low-permeability rock wettability was also studied. Results demonstrate that: 1) θ p o r e > θ m i c r o > θ m a c r o ; 2) θ m i c r o reflects local wettability heterogeneity better than θ m a c r o ; 3) a larger droplet size causes a greater θ m i c r o for weakly water-wet low-permeability rocks, while there is no clear relationship between droplet size and θ m i c r o for strongly water-wet low-permeability rocks. Studies of this nature can be used to evaluate the controls on multi-phase flow in unconventional hydrocarbon reservoirs as applied to hydrocarbon extraction or greenhouse gas sequestration. |
| Databáze: | OpenAIRE |
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