Subsurface multiphase reactive flow in geologic CO2 storage: Key impact factors and characterization approaches
نویسندگان
چکیده
Multiple measurements and data sets show unequivocally that levels of carbon dioxide (CO2) have been increasing in the Earth's atmosphere for past several centuries, with rate becoming steeper recent decades (Soeder, 2021). Carbon capture, utilization storage (CCUS) has regarded as an effective approach to swiftly cut CO2 emissions. Among existing CCUS technologies, geological highest technological maturity, is most vital “sink” consume captured CO2. For storage, large amounts need be injected into deep subsurface, flow subsurface a very complicated process. The system two-phase or even three-phase system, pores needs clearly distinguished from fractures wellbores. Most importantly, wettability, pore structure, geochemical reactions play important roles governing flow. Without clear understanding how impact factors affect flow, it difficult predict impairs confidence policy makers investors support large-scale geologic storage. To study there develop approaches characterize system. This work discusses key strong on characterization. Impact wettability structure multiphase injection formations displaces brine spaces, resulting various CO2-brine displacement patterns, such capillary fingering, viscous crossover, compact displacement. These patterns also occur later flows back displace supercritical when stops. results trapped droplets ganglia referred residual trapping trapping. Wettability significant effects represents affinity fluid solid surface. By changing force governed by Young-Laplace law, modifies local porefilling events thus impacts patterns. Increasing invading drainage imbibition stabilizes front due cooperative pore-filling at scale (Holtzman Segre, 2015). However, pattern will change extensively result corner strongly wetting surface (Hu et al., 2018). On other hand, role may depend type permeable media. pore-scale disorder, which randomness size, changes threshold pressure affects paths. disorder promotes unstable both conditions (Toussaint 2005), but under certain conditions, higher enhance smooth front. roughness variations aperture between two rough surfaces determines path controls fractured medium. Therefore, transition open challenge active area research. Geochemical determining Though reaction-induced mineral can only become after hundreds thousands years reservoir scale, fast dissolution precipitation micro-scale channels host rocks caprocks permeability influence migration behaviour (Zhang 2019). carbonate rocks, usually causes opening carbonates, enhances injectivity beneficial largescale (Yang 2020). A sandstone contains feldspars glauconite CO2-sandstone interaction, sealing secondary minerals (Xu 2004). given different types varying reaction environments, precisely if channel rock close reactions. research direction future find out criterion determine reactions, consideration environments. Pore-scale modeling reactive Compared continuum-scale models, modeling, directly reflects realistic porous structures, provides powerful tool studying species transport, chemical dissolution/precipitation processes (Chen 2022). Effects pressure, temperature, properties, size morphology CO2-water distributions studied modeling. reveals mechanisms nonequilibrium surrounding enhancing solubility Recently, depleted oil drawn attention, CO2-oil-water are extremely (Zhu ideal heterogeneity, composition kinetics processes. Further investigate twophase helpful better saline reservoirs. Acknowledgement was performed Key R&D Program Inner Mongolia Province China (No. 2021ZD0034-3) National Natural Science Foundation (Nos. 42172315, 42141011 52122905). Cited as: Zhang, L., Chen, Hu, R., Cai, J. Subsurface storage: characterization approaches. Advances Geo-Energy Research, 2022, 6(3): 179-180. https://doi.org/10.46690/ager.2022.03.01
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ژورنال
عنوان ژورنال: Advances in geo-energy research
سال: 2022
ISSN: ['2207-9963', '2208-598X']
DOI: https://doi.org/10.46690/ager.2022.03.01