Pore-Scale Displacement Experiments Using Microfluidic Device to Investigate Fingering Mechanisms Using Both CO2 and N2: Implications for EOR and CO2 Geo-Storage
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引用次数: 0
Abstract
For water-wet porous media, the literature revealed a poor displacement efficiency for CO2 relative to N2. The overall average residual water saturation displaced by CO2 is ~50.0% compared to ~20.0% displaced by N2. Furthermore, based on the “Land” trapping model (Land, 1968), the non-wetting phase trapped during a subsequent imbibition displacement would also be reduced due to the low end-point saturation of the non-wetting phase achieved during the drainage flood. In this study, we hypothesize that for a drainage flood with a very low viscosity ratio (μdisplacing/μdisplaced <<1) and low flow rate (ca < 10–6) (i.e., conditions that are typical for the displacement of water by CO2, N2 in a strongly water-wet porous media) the end-point residual water saturation is predominantly controlled by the interfacial tension of the fluid-gas system. To test our hypothesis, we have performed six pore-scale displacement experiments on a micromodel using both CO2 and N2 to understand the influence of different fingering mechanisms (i.e., capillary vs. viscous) on flooding performance. It is observed that, for capillary-dominated floods, IFT values control the displacement efficiency. Therefore, we could conclude for capillary experiments that the poor displacement of the non-wetting (i.e., CO2) is due to a snap-off model which is closely related to the IFT value.
期刊介绍:
Petroleum Chemistry (Neftekhimiya), founded in 1961, offers original papers on and reviews of theoretical and experimental studies concerned with current problems of petroleum chemistry and processing such as chemical composition of crude oils and natural gas liquids; petroleum refining (cracking, hydrocracking, and catalytic reforming); catalysts for petrochemical processes (hydrogenation, isomerization, oxidation, hydroformylation, etc.); activation and catalytic transformation of hydrocarbons and other components of petroleum, natural gas, and other complex organic mixtures; new petrochemicals including lubricants and additives; environmental problems; and information on scientific meetings relevant to these areas.
Petroleum Chemistry publishes articles on these topics from members of the scientific community of the former Soviet Union.