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- W3119098185 abstract "Hydrate formation is a major flow assurance issue for underwater multiphase pipelines. The heavy fractions in crude oil make it more complicated. However, the impact of a single fraction in oil on hydrate behaviors is still poorly understood. In response, this paper aims to investigate and compare the effects of waxes and asphaltenes on CO 2 hydrate nucleation and decomposition, using a self-designed high-pressure autoclave. The results show that both waxes and asphaltenes retard hydrate nucleation, wherein asphaltenes have a more pronounced effect than waxes. Waxes mainly restrict gas diffusion in the bulk phase during hydrate nucleation. Asphaltenes are more effectively adsorbed on the surface of the water droplet and hydrate nucleus to retard the nucleation. In addition, the decomposition rate of hydrate particles is lowered when trapped in the wax gel-like structure, whereas it is enhanced by the increased hydrate surface area with asphaltenes. This work provides insights into the effects of crude oil components on the behaviors of hydrate, which can facilitate flow assurance applications in subsea multiphase pipelines. • Both wax and asphaltene can retard hydrate nucleation. • Asphaltene is more pronounced than wax in retarding hydrate nucleation. • The dominant factor of the two fractions on the inhibition of hydrate nucleation is analyzed. • Wax hinders gas hydrate decomposition, whereas asphaltene promotes it." @default.
- W3119098185 created "2021-01-18" @default.
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- W3119098185 date "2021-04-01" @default.
- W3119098185 modified "2023-09-27" @default.
- W3119098185 title "Effects of waxes and asphaltenes on CO2 hydrate nucleation and decomposition in oil-dominated systems" @default.
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- W3119098185 doi "https://doi.org/10.1016/j.jngse.2021.103799" @default.
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