Asphaltene study is now becoming a regular menu as a part of gas injection studies1-11. The asphaltene onset pressure (AOP) is<br>one of the most important factors to understand asphaltene precipitating behavior. The SDS (solid detection system) based on<br>light scattering technique has been quite popular and widely used in all over the world1,7-9,12-15. The simple experiments to<br>measure AOP are usually conducted using mixture of reservoir fluid and injection gas, and various gas mixing volume are<br>assumed to be investigated. These various experimental specification of gas mixing volume are useful to understand<br>asphaltene risks during gas injection projects. However, what this investigation can show is just a static asphaltene behavior,<br>and sometimes might overlook true asphaltene risks.


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