One of the problems in heavy oil thin mixing and viscosity reduction technology is heavy and thin oil mixed uneven. The mixer is the main tool to improve mixing effective. Firstly, the thin mixing viscosity reducing mechanism and mixing mechanism were analyzed. In order to improve mixing effective, a mixing element was needed to use in the oil string. In view of several mixer existing at present, according to whether have free rotation impeller, the mixer is divided into static mixer and dynamic mixer. Static mixer is easy to cause the flow channel blockage, and the mixing effective is greatly influenced by fluid velocity. Dynamic mixer has rotation energy insufficiency, and mixing effective is not good. A new mixer was designed, with a rotating impeller and a stirring impeller. The rotating impeller rotates under the impact of the fluid and provides power for the stirring impeller, while the stirring impeller active rotation driven by the rotating impeller. By simulation analysis and comparison, from the speed trace and thin oil volume fraction distribution curve, the new mixer has stronger mixing effective than automatic rotary dynamic mixer.%稠油掺稀降粘开采时,存在稠油与稀油混合不均匀的问题,而混合器是目前掺稀降粘工艺中提高混合效果的主要工具.首先分析了掺稀降粘机理和混合机理,因此,要提高掺稀混合效果,就需要在掺稀管柱中增加混合元件.针对目前存在的几种混合器,根据有无自由旋转的叶轮分为静态混合器和动态混合器,而静态混合器容易造成流道堵塞,混合效果受流体流速影响较大等问题,现有动态混合器存在旋转动力不足,搅拌效果不好等问题.新型混合器设计有旋转动力叶轮和搅拌叶轮,旋转动力叶轮在流体的冲击下旋转提供动力,搅拌叶轮在旋转动力叶轮的带动下主动旋转.通过仿真对比分析发现,从速度迹线和稀油体积分数分布曲线来看,新型混合器比自动旋转动态混合器有更强的混合效果.
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