Almost all hydrocyclones used for the separation of produced water are static equipments. Just as its name implies, the static hydrocyclone has no internal moving components or external power supply. Special structure and pressure difference between its inlet and outlets can lead multi-phase liquid to flow under helical track. Thus, insoluble multi-phase media will be separated under the centrifugal force by helical motion. Static hydrocyclone has been widely used especially on offshore platforms because it need minor space and few supporting facilities. But every hydrocyclone should be customized because the given structural parameters will bring corresponding separating effect. This costs longer time and more money during the stage of design and performance test. Building upon previous work on static hydrocyclone and some efforts about dynamic hydrocyclone, we designed the combined hydrocyclone which combines the power section of dynamic hydrocyclone and separating section of static hydrocyclone, but has independent transformation principle and control mode. It can adapt to wider flow range by preparing reasonable power supply and processing capacity of the separating section. Dynamic matching of velocity and liquid flow, optimum design of the key components, stability of the flow field of the separating section and some performance tests is discussed in this paper.

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