Design And Property Research Of New-type Hydrocyclone For Well Production Dewatering

With the oil fields get to the end of exploitation, water cut of well production increases rapidly, which brings great challenges to the following oil gathering and processing system. Due to low separation efficiency and high investment, it’s irrational to solve the problem mentioned above with the vessel separators based on grativty separation. Moreover, with the rapid development of offshore oil and gas resource, traditional diaposal technologies and vessel separators becomes unable to satisfy the production requirement due to the limited space and load of platforms. Therefor, it’s essential to design and research equipments for well product dewaterered with compact structures and high separation efficiency.In this paper, based on the systematic summarization of the research and application of hydrocyclones, we choose the axial hydrocyclone as the research object. Combined with the design of tangential hydrocyclone, we devolop the structure design method of axial hydrocyclone, and prove its feasibility. Moreover, with the help of CFD software FLUENT, we study the influence on the separation performance of different structure factors with orthogonal experiment. Based on the design method, we design an engineering prototype with a throughput of 30m3/h. With the help of FLUENT, we study the influence on the separation performance of different structure factors with simple factor experiment, and get the optimum dimensions of different structure factors. Ane then we study the influence on the separation performance of different operation conditions. Based on the results of simple factor experiment, we optimize the structure dimensions with Response Surface Methodology(RSM). And finally, we get the optimal group of structural factors.In order to test the performance of axial hydrocyclone, so as to offer guide for engineering prototype experiment, we design a prototype with small throughput and run the experiment. Firstly, we compare the scheme of oil-water mixture preparation with high oil content and choose a most favorable scheme. And then, study the influence on the separation performance with different throughput and split ratio, get the optimal range of throughput and split ratio. It proves that with the throughput at 100%~120% narmal throughput, split ratio at 10%~15% inlet flow, the separation efficiency is satisfying. In order to decrease the oil content in the water outlet, we increase the length of the cone section and get satisfied results.Through the combination of theory research and experiments research, we provided some technical reference for the design of the axial hydrocyclone for dewatering and some experience for engineering application and product development.