Experiment Study On The Single-stage Downhole Hydrocyclone Separator

In this paper, the development of hydrocylone , its application on oil field and its basic characteristics are introduced. The down-hole oil-water separation system is composed of screw pump and hydrocyclone, with the structure pattern of"injection down, production up". It can solve the high water content of the production fluid, and the high processing capacity of the ground oil-water.By the analysis of the structural and operating parameters of the separator, the main structural parameters of the downhole rotary splitter are identified. Using the CFD software FLUENT, the work of the hydrocylone is simulated. The optimal split ratio range is determined and it saves time and the experimental expenses for the subject research. The results indicate that inlet oil content changing within a certain range, the separation effect has no significantly change. To ensure the safety of the entire system and the higher service time , stress analysis of the main components of the apparatus rotary splitter are conducted. Laboratory experiment were carried out under different split ratio .The results show that the downhole hydrocyclone has the most separation efficiency and the most overall separation efficiency when the split ratio is 25%, separation efficiency up to 99.7% (average).Finally, oil field experiments are carried out. The data that came from the system in the downhole ran continuously shows that the water ratio decreases by 7 percentage points, cumulative reduction up to 14115.81m3 in 149 days.The application of this technology can solve the high water content of the production fluidt and the heavy workload of the separation in the process of the high water cut oil field development. It also can address the huge economic losses and energy consumption caused by water injection and is a promising technique.