In order to improve the oilfield waste water treatment efficiency, a new type separation equipment hydrocyclone-filter is developed. With the main separating structure manufactured with PE-X series capillary material, the hydrocyclone-filter’s separating capability and the relationship between the oil concentration in the filtered water and the filtering speed are all discussed in detail. The tests in lab indicate that the top separating efficiency 99.5% can be gained when the split-ratio is 15% on the PE-8 capillary material cyclone body, and the value 15% is the optimal split-ratio to all type cyclone separating body (PE-X series).The new equipment hydrocyclone-filter offers a new measure to the sewage treatment in oil field.

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