Experimental Study on Overflow Pipe Structure of the Rod Pump with Down-Hole Oil-Water Hydrocyclone

For the problem of high water cut oil producing well, the technology that the oil-water is separated and injected to down hole can reduce cost price. The down-hole oil-water separation system is composed of double fluid flow pump, oil-water hydrocyclone and oil lift pump. This system runs well on site. Experimental study finds that the hydrocyclone which has cylinder-cone-inverted cone overflow pipe can reduce the short-circuit flow, and that the average separation efficiency of the hydrocyclone can reach 98.1%, and that the average reduction rate of separation efficiency is 0.51% in intermittent flow, and it decreases slowly with the ratio of split ratio divided by oil content increasing.