Above is the case in Changqing Oilfield. The daily liquid capacity of this block is 40m^3, and the comprehensive water cut is about 70%. After the automatic separator is installed, the comprehensive water content in the oil storage tank is lower than 5%, and the free-water is automatically removed into the water storage tank, which greatly reduces the cost of oil transportation, and also the waste water after being purified can be injected back to the ground to even boost the petroleum production.

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