The oil - soluble demulsifier DCN - Ⅱ was developed according to complicated crude oil of Jianghan Oilfield, it was a chain - extended product of PO/EO diblock polyether and was prepared using modified polyether resin as initial agent. The experiment and field application showed that the product had quicker dehydration, higher dehydration rate, clearer waste water, lower used amount, and good corrosion- inhibiting capacity.
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