关键词: 辽河油田, 超稠油, 井筒掺活性水降粘工艺, 先导性试验, 经济效益

Abstract: The viscosity reduction technology for ultra-heavy oil in wellbore with electric heating technique can result in higher energy loss.The viscosity reduction technology by blending active water into wellbore was developed.The experiment result shows that the viscosity rate of ultra-heavy oil can greatly reduced using this technology.The automatic demulsification and dewatering characteristics are better.The content of water in purified oil is 3% after automatically settling for 72 hours at 85℃.The content of water in purified oil reduced to 1% after adding demulsifier with a concentration of 0.04% into low-viscosity oil-water emulsifier and automatically settling for 72 hours at 85℃.The pilot test of viscosity reduction technology by blending active water performed in eight ultra-heavy oil wells in Liaohe Oilfield showed that the blending active water technology could substitute the viscosity reduction technology by electric heating.The electric current of pumping unit in the tested oil well was reduced by 10A to 30A,and the viscosity of liquid produced from wellbore was greatly reduced.The sewage reinjection and mixing technology can save much fresh water.The blending active water technology can reduce the lifting cost of oil production and save energy consumption greatly.

Key words: Liaohe Oilfield, ultra-heavy oil, viscosity reduction technology by blending active water into wellbore, pilot test, economic benefit