Experimental Studies On Heavy Oil Dehydration Of Jiang37 Block In Jiangqiao Zone

Relationship between viscosity and temperature of heavy oil and heavy oil emulsion is matched. Wax precipitation point of heavy oil is 50℃. Up and down wax precipitation point, curves of viscosity-temperature are straight lines respectively under semilog coordination, and regression coefficient is high. Under semilog coordination, curve of viscosity-temperature of heavy oil emulsion generally has a linear relationship, showing that relationship between viscosity and temperature of heavy oil emulsion is logarithmic.Heating-demulsifier dehydration experiment is carried out using heavy oil emulsion of Jiang37 block. It shows that two stage heating-demulsifier dehydration technology can be used to dispose Jiang37 heavy oil emulsion. Technological parameters of first stage heating-demulsifier settling dehydration are that dehydrating temperature is 70℃, type of demulsifier is H012, dosage of demulsifier is 150mg/L, settling time is 24h, water cut of dehydrated oil is 20%, and concentration of oil in dehydrated water is 1000mg/L. Technological parameters of second stage heating-demulsifier settling dehydration are that dehydrating temperature is 85℃, type of demulsifier is H012, dosage of demulsifier is 150mg/L, settling time is 48h, water cut of dehydrated oil is 1%, and concentration of oil in dehydrated water is 1000mg/L. Whereas settling time is long, and gas-oil ratio is very low, it is suggested that heating-demulsifier settling dehydration is to use atmospheric vertical settling tank.electric-demulsifier dehydration experiment is carried out using heavy oil emulsion of Jiang37 block. It is suggested carrying out two-stage electric-demulsifier dehydration in-situ test, parameters of electric-demulsifier dehydration are that electrode is vertical, dehydrating temperature is 70℃, type of demulsifier is H012, dosage of demulsifier is 50mg/L, dehydrating time of electric field is 30min, alternating current electric field strength is 200V/cm, direct current electric field strength is 1500~2000V/cm, water cut of dehydrated oil is 1%, and concentration of oil in dehydrated water is 1000mg/L, and it is better to use vertical pressure vessel. It is better to make electric dehydration transformer regulate load voltage automatically. Whereas resin content is high in heavy oil, and loading is difficult due to strong conductive ability of resin, it is suggested to carry on pulse electric field dehydrating test.