Preparation and Use of Demulsifier BSA-701

After polymer flood projects performed in Gudong Oil Field,produced fluid includes some polymer.It led to serious difficulties in oil-water separation.A water base demulsifier BSA-701 containing 50%~55% active substances,which composed of 75%~90% phenolic resine initiated block-polyether,chain extended,and 10%~25% block-polyether,is prepared specially for use in dehydrating the crude oils from Gathering Center No.1 in Gudong Oil Field.At 55℃,and dosage of 100mg/L,a dehydration rate as high as 98% is observed for a crude oil of 45% water cut taken from well-drain of Gathering Center No.1 in Gudong Oil Field;At 76℃,and dosage of 100mg/L,a dehydration rate as high as 97% is observed for a mixture crude oil of 18% water cut taken from Gathering Center No.1 in Gudong Oil Field by using BSA-701 with clear water separated and even oil/water interfaces appeared and the dehydrating ability of BSA-701 is higher than all the chemicals used as comparing.With BSA-701 put into field use,the water cut of the cleaned-oil is decreased from 1.31% to 0.29%.