Research and application of the high efficient crude oil mixed demulsifiers SWT-111

Aiming to solve the problems such as slow dewater rate and thick emulsification layer regarding the crude oil demulsification and dehydration process in the gathering and transportation station of Yanchang oilfield,SW-111 demulsifier was developed by coordinating ployether and additives with two imitators.This demulsifier reduced the water content of crude oil by 0.2% that was 0.5%less than the minimum sandards with a small dosage of 200 mg/L,which indicated that,as compared with the original demulsifier,SW-111 demulsifier had faster dehydration rate,higher dehydration efficiency and thinner demulsification layer.