The Influence of Chemical Agents on Crude Oil Demulsification and Dehydration in Shengli Oilfield and the Screening Analysis of Demulsifiers
The presence of water in crude oil poses significant hazards,as it increases equipment load and fuel consumption during the refining and transportation processes.Due to the presence of salt in water,it is easy to cause scaling and corrosion of equipment and pipelines.Therefore,in the face of the influence of water,oil drying is an important issue.In Shengli Oilfield,the influence of chemical agents on oil demulsification and dehydration was studied,and experiments were conducted on three different types of demulsifiers.The final comparison results show that polyols,positively charged gels,and polyacids have certain inhibitory effects on petroleum emulsion breaking and dehydration,among which polyacids,positively charged gels,and polyols have better inhibitory effects on petroleum emulsion breaking and dehydration.The results indicate that hydrochloric acid can accelerate the demulsification and drying properties of petroleum.In the emulsified oil prepared by adding 0.5%polyol and 2%positively charged gel,the emulsion breaking and dehydration performance of AR134 meets the design requirements.AE1910 was subjected to demulsification and dehydration tests in a petroleum emulsion containing 0.5%polymerized ethanol,and the results showed that the demulsification and dehydration performance of AE1910 met the expected indicators.In addition,after adding chemical agents,the water loss rate of the emulsion decreases,and the effluent appears yellow and turbid,with a rough surface and poor adhesion and emulsion breaking effects.The dehydration efficiency of several demulsifiers was compared,and the results showed that AR134 had the best dehydration efficiency.Therefore,AR134 can be selected as the demulsifier.
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