Analysis of Physical Properties of Aged Oil from Different Sources and Experimental Study on Optimizing Thermochemical Dehydration Parameters
The advancement of the oilfield development stage,the use of a large number of oilfield chemicals,the reproduction of sulfate-reducing bacteria,the enrichment of flocs in the gathering and transportation system and other factors enhances the stability of the crude oil emulsion and forms the aged oil that is difficult to treat.Aged oil has a significant difference in composition compared to normal crude oil,resulting in higher physical properties such as pour point,density,and viscosity,making it difficult for aged oil to demulsify.In this article,taking aged oil from multiple sources as the research object,by analyzing the impurity content,ferrous sulfide content,resin,asphaltene content,and other components of aged oil from multiple sources and conventional crude oil,the influence of aged oil components on physical properties such as pour point,density,and viscosity was studied.Indoor thermochemical experiments were conducted to optimize demulsifiers and demulsification parameters for mixtures of aged oils from different sources.The results showed that most of the light components such as saturated hydrocarbons and aromatics in the aged oil evaporated,while heavy components such as resins,asphaltenes,and flocs increased.At the same time,due to the large number of small impurity particles in the aged oil,the physical properties such as pour point,density,and viscosity were higher than those of normal crude oil.The thermochemical experiment screened out AP-8736,a demulsifier with better dehydration effect from 10 types of demulsifiers.The optimal treatment temperature and mass concentration were ultimately determined to be 65℃and 200 mg·L-1.
Aged oilPhysical property analysisCauses of agingThermo-chemical dehydration
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