Research On Chemical Demulsifying Of Cruid Oil Emulsions From ASP Flooding

The article investigated the type and characteristics and demulsifying of crude oil emulsions from ASP flooding production well. Ensured demulsifier compounds which can make the water content in emulsions below 30%. And the oil content in water below 0.3%. The paper founded the analysis methods for water content in emulsions and oil content in water at the same time, founded the methods for selecting of demulsifiers and identifying of surfacetants.We collected 26 kinds of demulsifiers, and measured the hydroxyl value and cloud point and cloud point index of some demulsifiers. We simulated emulsions in two ways, and saw about the influence factors for the type and stability of emulsions. Using the crude oil emulsions 2-J1-P2 and xing 2-2-23 from ASP flooding production well as the object of demulsifying, we selected and estimated the demulsifiers. According to the result, different demulsifier compounds were ensured .The results show : (1) when the concentration of alkaline-surfactant-polymer (ASP) is settled, the ratio of water to oil is the main factor that influences the type of emulsions. The effect of ASP on the stability of simulated emulsions is in this sequence: P>A>S. (2) The simulated emulsions and the emulsions from ASP flooding production well are very different in properties, So we use the crude oil emulsions 2-J1-P2 and Xing 2-2-23 as the object of demulsifying . (3) As for 2-J1-P2 and Xing 2-2-23, the demulsifying results of demulsifiers that dissolve in oil are better than those of demulsifiers that dissolve in water. (5) The stability of emulsions from ASP flooding strengthens after they are laid aside for a long time, leaving them more difficult to be demulsified. (6) Seven demulsifier compounds are ensured which can meet the requirements for the demulsifying of 2-J1-P2 , and five demulsifier compounds are ensured for Xing 2-2-23.The handling technologies of emulsions are the main factors for the development of ASP flooding , the conclusion of this article can be used as references for further study on chemical demulsifying of crude oil emusions from ASP flooding.