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Crude oil emulsion often occurs in the production and refining of oil products The world's major crude oils are produced in the form of an emulsion Oil may disperse finely in water In this case, emulsion is an oil in water type Water is called a continuous phase, while oil is called a dispersed phase Conversely, if oil is a continuous phase and water is a dispersed phase, the emulsion is called an oil in water type Each oil field will encounter such problems in the middle and later period of crude oil exploitation With the increase of gum and asphaltene content in crude oil, crude oil emulsion becomes more stable In addition, with the continuous update of new technology, a large number of surfactants are used to drive oil, making the composition of crude oil more complex, which poses a greater challenge to crude oil demulsification Therefore, we need to study the factors that affect the stability of crude oil emulsion and the mechanism of demulsification to find a better demulsifier It is generally believed that the demulsifier needs to undergo oil separation, flocculation, membrane drainage and coalescence When the demulsifier is added, it will diffuse to the oil-water interface Because the interfacial activity of demulsifier is higher than the interfacial activity of the film-forming substance in the crude oil, it can adsorb or partly replace the natural emulsifier adsorbed on the oil water interface, and form a mixed film with lower strength than the original interface film, resulting in the destruction of the interfacial film and releasing the water contained in the membrane The droplets coalesce with each other to form large water drops and settle to the bottom, and the oil-water two phases are separated, so as to achieve the purpose of demulsification Using Lumi series stability analyzer, the demulsifier with good Zui effect can be screened out quickly Test 1: use lumireader PSA SOP: 60 ° C, 17h, 1 g sample: 3 oil in water type crude oil emulsions One sample added a demulsifier The above picture shows 3 tubes of oil in water emulsion in the visual state of the sample tube after static 17h, of which the right one plus a demulsifier is 3 The curve of the integral transmittance of a water in oil emulsion varies with time The faster the curve changes (the greater the slope), the worse the stability of the sample In this case, we found that the crude oil emulsion with demulsifier was fast separated from Zui Test 2: uses LUMiSizer (Accelerated) SOP:60 degree C, 20min, 2300G sample: mixing the same crude oil emulsion (0/W) with 6 different demulsifying agents of the same dosage is illustrated by the transmittance fingerprint of the same crude oil emulsion (0/W) and 6 different demulsifier combinations The abscissa of the fingerprint corresponds to the position of the sample tube, the top of the sample tube is on the left and the bottom of the sample tube is on the right; the ordinate of the fingerprint corresponds to the transmittance value With the development of the experiment, the transmittance of the bottom of the sample tube becomes higher, that is to say, the particles float upward The more "violent" the change of transmittance, the more unstable the sample The results show that sample 4490 is a good demulsifier for Zui In view of the current situation of the use and research of crude oil demulsifiers in China and the increasingly strict environmental protection requirements, the research and application of new demulsifiers are becoming more and more urgent At present, the compound demulsifier has been paid more and more attention because of its low temperature demulsification, low dosage, saving heat energy, fast demulsification, improving equipment treatment efficiency, expanding the scope of application of demulsifier to crude oil and overcoming the weakness of too strong demulsifier specialty Combined with Lumi series stability analyzer, it can help the research and development breakthrough of crude oil industry more quickly