关键词: 降凝剂, 原油, 高分子, 表面活性剂, 聚合物, 降粘, 降凝

Abstract: The terpolymer composed of ethylene,vinyl acetate and polyether of vinyl alcohol is a new surfactant type pour point depressant (WHP) with high molecular weight.It possesses both polymer property and a certain surfactive activity.As compared with commonly used pour point depressants,such as EVA and polyacrylate of high carbon alcohol etc.the terpolymer has very nice pour point-depressing effect whether for Tuha crude and Xinjiang mixed crude (both of them contain some C₃₇-C₆₃ high carbon number wax) or for Jianghan crude,Luning pipeline crude and Zhongluo pipeline crude (all of them contain C₁₂-C₄₀ common carbon number wax).For example,for Tuha crude,when the dosage is 50mg/l,the common pour point depressants do not have any pour point-depressing effect,but the WHP could reduce the pour point of Tuha crude from 17℃ to 10℃.And for Xinjiang crude,when the dosage is 20mg/l,the WHP could reduce the pour point of this crude from 11℃ to -15℃,but the best one of other pour point depressants only reduces the pour point of this crude to -8℃.Even if for the Jianghan crude with high pour point when the dosage is 100mg/l,the other common pour point depressants only could reduce the pour point of this crude from 34℃ to 22℃,but the WHP could reduce the pour point of this crude from 34℃ to 14℃.In addition,WHP still possesses certain viscosity-reducing ability for Luning pipeline crude,after adding 40mg/l of WHP,at 30℃,the viscosity-reducing extent is 25.2%,and for other common pour point depressants,at the same dosage and same temperature,the maximum viscosity-reducing extent is only 14%. Through simulating flow test of crude in Luning pipeline in laboratory,after adding WHP,the crude was undergone stirring shear in turn at low turning speed (80r/min)and high turning speed (1500r/min)many times,the pour point-rising extent of this crude was reduced very much and the viscosity-rising extent of this crude still was impoved some little.

Key words: pour point depressant, crude oil, high molecular surfactant, polymer, viscosity reducing, pour paint reducing