滑溜水返排液反相破乳剂的开发及破乳机理
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摘要
以三甲基羟乙基丙二胺为起始剂,KOH为催化剂,通过环氧乙烷(EO)和环氧丙烷(PO)的开环聚合,在120℃下合成了一系列二嵌段和三嵌段聚醚反相破乳剂。FTIR和1HNMR结果表明合成产物与设计结构一致。通过瓶试法对滑溜水返排液进行了破乳实验,结果表明:具有三嵌段结构,且n(EO)∶n(PO)∶n(EO)=1∶6∶12的破乳剂脱水率大于97%,具有良好的破乳效果。动态界面张力的扩散动力学研究表明,EPO-8反相破乳剂从水相扩散至界面速率快,在油表面吸附性和降低界面膜强度的能力更强,是其破乳性能良好的主要原因。
A series of diblock and triblock polyether reverse demulsifiers were synthesized by using2-[[3-(dimethylamino)propyl]methylamino]ethanol as starting material, potassium hydroxide as catalyst through open-loop polymerization of ethylene oxide(EO) and propylene oxide(PO) at 120 ℃. The spectral results obtained from FTIR and NMR revealed that the structure of the synthesized products was consistent with the theoretic design. The demulsification results showed that the reverse demulsifier with triblock structure [n(EO)∶n(PO)∶n(EO) =1∶6∶12] had a good demulsification performance for slickwater flowback fluid. Its dehydration rate was greater than 97%. The results of dynamic interfacial tension and interfacial dilational modulus experiments demonstrated that EPO-8 had faster diffusion rate to interface and better performance for decreasing the film strength, which was the main reason for its outstanding demulsification performance.
A series of diblock and triblock polyether reverse demulsifiers were synthesized by using2-[[3-(dimethylamino)propyl]methylamino]ethanol as starting material, potassium hydroxide as catalyst through open-loop polymerization of ethylene oxide(EO) and propylene oxide(PO) at 120 ℃. The spectral results obtained from FTIR and NMR revealed that the structure of the synthesized products was consistent with the theoretic design. The demulsification results showed that the reverse demulsifier with triblock structure [n(EO)∶n(PO)∶n(EO) =1∶6∶12] had a good demulsification performance for slickwater flowback fluid. Its dehydration rate was greater than 97%. The results of dynamic interfacial tension and interfacial dilational modulus experiments demonstrated that EPO-8 had faster diffusion rate to interface and better performance for decreasing the film strength, which was the main reason for its outstanding demulsification performance.
引文
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[3]Li Yongfei(李永飞),Wang Yanling(王彦玲),Cao Xunchen(曹勋臣),et al.Progress in research and application of drag reducing agent for shale reservoir fracturing[J]Fine Chemicals(精细化工),2018,35(1):1-9.
[4]Xu Hongjun(徐洪君).Research and application of demulsifier for O/W type polymer-flooding produced fluid[J].Industrial Water and Wastewater(工业用水与废水),2013,44(2):45-48.
[5]Liu Longwei(刘龙伟),Guo Rui(郭睿),Xie Chuanmei(解传梅),et al.Synthesis and properties of a demulsifier for oil-inwater crude oil emulsion[J].Pertrochemical Technology(石油化工),2014,43(9):1053-1057.
[6]Wang Xiaojing(王小静),Zhou Lihui(周立辉),Xu Renjun(许人军),et al.Synthesis and performance of a kind of comb-type modified polysiloxane heavy oil demulsifier[J]Fine Chemicals(精细化工),2017,34(11):1301-1307.
[7]Atta A M,Abdullah M M S,Al-Lohedan H A.Demulsification of heavy crude oil using new nonionic cardanol surfactants[J].Journal of Molecular Liquids,2018,252:311-320.
[8]Kang W L,Guo L M.Fan H M,et al.Flocculation,coalescence and migration of dispersed phase droplets and oil-water separation in heavy oil emulsion[J].Journal of Petroleum Science and Engineering,2012,81:177-181.
[9]Zolfaghari R,Fakhru'l-Razi A,Abdullah L C,et al.Demulsification techniques of water-in-oil and oil-in-water emulsions in petroleum industry[J].Separation and Purification Technology,2016,170:377-407.
[10]Kedar V,Bhagwat S S.Effect of polar head surfactants on the demulsification of crude oil[J]Petroleum Science and Technology,2018,36(2):91-98.
[11]Abullah M M S,Al-Lohedan H A,Attah A M.Synthesis and application of amphiphilic ionic liquid based on acrylate copolymers as demulsifier and oil spill dispersant[J].Journal of Molecular Liquids.2016,219:54-62.
[12]Tan Guorong(檀国荣),Zhang Jian(张健).Preparation and compound of demulsifier for heavy oil by polymer flooding[J].Chemical Engineer(化学工程师),2012,199(4):50-56.
[13]Li Jiajun(李家俊).Application of an efficient reversed-phase demulsifier in offshore oil fields[J].Tianjin Chemical Industry(天津化工),2017,31(1):26-28.
[14]Oil-in-water emulsion emulsifier performance evaluation method:SY/T 5797-93[S].Beijing:Petroleum Industry Press(石油工业出版社),1993.
[15]Bottle test method for the demulsification performance of crude oil demulsifiers:SY/T 5281-2000[S].Beijing:Petroleum Industry Press(石油工业出版社),2000.
[16]Miao Ling(苗领).Effect of asphaltene on the emulsion stability of simulated produced water from ASP(alkaline/surfactant/polymer)flooding[D].Jinan:Shandong University(山东大学),2015.
[17]Li Wei(李伟).Study of DIFT of surfactant and polymer in EOR[D].Beijing:Beijing Jiaotong University(北京交通大学),2008.
[18]Li Jiexun(李杰训).Research on emulsification and demulsification for ASP flooding produced liquid in the N1 block[D].Daqing:Northeast Petroleum University(东北石油大学),2011.
[19]Fossen M,Kallevik H,Knudsen K D,et al.Asphaltenes precipitated by a two-step precipitation procedure.1.Interfacial tension and solvent properties[J].Energy Fuels,2007,21(2):1030-1037.
[20]Fan Y R,Simon S,Sjoblom J.Chemical destabilization of crude oil emulsions:Effect of nonionic surfactants as emulsion inhibitors[J].Energy Fuels,2009,23(9):4575-4583.
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