The composition of acid/oil interface in acid oil emulsions  

作　　者：Yulia M.Ganeeva Tatiana N.Yusupova Ekaterina E.Barskaya Alina Kh.Valiullova Ekaterina S.Okhotnikova Vladimir I.Morozov Lucia F.Davletshina 

机构地区：[1]Arbuzov Institute of Organic and Physical Chemistry,FRC Kazan Scientifi c Center,Russian Academy of Sciences,Arbuzov str.8,Kazan 420088,Russian Federation [2]Gubkin Russian State University of Oil and Gas(National Research University),Leninsky Prospekt 65,Moscow 119991,Russian Federation

出　　处：《Petroleum Science》2020年第5期1345-1355,共11页石油科学（英文版）

摘　　要：In well stimulation treatments using hydrochloric acid,undesirable water-in-oil emulsion and acid sludge may produce and then cause operational problems in oil field development.The processes intensify in the presence of Fe(Ⅲ),which are from the corroded surfaces of field equipment and/or iron-bearing minerals of the oil reservoir.In order to understand the reasons of the stability of acid emulsions,acid emulsions were prepared by mixing crude oil emulsion with 15% hydrochloric acid solutions with and without Fe(Ⅲ) and then separated into free and upper(water free) and intermediate(with water) layers.It is assumed that the oil phase of the free and upper layers contains the compounds which do not participate in the formation of acid emulsions,and the oil phase of the intermediate layers contains components involved in the formation of oil/acid interface.The composition of the oil phase of each layer of the emulsions was studied.It is found that the asphaltenes with a high content of sulfur,oxygen and metals as well the flocculated material of protonated non-polar oil components are concentrated at the oil/acid interface.In addition to the above,in the presence of Fe(Ⅲ) the Fe(Ⅲ)-based complexes with polar groups of asphaltenes are formed at the acid/oil interface,contributing to the formation of armor films which enhance the emulsion stability.

关 键 词：Acid emulsions Ferric cations Acid/oil interface ASPHALTENES Resins Waxes Oil paramagnetic particles Fe(Ⅲ)-based complexes 

分 类 号：TE357[石油与天然气工程—油气田开发工程]