醋酸铬-酚醛树脂预聚体/HPAM体系的复合交联反应机理研究  

Mechanism of Composite Crosslinking Reaction of Chromium Acetate-phenolic Resin Prepolymer/HPAM System

作　　者：展转盈 王仙仙 张磊[3] ZHAN Zhuanying;WANG Xianxian;ZHANG Lei(School of Chemistry and Chemical Engineering,Xi’an Petroleum University,Xi’an,Shaanxi 710068,P R of China;Research Institute of Shaanxi Yanchang Petroleum(Group)Co.Ltd,Xi’an,Shaanxi 710068,P R of China;Faculty of Earth Resources,China University of Geosciences(Wuhan),Wuhan,Hubei 430074,P R of China)

机构地区：[1]西安石油大学化学化工学院,陕西西安710065 [2]陕西延长石油(集团)有限责任公司研究院,陕西西安710065 [3]中国地质大学(武汉)资源学院,湖北武汉430074

出　　处：《油田化学》2022年第2期301-305,共5页Oilfield Chemistry

摘　　要：复合醋酸铬和酚醛树脂预聚物(PRP)既可以提高HPAM/Cr^(3+)凝胶的热稳定性,也可以降低HPAM/PRP凝胶的反应活化能,同时还可以提高凝胶的力学性能。但是,目前关于Cr^(3+)-PRP与HPAM的复合交联反应机理尚不清楚。先通过表征Cr^(3+)-PRP溶液与PRP溶液的性能差异,明确了Cr^(3+)与PRP之间的化学反应过程;随后通过对比Cr^(3+)-PRP/HPAM与Cr^(3+)/HPAM、PRP/HPAM之间的反应差异,揭示了Cr^(3+)-PRP/HPAM的复合交联反应机理。在Cr^(3+)-PRP溶液中,由于PRP苯环上的羟甲基和酚羟基的活性高于醋酸根,从而形成了一种新的多核羟桥络合物离子(Cr^(3+)-PRP络合物)。Cr^(3+)-PRP/HPAM体系发生多重复合反应,首先是Cr^(3+)-PRP络合物中的部分Cr^(3+)与HPAM产生交联反应,随后是络合物中的剩余Cr^(3+)和全部的PRP与聚合物同时发生交联反应,而且Cr^(3+)/羧基的交联反应与PRP/酰胺基团的交联反应会相互影响。实验结果促进了对Cr^(3+)-PRP/HPAM体系的交联本质的认识,为其高效应用奠定了一定的理论基础。Based on the respective characteristics of gel conformance control systems of HPAM/Cr^(3+) and HPAM/phenolic resin prepolymer,the chromic acetate and phenolic resin prepolymer(PRP)composite can not only improve the thermal stability of HPAM/Cr^(3+) gel,but also promote the better application of HPAM/PRP gel in low-medium temperature oil reservoirs.Besides,it can improve the mechanical properties of the HPAM gel.However,the mechanism of the composite cross-linking reaction between Cr^(3+)-PRP and HPAM is still unclear.Therefore,by characterizing the performance differences between Cr^(3+)-PRP solution and PRP solution,the chemical reaction process between Cr^(3+) and PRP was studied.Thus,by comparing the reaction differences between Cr3+-PRP/HPAM and Cr3+/HPAM,PRP/HPAM,the mechanism of the composite crosslinking reaction of Cr3+-PRP/HPAM was revealed.In a Cr3+-PRP solution,because the hydroxymethyl and phenolic hydroxyl groups on the benzene ring of PRP are more active than acetate,a new polynuclear hydroxyl bridge complex ion(Cr3+-PRP complex)was formed.The cross-linking reaction between the Cr^(3+)-PRP complex and HPAM was a multiple complex reaction.At first,part of Cr^(3+)from the Cr^(3+)-PRP complex reacted with HPAM,and then the remaining Cr^(3+)and all PRP in the complex reacted with the polymer at the same time.The cross-linking reaction of Cr^(3+)and carboxy group could affect the cross-linking reaction of PRP and amide group.The reaction process of Cr^(3+)-PRP complex with HPAM was different from the superposition of the reaction of Cr^(3+)/HPAM and PRP/HPAM.The experimental results promoted the understanding of the crosslinking mechanism of Cr3+-PRP/HPAM system,which could lay a certain theoretical foundation for its efficient application.

关 键 词：非均质油藏 凝胶调剖 复合交联反应 醋酸铬 酚醛树脂预聚体 

分 类 号：TE358[石油与天然气工程—油气田开发工程]