醋酸铬-酚醛树脂预聚体/HPAM体系的复合交联反应机理研究
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1.中国石油新疆油气田分公司工程技术研究院,新疆克拉玛依;2.长江大学化学与环境工程学院,湖北荆州;3.中国地质大学(武汉)

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Study on the mechanism of composite crosslinking reaction of chromium acetate-phenolic resin prepolymer/HPAM system
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China University of Geosciences (Wuhan)

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    摘要:

    HPAM凝胶调剖是我国老油田开发的一项重要稳产手段。在现有的HPAM凝胶体系中,HPAM/Cr3+体系和HPAM/酚醛树脂预聚物体系是最常用的。基于各自的特性,复合Cr3+和酚醛树脂预聚物(PRP),既可以提高HPAM/Cr3+凝胶的热稳定性,也可以促进HPAM/PRP凝胶更好地应用于中低温油藏,同时还可以提高凝胶的力学性能。但是,目前关于Cr3+-PRP与HPAM的复合交联反应机理尚不清楚。因此,本文通过表征Cr3+-PRP溶液与PRP溶液的性能差异,研究了Cr3+与PRP之间的化学反应过程。在Cr3+-PRP溶液中,形成了一种新的多核羟桥络合物离子(Cr3+-PRP络合物),其物性参数不同于PRP溶液或醋酸铬溶液的叠加。Cr3+-PRP络合物与HPAM之间的交联反应是多重复合反应,其与HPAM的反应过程不同于Cr3+/HPAM与PRP/HPAM的反应叠加。在交联反应过程中,Cr3+与羧基的交联会对PRP与酰胺基的交联产生影响。实验结果促进了对Cr3+-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。

    Abstract:

    Conformance control by using HPAM gel is the main treatment method for the stabilized production of mature oilfields with high water in China. Among the existing HPAM gel systems, the most commonly used are HPAM/Cr3+ system and HPAM/phenolic resin prepolymer system. Based on their respective characteristics, the composite Cr3+ and phenolic resin prepolymer (PRP) can not only improve the thermal stability of HPAM/Cr3+ 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 Cr3+-PRP and HPAM is still unclear. Therefore, by characterizing the performance difference between Cr3+-PRP solution and PRP solution, the chemical reaction process between Cr3+ and PRP are studied in this paper. In the Cr3+-PRP solution, a new polynuclear hydroxyl bridge complex ion (Cr3+-PRP complex) is formed. Its physical parameters are different from the superposition of PRP solution and chromium acetate solution. The cross-linking reaction between the Cr3+-PRP complex and HPAM is a multiple complex reaction. The cross-linking reaction of Cr3+ and carboxy group can affect the cross-linking reaction of PRP and amide group. The reaction process of Cr3+-PRP complex with HPAM is different from the superposition of the reaction of Cr3+/HPAM and PRP/HPAM. The experimental results promote the understanding of the crosslinking mechanism of Cr3+-PRP/HPAM system, which can lay a certain theoretical foundation for its efficient application.

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  • 收稿日期:2021-01-07
  • 最后修改日期:2021-04-02
  • 录用日期:2021-05-12
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