摘要
为了探索磺酸甜菜碱型两性聚丙烯酰胺/铬凝胶的自修复行为,分析体系中聚丙烯酰胺的类型、酸的种类,以及重铬酸钠、硫脲的质量分数、硫酸钠质量浓度对凝胶自修复行为的影响.结果表明：磺酸甜菜碱型两性聚丙烯酰胺/铬凝胶的自修复行为主要与两性聚丙烯酰胺的分子结构有关,凝胶经剪切破碎后,聚合物分子的疏水作用和静电作用导致凝胶的重新聚集而实现自修复;无机盐硫酸钠质量浓度是影响凝胶自修复性能的一个重要因素,最佳硫酸钠质量浓度为220~1 600mg/L;酸的种类与凝胶的自修复性能无关,主要是影响凝胶的成胶时间,其中乳酸能够形成有机铬,铬离子经过水解和羟桥作用形成多核羟桥络离子,再与聚丙烯酰胺中的—COO—配位形成网络结构的凝胶;重铬酸钠和硫脲为体系提供Cr3＋,它们的质量浓度与凝胶的自修复行为无关.南5-10-P50井组应用结果表明：60d后凝胶黏度恢复率超过60%,调剖后启动压力平均提高3 MPa以上.
In this paper,the different types of polyacrylamide,acid and the concentration of sodium dichromate,sulfourea,sodium sulfate were investigated to study the self-healing behavior of the amphiprotic polyacrylamide/Cr gel system.The experimental results showed that the self-healing behavior was mainly related to the molecular structure of the amphiprotic polyacrylamide.After shearing,the gel resembled by the hydrophobic and electrostatic interactions of polymer molecules to achieve self-healing behavior.An important factor that affected gel self-healing was the concentration of sodium sulfate.There was an optimum range,which was 220~1 600 mg/L.The kinds of acid were irrelevant to the self-healing,which mainly affected the gelling time.The role of lactic acid was the ability to form organic chromium,which formed multinuclear olation complex ions by the effect of hydrolyzed and hydroxyl bridge,finally,the gel with network structure was formed by coordinating with—COO—.The sodium dichromate and sulfourea only provided Cr3+,and the concentration had nothing to do with self-healing behavior.The experimental results of the South 5-10-P50 well show that the viscosity recovery rate of the gel was over 60% after 60 days,and the average starting pressure increased above 3MPa after profile control.
出处
《东北石油大学学报》
CAS
北大核心
2015年第4期88-94,11,共7页
Journal of Northeast Petroleum University
基金
国家科技重大专项(2011ZX05052)
关键词
自修复性能
铬凝胶
两性聚丙烯酰胺
调剖堵水
self-healing ability
chromium gel
amphiprotic polyacrylamide
profile control and water shutoff
作者简介
周万富（1963-），男，博士，高级工程师，主要从事油田应用化学方面的研究．
