Abstract:

The authors used a bifunctional reducing agent containing degradable groups and oxidized metal ions as a redox agent to initiate free radical polymerization and synthesize a polymer damper to build degradable groups on the vinyl polymer backbone. The results showed that the azo groups were degradable under high temperature and also had high hydrolytic stability. The degradation behavior of polymeric drag reducers containing temperature-sensitive azo groups was characterized by gel permeation chromatography (GPC), which demonstrated that the polymer backbone contained multiple unstable bonds. It was also found that the drag reducers with azo bonds on the polymer main chain had as good drag reducer properties as the pure drag reducers. However, those with azo bonds in the main chain will lose their damping performance once subjected to high temperatures. This study provides a reference for the selection of low-injury multifunctional slickwater fracturing fluid systems suitable for shale gas reservoirs.

Key words: Drag reducing agent water solution, Polymer, Low damage, Degradable

摘要：

将含有可降解基团和氧化金属离子的双功能还原剂作为氧化还原剂引发自由基聚合，合成聚合物减阻剂，从而在乙烯基聚合物骨架上构建了可降解基团；通过凝胶渗透色谱(GPC)对含温度敏感型偶氮基团的聚合物减阻剂进行分子质量测定，并对其降解行为进行了研究。结果表明，偶氮基团在高温下可被降解，同时具有较高的水解稳定性；聚合物主链上含有多个不稳定键；聚合物主链上含偶氮键的减阻剂与纯减阻剂一样具有良好的减阻性能；聚合物主链上含偶氮键的减阻剂一旦受到高温的影响会失去减阻性能。研究结果可为选择适合煤层气储层的低伤害、多功能的滑溜水压裂液体系提供参考依据。

关键词: 减阻剂水溶液, 聚合物, 低伤害, 可降解