疏水缔合聚合物/酚醛树脂冻胶反应进程及影响因素

Crosslinking Reaction Process and Influencing Factors for Formation of Hydrophobically Associating Polymer/Phenolic Resin Gel

本文研究的冻胶由疏水缔合聚合物HAP与酚醛树脂YG103交联而成。用流体流动行为指数n和零剪切黏度η0表征酚醛树脂冻胶成冻过程的流变行为,其交联过程分为诱导期、增长期和稳定期3个阶段,证实了冻胶的形成既有化学交联又有明显的物理交联。研究了HAP与YG103加量、温度、矿化度、pH值对冻胶成冻时间和冻胶强度的影响。成冻时间和冻胶强度分别用目测代码评价方法和突破真空度法测定,研究结果表明：在本实验条件范围内,HAP和YG103浓度越大、温度越高、矿化度越高,成冻时间越短,冻胶强度越高。无机盐对成冻体系的影响大小为：CaC l2〉MgC l2〉NaC l,当成冻体系的pH值在9~10时,成冻时间最短。为海上油田聚合物驱的深部液流转向提供理论基础和技术支持。

The gel was composed of hydrophobically associating polymer（HAP） and phenolic resin（YG103）.Rheological behavior of this aqueous gel in crosslinking reaction process was characterized by flow behavior index（n） and zero-shear-rate viscosity（η0）.The crosslinking reaction process could be divided into induction period,growth period and stabilization period.It was verified that the formation of the gel was not only a chemical crosslinking action but also a significant physical crosslinking action.The influencing factors for formation of hydrophobically associating polymer/phenolic resin gel were also studied.The gelation time and the gel strength were separately measured by gel strength codes method and breakthrough vacuum method.It was shown that under the experimental conditions the gelation time decreased and the gel strength increased with increasing HAP and YG103 concentrations,gelation temperature and salinity.Three inorganic salts were arranged according to their influence on gelation system in following order： CaCl2MgCl2NaCl.When the pH value of gelation system was between 9 and 10,the gelation time was the shortest.The research provided theoretical basis and technical support for in-depth fluid diverting in polymer flooding of offshore oilfield.