多孔介质中交联聚合物溶液动态成胶行为及机制研究

The crosslinked polymer gel for conformance control technology is an important technology for controlling water production and improving water flooding efficiency in many mature oilfields. However, the dynamic gelation behavior of crosslinked polymer solution in porous media is crucial to the success rate of polymer gel treatments. The key issues associated with dynamic gelation behavior are studied in this project. Based on long sand pack flow experiment and theoretical analysis methods, the dynamic gelation boundary of crosslinked polymer solution in porous media is determined. The relationship between effective plugging distance and the permeability of porous media is established. Moreover, the change of morphology characteristics of gel molecular aggregation and gel morphology after gelation under dynamic shear conditions are studied by means of rheometer, scanning electron microscopy (SEM) and atomic force microscope (AFM) detection instrument. Combined with the gel microstructures of different location, the gelation and plugging mechanism of crosslinked polymer solution are revealed, which will provide theoretical basis to design reasonable injection velocity and effective plugging distance for conformance control application of crosslinked polymer solution.

交联聚合物调剖是严重非均质油藏控水稳油、改善水驱提高采收率的重要技术手段。然而，该技术成功应用的关键在于交联聚合物溶液在油藏多孔介质中动态成胶性能。本项目针对交联聚合物溶液在多孔介质动态成胶中的关键问题，基于长填砂管岩心流动实验和理论分析方法，确定交联聚合物溶液在多孔介质中的动态成胶界限，建立交联聚合物溶液运移封堵的有效作用距离与多孔介质渗透率关系。同时，借助流变仪、扫描电镜和原子力显微镜仪器检测分析手段，探究动态剪切条件下交联聚合物溶液交联反应过程中冻胶分子聚集体形态及成胶后微观形态结构变化特征，再结合多孔介质中成胶后不同位置处的冻胶微观形态结构表征，揭示交联聚合物溶液在多孔介质中的动态成胶和封堵机制，为交联聚合物溶液调剖设计合理注入速度、封堵的有效作用距离提供理论依据。

交联聚合物调剖是严重非均质油藏控水稳油、改善水驱提高采收率的重要技术手段。然而，该技术成功应用的关键在于交联聚合物溶液在油藏多孔介质中动态成胶性能。本项目针对交联聚合物溶液在多孔介质动态成胶中的关键问题，以酚醛树脂冻胶为研究对象，研究了组分浓度对酚醛树脂冻胶在安瓿瓶和多孔介质中静态成胶影响，建立了多孔介质中和安瓿瓶中的静态成胶时间关系，为酚醛树脂冻胶调剖确定合理关井时间提供依据。基于长填砂管岩心流动实验和理论分析方法，研究了孔介质渗透率和注入速度对酚醛树脂冻胶在多孔介质中动态成胶性能影响规律研究，建立了酚醛树脂冻胶在多孔介质中动态成胶界限，确定了不同渗透率地层临界成胶注入线速度。建立了不同多孔介质渗透率条件下酚醛树脂冻胶运移封堵的有效作用距离关系。借助流变仪和扫描电镜检测分析手段，研究了动态剪切条件下不同剪切速率对酚醛树脂冻胶成胶性能影响及成胶后微观形态结构，再结合多孔介质中成胶后不同位置处的冻胶微观形态结构表征，揭示酚醛树脂冻胶溶液在多孔介质中的动态成胶和封堵机制。本项目的研究成果将为交联聚合物溶液调剖设计合理注入速度、封堵的有效作用距离提供理论依据。