Ionic liquids (ILs) have found their application as novel green surfactants in different chemical industries. These ILs are emerging as a substitute for the surfactants employed in petroleum industries. The quest for a reliable surface-active agent for enhanced oil recovery application has led to the investigation of polymeric ionic liquid as chemical agents. Poly-ionic liquids (PILs) are unique compounds that possess distinctive properties of ILs such as, thermal stability and salt tolerance, along with the specific property of polymers such as flexibility and durability of the polymeric backbone. In present work, poly [1-hexadecyl-3-vinyl-imidazolium bromide] (poly [C₁₆VI_m⁺][Br⁻]) was synthesized and investigated as a chemical agent for enhanced oil recovery. The interaction of PIL with aqueous injection fluids and crude oil has been analyzed by different properties such as interfacial tension, wettability alteration, dynamic light scattering (DLS), and rheological parameters, which help in understanding the performance of IL flooding. Surface tensiometry studies revealed the critical micellar concentration (CMC) of PIL to be much lower (200 ppm) in comparison to analogous ILs. The synthesized poly-ionic liquid showed good salt tolerance behavior (>10%) and long-term thermal stability (90 °C) in the presence of monovalent and divalent ions, thus confirming its applicability in the high saline reservoir. Highly beneficial low interfacial tension (IFT) values were obtained at crude oil-aqueous interfaces, which further decreased with an increase in salinity and temperature. DLS studies revealed that hydrodynamic particle size of PIL at CMC to be ~180 nm and it increased with concentration due to aggregation of molecules. PIL showed pseudoplastic or shear-thinning behavior, and viscosity increased with concentration due to the formation of transient network and entanglement of molecules. Contact angle studies showed that poly [C₁₆VI_m⁺][Br⁻] aqueous solution alters the wetting characteristics of rock from intermediate-wet to water-wet condition (below 20°). Analyzing the above properties, core-flooding experiments were conducted, and additional oil recovery of 31.25% of the original oil in place was obtained after the conventional water flooding.

离子液体（IL）已在不同的化学工业中用作新型绿色表面活性剂。这些IL正在代替石油工业中使用的表面活性剂。对用于提高采油率应用的可靠表面活性剂的追求导致对作为化学试剂的聚合物离子液体的研究。聚离子液体（PIL）是独特的化合物，具有IL的独特特性，例如热稳定性和耐盐性，以及聚合物的特定特性，例如聚合物骨架的柔韧性和耐久性。在目前的工作中，聚[1-十六烷基-3-乙烯基咪唑鎓溴化物]（聚[C ₁₆ VI_米⁺ ] [BR ^-]）被合成并作为提高采油率的化学试剂进行了研究。通过界面张力，润湿性变化，动态光散射（DLS）和流变参数等不同特性分析了PIL与含水注射液和原油之间的相互作用，这有助于理解IL驱的性能。表面张力测量研究表明，与类似的IL相比，PIL的临界胶束浓度（CMC）更低（200 ppm）。合成的聚离子液体在单价和二价离子存在下表现出良好的耐盐性能（> 10％）和长期热稳定性（90°C），从而证实了其在高盐储层中的适用性。在原油-水界面处获得了非常有益的低界面张力（IFT）值，随着盐度和温度的升高而进一步降低。DLS研究表明，CMC上PIL的流体动力学粒度为〜180 nm，并且由于分子聚集而随浓度增加。PIL表现出假塑性或剪切稀化行为，并且由于瞬态网络的形成和分子的缠结，粘度随浓度而增加。接触角研究表明，聚[C₁₆ VI_米⁺ ] [BR ^- ]水溶液涂改岩石从中间湿水湿条件（低于20℃）的润湿特性。分析上述性质，进行了岩心驱油实验，在常规注水后，又获得了31.25％的原始油采收率。