聚–表二元驱油体系性能对比研究

Comparative Study For The Properties Of Different Surfactant/Polymer Binary Flooding Systems

基于不同分子结构,探讨了表面活性剂分子与聚合物分子、高价金属离子的相互作用机理,认为与钙离子结合能力排序为:十二烷基硫酸钠>部分水解聚丙烯酰胺>十二烷基苯磺酸钠,从而导致聚–表二元复配体系黏度的差异。同时,驱油体系驱油实验的结果表明,驱油效率主要受到体系黏度、油水界面张力的影响,但驱油体系性能相近的情况下,具有更大分子截面积的表面活性剂,在驱替过程中,会表现出较好的界面张力保持能力,得到相对较高的驱油效率。

Based on the different molecular structures, interaction mechanisms of surfactant interaction with polymer and high-valent metal ions were discussed. The bonding ability of calcium ions ranks as SDS 〉 HPAM 〉SDBS, which xesults in the different viscosities of surfactant/polymer binary systems. Experiments show that oil displacement efficiency was mainly influenced by their viscosity and interfacial tension. However, for similar property systems, the surfactant with bigger molecular surface cross-sectional area is more helpful to enhance oil displacement efficiency. To some extent, such surfactant would maintain original interfacial tension while flooding.