高钙镁油藏悬浮微晶聚合物体系研究

Study on suspended microcrystalline polymer flooding system in high calcium-magnesium reservoir

为了解决高钙镁油藏聚丙烯酰胺类聚合物抗盐性能差、无法开展聚合物驱现场应用的问题。悬浮微晶聚合物体系通过自研的增黏剂将水中钙镁离子变成微晶,从而使注入水的高浓度钙镁离子变害为利,大幅度提高了聚合物溶液抗钙镁、增黏的性能。研究表明:悬浮微晶聚合物体系具有良好的增黏性,其黏度是相同浓度聚合物溶液黏度的3.1~4.0倍。悬浮微晶聚合物体系中分散剂最佳浓度为0.2%,成晶剂最佳浓度为0.3%。聚合物优选疏水缔合型聚丙烯酰胺类聚合物。悬浮微晶聚合物体系在高钙镁油藏具有良好的应用潜力。

Due to the poor salt resistance of polyacrylamide polymers,the technology of polymer flooding for enhanced oil recovery in high calcium and magnesium reservoirs is limited.By introducing the suspended microcrystalline polymer system,it becomes beneficial for the injection of water containing the high-concentration calcium and magnesium ions.The self-developed tackifier turns the calcium and magnesium ions into microcrystals,and associates the microcrystals with polymer molecules to form a local network.The structure of the three-dimensional macromolecules has the properties of anti-calcium and magnesium,thickening,and the increased viscosity of the polymer solution.The optimum concentration of dispersant and crystallization agent in suspended microcrystalline polymer system is 0.2%and 0.3%,respectively.The polymer is preferably hydrophobic associative polyacrylamide polymer.