关键词: FPS-B剂, 增黏耐盐性, 流变性, 黏弹性, 驱油效果

Abstract:

Microcosmic characteristics of the type-B functional polymer surfactant (FPS-B) agent in solution were examined by scanning electronic microscopy. The effect of the FPS-B agent in different mass concentrations on its rheological behavior, viscoelasticity and displacement was studied through steady and dynamic shear experiments and physical simulation of flooding. The results showed that compared with other macromolecular polymers in the same mass concentration, the FPS-B agent is better both in increasing viscosity and salt endurance and in rheological behavior and viscoelasticity. Moreover, the higher the mass concentration of the FPS-B agent, the greater the loss and storage modulus of the solution, and the modulus curves are intersected. When the shear rate is lower than that of the intersection, the storage modulus of solution exceeds the loss modulus; on the contrary, the storage modulus of solution is lower than the loss modulus. The cause of this chemical phenomenon was analyzed in terms of molecular structures and nature. Displacement experiments on cores have confirmed that the goal may be achieved by using the FPS-B agent to enhance sweep efficiency and oil recovery as well.

Key words: FPS-B agent, increasing viscosity and salt endurance, rheological behavior, viscoelasticity, oil displacement efficiency