抄録
Effects on flow behavior, viscous fingering in this study, were experimentally investigated of change in rheological property of water soluble polyacrylamide (PAM) solution induced by addition of electrolyte Fe^<3+> Addition of Fe^<3+> scarcely changes rheological property. Injection of Fe^<3+> solution, however, significantly changes viscous fingering pattern in the PAM solution. Measurement of torque required at a constant revolution to agitate PAM solution during addition of Fe^<3+> solution suggests that this significant change in viscous fingering pattern is due to weak chemical bonding produced by chemical reaction between PAM solution and Fe^<3+> solution which can be destroyed by mechanical shearing.
