Abstract:

Time-dependent characteristics of the have been found experimentally. It can be residual resistance factor (FRR) visualized as an additional residual effect (FARE) produced by the retained polymer molecules while of the injection water is changed. And the additional residual the flow-rate effect factor (FARE) has been defined. Theoretical analyses based on comformation changes of the polymer molecules in a varying flow field indicate that polymer viscoelastic property is essentially responsible for this effect.